skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Role of pendant proton relays and proton-coupled electron transfer on the hydrogen evolution reaction by nickel hangman porphyrins

Abstract

Here, the hangman motif provides mechanistic insights into the role of pendant proton relays in governing proton-coupled electron transfer (PCET) involved in the hydrogen evolution reaction (HER). We now show improved HER activity of Ni compared with Co hangman porphyrins. Cyclic voltammogram data and simulations, together with computational studies using density functional theory, implicate a shift in electrokinetic zone between Co and Ni hangman porphyrins due to a change in the PCET mechanism. Unlike the Co hangman porphyrin, the Ni hangman porphyrin does not require reduction to the formally metal(0) species before protonation by weak acids in acetonitrile. We conclude that protonation likely occurs at the Ni(I) state followed by reduction, in a stepwise proton transfer–electron transfer pathway. Spectroelectrochemical and computational studies reveal that upon reduction of the Ni(II) compound, the first electron is transferred to a metal-based orbital, whereas the second electron is transferred to a molecular orbital on the porphyrin ring.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Harvard Univ., Cambridge, MA (United States)
  2. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Publication Date:
Research Org.:
Harvard Univ., Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1348826
Grant/Contract Number:  
SC0009758
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 111; Journal Issue: 42; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; renewable; solar fuels; electrocatalysis

Citation Formats

Bediako, D. Kwabena, Solis, Brian H., Dogutan, Dilek K., Roubelakis, Manolis M., Maher, Andrew G., Lee, Chang Hoon, Chambers, Matthew B., Hammes-Schiffer, Sharon, and Nocera, Daniel G. Role of pendant proton relays and proton-coupled electron transfer on the hydrogen evolution reaction by nickel hangman porphyrins. United States: N. p., 2014. Web. doi:10.1073/pnas.1414908111.
Bediako, D. Kwabena, Solis, Brian H., Dogutan, Dilek K., Roubelakis, Manolis M., Maher, Andrew G., Lee, Chang Hoon, Chambers, Matthew B., Hammes-Schiffer, Sharon, & Nocera, Daniel G. Role of pendant proton relays and proton-coupled electron transfer on the hydrogen evolution reaction by nickel hangman porphyrins. United States. doi:10.1073/pnas.1414908111.
Bediako, D. Kwabena, Solis, Brian H., Dogutan, Dilek K., Roubelakis, Manolis M., Maher, Andrew G., Lee, Chang Hoon, Chambers, Matthew B., Hammes-Schiffer, Sharon, and Nocera, Daniel G. Wed . "Role of pendant proton relays and proton-coupled electron transfer on the hydrogen evolution reaction by nickel hangman porphyrins". United States. doi:10.1073/pnas.1414908111. https://www.osti.gov/servlets/purl/1348826.
@article{osti_1348826,
title = {Role of pendant proton relays and proton-coupled electron transfer on the hydrogen evolution reaction by nickel hangman porphyrins},
author = {Bediako, D. Kwabena and Solis, Brian H. and Dogutan, Dilek K. and Roubelakis, Manolis M. and Maher, Andrew G. and Lee, Chang Hoon and Chambers, Matthew B. and Hammes-Schiffer, Sharon and Nocera, Daniel G.},
abstractNote = {Here, the hangman motif provides mechanistic insights into the role of pendant proton relays in governing proton-coupled electron transfer (PCET) involved in the hydrogen evolution reaction (HER). We now show improved HER activity of Ni compared with Co hangman porphyrins. Cyclic voltammogram data and simulations, together with computational studies using density functional theory, implicate a shift in electrokinetic zone between Co and Ni hangman porphyrins due to a change in the PCET mechanism. Unlike the Co hangman porphyrin, the Ni hangman porphyrin does not require reduction to the formally metal(0) species before protonation by weak acids in acetonitrile. We conclude that protonation likely occurs at the Ni(I) state followed by reduction, in a stepwise proton transfer–electron transfer pathway. Spectroelectrochemical and computational studies reveal that upon reduction of the Ni(II) compound, the first electron is transferred to a metal-based orbital, whereas the second electron is transferred to a molecular orbital on the porphyrin ring.},
doi = {10.1073/pnas.1414908111},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 42,
volume = 111,
place = {United States},
year = {2014},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 35 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: Crystal structure of 1-Ni with thermal ellipsoids set at 50% probability. Selected internuclear distances (Å) and angles (°): Ni(1)−N(1) 1.951(3), Ni(1)−N(2) 1.940(3), Ni(1)−N(3) 1.951(3), Ni(1)−N(4) 1.951(3), Ni(1)−O(1) 4.510(6), N(1)−Ni(1)−N2 89.83(12), N(1)−Ni(1)−N(4) 90.31(12), N(2)−Ni(1)− N(3) 90.06(12), N(3)−Ni(1)−N(4) 89.87(13).

