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Title: Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction

Abstract

Transition metal phosphides exhibit high catalytic activity toward the electrochemical hydrogen-evolution reaction (HER) and resist chemical corrosion in acidic solutions. For example, an electrodeposited CoP catalyst exhibited an overpotential, η of -η < 100 mV at a current density of -10 mA cm-2 in 0.500 M H2SO4 (aq). To obtain a chemical description of the material as-prepared and also while effecting the HER in acidic media, such electrocatalyst films were investigated using Raman spectroscopy and X-ray absorption spectroscopy both ex situ as well as under in situ and operando conditions in 0.500 M H2SO4 (aq). Ex situ analysis using the tandem spectroscopies indicated the presence of multiple ordered and disordered phases that contained both near-zerovalent and oxidized Co species, in addition to reduced and oxygenated P species. Lastly, operando analysis indicated that the active electrocatalyst was primarily amorphous and predominantly consisted of near-zerovalent Co as well as reduced P.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3];  [4];  [5]; ORCiD logo [3];  [5]; ORCiD logo [6]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Engineering and Applied Sciences, Joint Center for Artificial Photosynthesis
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division
  5. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis
  6. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis; California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering; California Inst. of Technology (CalTech), Pasadena, CA (United States). Kavli Nanoscience Inst.; California Inst. of Technology (CalTech), Pasadena, CA (United States). Beckman Inst.
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH)
OSTI Identifier:
1398516
Grant/Contract Number:  
AC02-05CH11231; SC0004993; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 139; Journal Issue: 37; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Saadi, Fadl H., Carim, Azhar I., Drisdell, Walter S., Gul, Sheraz, Baricuatro, Jack H., Yano, Junko, Soriaga, Manuel P., and Lewis, Nathan S. Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction. United States: N. p., 2017. Web. doi:10.1021/jacs.7b07606.
Saadi, Fadl H., Carim, Azhar I., Drisdell, Walter S., Gul, Sheraz, Baricuatro, Jack H., Yano, Junko, Soriaga, Manuel P., & Lewis, Nathan S. Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction. United States. https://doi.org/10.1021/jacs.7b07606
Saadi, Fadl H., Carim, Azhar I., Drisdell, Walter S., Gul, Sheraz, Baricuatro, Jack H., Yano, Junko, Soriaga, Manuel P., and Lewis, Nathan S. Mon . "Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction". United States. https://doi.org/10.1021/jacs.7b07606. https://www.osti.gov/servlets/purl/1398516.
@article{osti_1398516,
title = {Operando Spectroscopic Analysis of CoP Films Electrocatalyzing the Hydrogen-Evolution Reaction},
author = {Saadi, Fadl H. and Carim, Azhar I. and Drisdell, Walter S. and Gul, Sheraz and Baricuatro, Jack H. and Yano, Junko and Soriaga, Manuel P. and Lewis, Nathan S.},
abstractNote = {Transition metal phosphides exhibit high catalytic activity toward the electrochemical hydrogen-evolution reaction (HER) and resist chemical corrosion in acidic solutions. For example, an electrodeposited CoP catalyst exhibited an overpotential, η of -η < 100 mV at a current density of -10 mA cm-2 in 0.500 M H2SO4 (aq). To obtain a chemical description of the material as-prepared and also while effecting the HER in acidic media, such electrocatalyst films were investigated using Raman spectroscopy and X-ray absorption spectroscopy both ex situ as well as under in situ and operando conditions in 0.500 M H2SO4 (aq). Ex situ analysis using the tandem spectroscopies indicated the presence of multiple ordered and disordered phases that contained both near-zerovalent and oxidized Co species, in addition to reduced and oxygenated P species. Lastly, operando analysis indicated that the active electrocatalyst was primarily amorphous and predominantly consisted of near-zerovalent Co as well as reduced P.},
doi = {10.1021/jacs.7b07606},
journal = {Journal of the American Chemical Society},
number = 37,
volume = 139,
place = {United States},
year = {Mon Aug 28 00:00:00 EDT 2017},
month = {Mon Aug 28 00:00:00 EDT 2017}
}

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