Save / Share:

Works referenced in this record:

Electrochemical Approach to the Mechanistic Study of Proton-Coupled Electron Transfer
journal, July 2008


Proton-coupled electron transfer: classification scheme and guide to theoretical methods
journal, January 2012

  • Hammes-Schiffer, Sharon
  • Energy & Environmental Science, Vol. 5, Issue 7
  • DOI: 10.1039/c2ee03361e

Electocatalytic Water Oxidation by Cobalt(III) Hangman β-Octafluoro Corroles
journal, June 2011

  • Dogutan, Dilek K.; McGuire, Robert; Nocera, Daniel G.
  • Journal of the American Chemical Society, Vol. 133, Issue 24
  • DOI: 10.1021/ja202138m

Substituent Effects on Cobalt Diglyoxime Catalysts for Hydrogen Evolution
journal, November 2011

  • Solis, Brian H.; Hammes-Schiffer, Sharon
  • Journal of the American Chemical Society, Vol. 133, Issue 47
  • DOI: 10.1021/ja208091e

Molecular Catalysis of Electrochemical Reactions. Mechanistic Aspects
journal, July 2008

  • Savéant, Jean-Michel
  • Chemical Reviews, Vol. 108, Issue 7, p. 2348-2378
  • DOI: 10.1021/cr068079z

Theoretical studies of the mechanism of catalytic hydrogen production by a cobaloxime
journal, January 2011

  • Muckerman, James T.; Fujita, Etsuko
  • Chemical Communications, Vol. 47, Issue 46
  • DOI: 10.1039/c1cc15330g

A survey of Hammett substituent constants and resonance and field parameters
journal, March 1991

  • Hansch, Corwin.; Leo, A.; Taft, R. W.
  • Chemical Reviews, Vol. 91, Issue 2
  • DOI: 10.1021/cr00002a004

Powering the planet: Chemical challenges in solar energy utilization
journal, October 2006

  • Lewis, N. S.; Nocera, D. G.
  • Proceedings of the National Academy of Sciences, Vol. 103, Issue 43, p. 15729-15735
  • DOI: 10.1073/pnas.0603395103

Oxygen reduction reactivity of cobalt(ii) hangman porphyrins
journal, January 2010

  • McGuire Jr., Robert; Dogutan, Dilek K.; Teets, Thomas S.
  • Chemical Science, Vol. 1, Issue 3
  • DOI: 10.1039/c0sc00281j

Electroreduction of carbon monoxide to liquid fuel on oxide-derived nanocrystalline copper
journal, April 2014

  • Li, Christina W.; Ciston, Jim; Kanan, Matthew W.
  • Nature, Vol. 508, Issue 7497
  • DOI: 10.1038/nature13249

Concerted proton-coupled electron transfers in aquo/hydroxo/oxo metal complexes: Electrochemistry of [OsII(bpy)2py(OH2)]2+ in water
journal, July 2009

  • Costentin, C.; Robert, M.; Saveant, J. -M.
  • Proceedings of the National Academy of Sciences, Vol. 106, Issue 29
  • DOI: 10.1073/pnas.0905020106

Role of Proton-Coupled Electron Transfer in O–O Bond Activation
journal, July 2007

  • Rosenthal, Joel; Nocera, Daniel G.
  • Accounts of Chemical Research, Vol. 40, Issue 7
  • DOI: 10.1021/ar7000638

Proton-coupled electron transfer kinetics for the hydrogen evolution reaction of hangman porphyrins
journal, January 2012

  • Roubelakis, Manolis M.; Bediako, D. Kwabena; Dogutan, Dilek K.
  • Energy & Environmental Science, Vol. 5, Issue 7
  • DOI: 10.1039/c2ee21123h

Coupled electron transfers in artificial photosynthesis
journal, October 2007

  • Hammarström, Leif; Styring, Stenbjörn
  • Philosophical Transactions of the Royal Society B: Biological Sciences, Vol. 363, Issue 1494
  • DOI: 10.1098/rstb.2007.2225

Electrocatalytic Oxygen Reduction by Iron Tetra-arylporphyrins Bearing Pendant Proton Relays
journal, March 2012

  • Carver, Colin T.; Matson, Benjamin D.; Mayer, James M.
  • Journal of the American Chemical Society, Vol. 134, Issue 12
  • DOI: 10.1021/ja211987f

Porphyrin Architectures Bearing Functionalized Xanthene Spacers
journal, February 2002

  • Chang, Christopher J.; Yeh, Chen-Yu; Nocera, Daniel G.
  • The Journal of Organic Chemistry, Vol. 67, Issue 4
  • DOI: 10.1021/jo016095k

Photosynthetic energy conversion: natural and artificial
journal, January 2009


Manganese as a Substitute for Rhenium in CO 2 Reduction Catalysts: The Importance of Acids
journal, February 2013

  • Smieja, Jonathan M.; Sampson, Matthew D.; Grice, Kyle A.
  • Inorganic Chemistry, Vol. 52, Issue 5
  • DOI: 10.1021/ic302391u

Hydrogen Generation by Hangman Metalloporphyrins
journal, June 2011

  • Lee, Chang Hoon; Dogutan, Dilek K.; Nocera, Daniel G.
  • Journal of the American Chemical Society, Vol. 133, Issue 23
  • DOI: 10.1021/ja202136y

A Synthetic Nickel Electrocatalyst with a Turnover Frequency Above 100,000 s-1 for H2 Production
journal, August 2011

  • Helm, M. L.; Stewart, M. P.; Bullock, R. M.
  • Science, Vol. 333, Issue 6044, p. 863-866
  • DOI: 10.1126/science.1205864

Proton-Coupled Electron Transfer in Biology: Results from Synergistic Studies in Natural and Model Systems
journal, June 2009


Proton-Coupled Electron Transfer
journal, November 2007

  • Huynh, My Hang V.; Meyer, Thomas J.
  • Chemical Reviews, Vol. 107, Issue 11
  • DOI: 10.1021/cr0500030

Two Pathways for Electrocatalytic Oxidation of Hydrogen by a Nickel Bis(diphosphine) Complex with Pendant Amines in the Second Coordination Sphere
journal, June 2013

  • Yang, Jenny Y.; Smith, Stuart E.; Liu, Tianbiao
  • Journal of the American Chemical Society, Vol. 135, Issue 26
  • DOI: 10.1021/ja400705a

Keeping the Energy Debate Clean: How Do We Supply the World's Energy Needs?
journal, January 2010


Reversible Electrocatalytic Production and Oxidation of Hydrogen at Low Overpotentials by a Functional Hydrogenase Mimic
journal, February 2012

  • Smith, Stuart E.; Yang, Jenny Y.; DuBois, Daniel L.
  • Angewandte Chemie International Edition, Vol. 51, Issue 13, p. 3152-3155
  • DOI: 10.1002/anie.201108461

Does one-electron transfer to nickel(II) porphyrins involve the metal or the porphyrin ligand?
journal, January 1989

  • Lexa, Doris; Momenteau, Michel; Mispelter, Joel
  • Inorganic Chemistry, Vol. 28, Issue 1
  • DOI: 10.1021/ic00300a009

Efficient Synthesis of Hangman Porphyrins
journal, March 2010

  • Dogutan, Dilek K.; Bediako, D. Kwabena; Teets, Thomas S.
  • Organic Letters, Vol. 12, Issue 5
  • DOI: 10.1021/ol902947h

Digital simulations on unequally spaced grids.
journal, February 2003


Theory of Coupled Electron and Proton Transfer Reactions
journal, December 2010

  • Hammes-Schiffer, Sharon; Stuchebrukhov, Alexei A.
  • Chemical Reviews, Vol. 110, Issue 12
  • DOI: 10.1021/cr1001436

Energy implications of future stabilization of atmospheric CO2 content
journal, October 1998

  • Hoffert, Martin I.; Caldeira, Ken; Jain, Atul K.
  • Nature, Vol. 395, Issue 6705
  • DOI: 10.1038/27638

Proton-Directed Redox Control of O−O Bond Activation by Heme Hydroperoxidase Models
journal, April 2007

  • Soper, Jake D.; Kryatov, Sergey V.; Rybak-Akimova, Elena V.
  • Journal of the American Chemical Society, Vol. 129, Issue 16
  • DOI: 10.1021/ja0683032

Opportunities and challenges for a sustainable energy future
journal, August 2012

  • Chu, Steven; Majumdar, Arun
  • Nature, Vol. 488, Issue 7411, p. 294-303
  • DOI: 10.1038/nature11475

Proton-Coupled Electron Transfer
journal, October 1998


Solar Energy Supply and Storage for the Legacy and Nonlegacy Worlds
journal, November 2010

  • Cook, Timothy R.; Dogutan, Dilek K.; Reece, Steven Y.
  • Chemical Reviews, Vol. 110, Issue 11
  • DOI: 10.1021/cr100246c

Proton-Coupled O−O Activation on a Redox Platform Bearing a Hydrogen-Bonding Scaffold
journal, February 2003

  • Chang, Christopher J.; Chng, Leng Leng; Nocera, Daniel G.
  • Journal of the American Chemical Society, Vol. 125, Issue 7
  • DOI: 10.1021/ja028548o

Chemistry of Personalized Solar Energy
journal, November 2009


Efficient Reduction of CO 2 to CO with High Current Density Using in Situ or ex Situ Prepared Bi-Based Materials
journal, May 2014

  • Medina-Ramos, Jonnathan; DiMeglio, John L.; Rosenthal, Joel
  • Journal of the American Chemical Society, Vol. 136, Issue 23
  • DOI: 10.1021/ja501923g

Hydrogen-Bond Relays in Concerted Proton–Electron Transfers
journal, October 2011

  • Bonin, Julien; Costentin, Cyrille; Robert, Marc
  • Accounts of Chemical Research, Vol. 45, Issue 3
  • DOI: 10.1021/ar200132f

Mechanisms of Water Oxidation from the Blue Dimer to Photosystem II
journal, March 2008

  • Liu, Feng; Concepcion, Javier J.; Jurss, Jonah W.
  • Inorganic Chemistry, Vol. 47, Issue 6
  • DOI: 10.1021/ic701249s

PROTON-COUPLED ELECTRON TRANSFER: A Reaction Chemist's View
journal, June 2004


A Synthetic Nickel Electrocatalyst with a Turnover Frequency above 100 000 s−1 for H2 Production
journal, November 2011


Digital simulations on unequally spaced grids.
journal, July 2002


    Works referencing / citing this record:

    Reversible Electrocatalytic Production and Oxidation of Hydrogen at Low Overpotentials by a Functional Hydrogenase Mimic
    journal, February 2012

    • Smith, Stuart E.; Yang, Jenny Y.; DuBois, Daniel L.
    • Angewandte Chemie International Edition, Vol. 51, Issue 13, p. 3152-3155
    • DOI: 10.1002/anie.201108461

    Singly versus Doubly Reduced Nickel Porphyrins for Proton Reduction: Experimental and Theoretical Evidence for a Homolytic Hydrogen-Evolution Reaction
    journal, March 2016

    • Han, Yongzhen; Fang, Huayi; Jing, Huize
    • Angewandte Chemie International Edition, Vol. 55, Issue 18
    • DOI: 10.1002/anie.201510001

    Hydrogen-Bond Relays in Concerted Proton–Electron Transfers
    journal, October 2011

    • Bonin, Julien; Costentin, Cyrille; Robert, Marc
    • Accounts of Chemical Research, Vol. 45, Issue 3
    • DOI: 10.1021/ar200132f

    Role of Proton-Coupled Electron Transfer in O–O Bond Activation
    journal, July 2007

    • Rosenthal, Joel; Nocera, Daniel G.
    • Accounts of Chemical Research, Vol. 40, Issue 7
    • DOI: 10.1021/ar7000638

    A survey of Hammett substituent constants and resonance and field parameters
    journal, March 1991

    • Hansch, Corwin.; Leo, A.; Taft, R. W.
    • Chemical Reviews, Vol. 91, Issue 2
    • DOI: 10.1021/cr00002a004

    Proton-Coupled Electron Transfer
    journal, November 2007

    • Huynh, My Hang V.; Meyer, Thomas J.
    • Chemical Reviews, Vol. 107, Issue 11
    • DOI: 10.1021/cr0500030

    Electrochemical Approach to the Mechanistic Study of Proton-Coupled Electron Transfer
    journal, July 2008


    Molecular Catalysis of Electrochemical Reactions. Mechanistic Aspects
    journal, July 2008

    • Savéant, Jean-Michel
    • Chemical Reviews, Vol. 108, Issue 7, p. 2348-2378
    • DOI: 10.1021/cr068079z

    Theory of Coupled Electron and Proton Transfer Reactions
    journal, December 2010

    • Hammes-Schiffer, Sharon; Stuchebrukhov, Alexei A.
    • Chemical Reviews, Vol. 110, Issue 12
    • DOI: 10.1021/cr1001436

    Solar Energy Supply and Storage for the Legacy and Nonlegacy Worlds
    journal, November 2010

    • Cook, Timothy R.; Dogutan, Dilek K.; Reece, Steven Y.
    • Chemical Reviews, Vol. 110, Issue 11
    • DOI: 10.1021/cr100246c

    Does one-electron transfer to nickel(II) porphyrins involve the metal or the porphyrin ligand?
    journal, January 1989

    • Lexa, Doris; Momenteau, Michel; Mispelter, Joel
    • Inorganic Chemistry, Vol. 28, Issue 1
    • DOI: 10.1021/ic00300a009

    Manganese as a Substitute for Rhenium in CO 2 Reduction Catalysts: The Importance of Acids
    journal, February 2013

    • Smieja, Jonathan M.; Sampson, Matthew D.; Grice, Kyle A.
    • Inorganic Chemistry, Vol. 52, Issue 5
    • DOI: 10.1021/ic302391u

    Mechanisms of Water Oxidation from the Blue Dimer to Photosystem II
    journal, March 2008

    • Liu, Feng; Concepcion, Javier J.; Jurss, Jonah W.
    • Inorganic Chemistry, Vol. 47, Issue 6
    • DOI: 10.1021/ic701249s

    Chemistry of Personalized Solar Energy
    journal, November 2009


    Proton-Coupled O−O Activation on a Redox Platform Bearing a Hydrogen-Bonding Scaffold
    journal, February 2003

    • Chang, Christopher J.; Chng, Leng Leng; Nocera, Daniel G.
    • Journal of the American Chemical Society, Vol. 125, Issue 7
    • DOI: 10.1021/ja028548o

    Proton-Directed Redox Control of O−O Bond Activation by Heme Hydroperoxidase Models
    journal, April 2007

    • Soper, Jake D.; Kryatov, Sergey V.; Rybak-Akimova, Elena V.
    • Journal of the American Chemical Society, Vol. 129, Issue 16
    • DOI: 10.1021/ja0683032

    Hydrogen Generation by Hangman Metalloporphyrins
    journal, June 2011

    • Lee, Chang Hoon; Dogutan, Dilek K.; Nocera, Daniel G.
    • Journal of the American Chemical Society, Vol. 133, Issue 23
    • DOI: 10.1021/ja202136y

    Electocatalytic Water Oxidation by Cobalt(III) Hangman β-Octafluoro Corroles
    journal, June 2011

    • Dogutan, Dilek K.; McGuire, Robert; Nocera, Daniel G.
    • Journal of the American Chemical Society, Vol. 133, Issue 24
    • DOI: 10.1021/ja202138m

    Substituent Effects on Cobalt Diglyoxime Catalysts for Hydrogen Evolution
    journal, November 2011

    • Solis, Brian H.; Hammes-Schiffer, Sharon
    • Journal of the American Chemical Society, Vol. 133, Issue 47
    • DOI: 10.1021/ja208091e

    Electrocatalytic Oxygen Reduction by Iron Tetra-arylporphyrins Bearing Pendant Proton Relays
    journal, March 2012

    • Carver, Colin T.; Matson, Benjamin D.; Mayer, James M.
    • Journal of the American Chemical Society, Vol. 134, Issue 12
    • DOI: 10.1021/ja211987f

    Two Pathways for Electrocatalytic Oxidation of Hydrogen by a Nickel Bis(diphosphine) Complex with Pendant Amines in the Second Coordination Sphere
    journal, June 2013

    • Yang, Jenny Y.; Smith, Stuart E.; Liu, Tianbiao
    • Journal of the American Chemical Society, Vol. 135, Issue 26
    • DOI: 10.1021/ja400705a

    Efficient Reduction of CO 2 to CO with High Current Density Using in Situ or ex Situ Prepared Bi-Based Materials
    journal, May 2014

    • Medina-Ramos, Jonnathan; DiMeglio, John L.; Rosenthal, Joel
    • Journal of the American Chemical Society, Vol. 136, Issue 23
    • DOI: 10.1021/ja501923g

    Porphyrin Architectures Bearing Functionalized Xanthene Spacers
    journal, February 2002

    • Chang, Christopher J.; Yeh, Chen-Yu; Nocera, Daniel G.
    • The Journal of Organic Chemistry, Vol. 67, Issue 4
    • DOI: 10.1021/jo016095k

    Efficient Synthesis of Hangman Porphyrins
    journal, March 2010

    • Dogutan, Dilek K.; Bediako, D. Kwabena; Teets, Thomas S.
    • Organic Letters, Vol. 12, Issue 5
    • DOI: 10.1021/ol902947h

    Energy implications of future stabilization of atmospheric CO2 content
    journal, October 1998

    • Hoffert, Martin I.; Caldeira, Ken; Jain, Atul K.
    • Nature, Vol. 395, Issue 6705
    • DOI: 10.1038/27638

    Opportunities and challenges for a sustainable energy future
    journal, August 2012

    • Chu, Steven; Majumdar, Arun
    • Nature, Vol. 488, Issue 7411, p. 294-303
    • DOI: 10.1038/nature11475

    Electroreduction of carbon monoxide to liquid fuel on oxide-derived nanocrystalline copper
    journal, April 2014

    • Li, Christina W.; Ciston, Jim; Kanan, Matthew W.
    • Nature, Vol. 508, Issue 7497
    • DOI: 10.1038/nature13249

    Accelerating proton-coupled electron transfer of metal hydrides in catalyst model reactions
    journal, July 2018


    Photosynthetic energy conversion: natural and artificial
    journal, January 2009


    Oxygen reduction reactivity of cobalt(ii) hangman porphyrins
    journal, January 2010

    • McGuire Jr., Robert; Dogutan, Dilek K.; Teets, Thomas S.
    • Chemical Science, Vol. 1, Issue 3
    • DOI: 10.1039/c0sc00281j

    Theoretical studies of the mechanism of catalytic hydrogen production by a cobaloxime
    journal, January 2011

    • Muckerman, James T.; Fujita, Etsuko
    • Chemical Communications, Vol. 47, Issue 46
    • DOI: 10.1039/c1cc15330g

    Proton-coupled electron transfer: classification scheme and guide to theoretical methods
    journal, January 2012

    • Hammes-Schiffer, Sharon
    • Energy & Environmental Science, Vol. 5, Issue 7
    • DOI: 10.1039/c2ee03361e

    Proton-coupled electron transfer kinetics for the hydrogen evolution reaction of hangman porphyrins
    journal, January 2012

    • Roubelakis, Manolis M.; Bediako, D. Kwabena; Dogutan, Dilek K.
    • Energy & Environmental Science, Vol. 5, Issue 7
    • DOI: 10.1039/c2ee21123h

    A polypyridyl Co( ii ) complex-based water reduction catalyst with double H 2 evolution sites
    journal, January 2016

    • Wang, Junfei; Li, Chao; Zhou, Qianxiong
    • Catalysis Science & Technology, Vol. 6, Issue 24
    • DOI: 10.1039/c6cy01897a

    Proton switching as a driving force for the metal–organic complex-mediated growth of gold colloids
    journal, January 2016

    • Jacob, Geevarghese Vadakken; Sutradhar, Sanjeeb; Patnaik, Archita
    • New Journal of Chemistry, Vol. 40, Issue 9
    • DOI: 10.1039/c6nj01380e

    Cooperative water oxidation catalysis in a series of trinuclear metallosupramolecular ruthenium macrocycles
    journal, January 2017

    • Kunz, Valentin; Lindner, Joachim O.; Schulze, Marcus
    • Energy & Environmental Science, Vol. 10, Issue 10
    • DOI: 10.1039/c7ee01557g

    Enhancing the reactivity of nickel( ii ) in hydrogen evolution reactions (HERs) by β-hydrogenation of porphyrinoid ligands
    journal, January 2017

    • Wu, Zhuo-Yan; Wang, Teng; Meng, Yin-Shan
    • Chemical Science, Vol. 8, Issue 9
    • DOI: 10.1039/c7sc02073b

    Electrocatalytic hydrogen evolution with gallium hydride and ligand-centered reduction
    journal, January 2019

    • Wang, Ni; Lei, Haitao; Zhang, Zongyao
    • Chemical Science, Vol. 10, Issue 8
    • DOI: 10.1039/c8sc05247f

    Cobalt-based molecular electrocatalysis of nitrile reduction: evolving sustainability beyond hydrogen
    journal, January 2019

    • Child, Simon N.; Raychev, Radoslav; Moss, Nathan
    • Dalton Transactions, Vol. 48, Issue 26
    • DOI: 10.1039/c9dt00773c

    Powering the planet: Chemical challenges in solar energy utilization
    journal, October 2006

    • Lewis, N. S.; Nocera, D. G.
    • Proceedings of the National Academy of Sciences, Vol. 103, Issue 43, p. 15729-15735
    • DOI: 10.1073/pnas.0603395103

    Concerted proton-coupled electron transfers in aquo/hydroxo/oxo metal complexes: Electrochemistry of [OsII(bpy)2py(OH2)]2+ in water
    journal, July 2009

    • Costentin, C.; Robert, M.; Saveant, J. -M.
    • Proceedings of the National Academy of Sciences, Vol. 106, Issue 29
    • DOI: 10.1073/pnas.0905020106

    Coupled electron transfers in artificial photosynthesis
    journal, October 2007

    • Hammarström, Leif; Styring, Stenbjörn
    • Philosophical Transactions of the Royal Society B: Biological Sciences, Vol. 363, Issue 1494
    • DOI: 10.1098/rstb.2007.2225

    A Synthetic Nickel Electrocatalyst with a Turnover Frequency Above 100,000 s-1 for H2 Production
    journal, August 2011

    • Helm, M. L.; Stewart, M. P.; Bullock, R. M.
    • Science, Vol. 333, Issue 6044, p. 863-866
    • DOI: 10.1126/science.1205864

    Proton-Coupled Electron Transfer in Biology: Results from Synergistic Studies in Natural and Model Systems
    journal, June 2009


    Proton-Coupled Electron Transfer
    journal, October 1998


    PROTON-COUPLED ELECTRON TRANSFER: A Reaction Chemist's View
    journal, June 2004


    Proton-coupled electron transfer chemistry of hangman macrocycles: Hydrogen and oxygen evolution reactions
    journal, January 2015

    • Dogutan, Dilek K.; Bediako, D. Kwabena; Graham, Daniel J.
    • Journal of Porphyrins and Phthalocyanines, Vol. 19, Issue 01-03
    • DOI: 10.1142/s1088424614501016

    Accelerating proton-coupled electron transfer of metal hydrides in catalyst model reactions
    journal, July 2018


    A polypyridyl Co( ii ) complex-based water reduction catalyst with double H 2 evolution sites
    journal, January 2016

    • Wang, Junfei; Li, Chao; Zhou, Qianxiong
    • Catalysis Science & Technology, Vol. 6, Issue 24
    • DOI: 10.1039/c6cy01897a

    Proton switching as a driving force for the metal–organic complex-mediated growth of gold colloids
    journal, January 2016

    • Jacob, Geevarghese Vadakken; Sutradhar, Sanjeeb; Patnaik, Archita
    • New Journal of Chemistry, Vol. 40, Issue 9
    • DOI: 10.1039/c6nj01380e

    Cooperative water oxidation catalysis in a series of trinuclear metallosupramolecular ruthenium macrocycles
    journal, January 2017

    • Kunz, Valentin; Lindner, Joachim O.; Schulze, Marcus
    • Energy & Environmental Science, Vol. 10, Issue 10
    • DOI: 10.1039/c7ee01557g

    Enhancing the reactivity of nickel( ii ) in hydrogen evolution reactions (HERs) by β-hydrogenation of porphyrinoid ligands
    journal, January 2017

    • Wu, Zhuo-Yan; Wang, Teng; Meng, Yin-Shan
    • Chemical Science, Vol. 8, Issue 9
    • DOI: 10.1039/c7sc02073b

    Electrocatalytic hydrogen evolution with gallium hydride and ligand-centered reduction
    journal, January 2019

    • Wang, Ni; Lei, Haitao; Zhang, Zongyao
    • Chemical Science, Vol. 10, Issue 8
    • DOI: 10.1039/c8sc05247f

    Cobalt-based molecular electrocatalysis of nitrile reduction: evolving sustainability beyond hydrogen
    journal, January 2019

    • Child, Simon N.; Raychev, Radoslav; Moss, Nathan
    • Dalton Transactions, Vol. 48, Issue 26
    • DOI: 10.1039/c9dt00773c

    Proton-coupled electron transfer chemistry of hangman macrocycles: Hydrogen and oxygen evolution reactions
    journal, January 2015

    • Dogutan, Dilek K.; Bediako, D. Kwabena; Graham, Daniel J.
    • Journal of Porphyrins and Phthalocyanines, Vol. 19, Issue 01-03
    • DOI: 10.1142/s1088424614501016