Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Monolayer Molecular Functionalization Enabled by Acid–Base Interaction for High-Performance Photochemical CO2 Reduction

Journal Article · · ACS Energy Letters

We report the development of a hybrid catalyst consisting of carbon nitride (CNx) and cobalt phthalocyanine tetracarboxylic acid (CoPc-COOH), which converts CO2 to CO with high reaction rate (1067 μmol/g·h) and high selectivity (over 98%), under simulated solar irradiation. The carboxylic acid substituents on the phthalocyanine ligands play a critical role as they bind to the amine groups of CNx to enable nearly ideal monolayer coverage of the molecular co-catalyst on the semiconductor surface and promote catalytic activity from the molecular complex. Specifically, the CNx/CoPc-COOH hybrid material achieves a reaction rate 16 times higher than a CNx material containing unsubstituted CoPc molecules. We further show that activation and deactivation of the CNx/CoPc-COOH composite, which are associated with the reduction and decomposition of CoPc-COOH, respectively, both proceed at a nearly constant rate regardless of the CO2 reduction reaction rate. Here, the decoupling of charge carrier injection and CO2 reduction catalysis has important mechanistic implications for future performance optimization and materials design of photocatalysts for CO2 reduction.

Research Organization:
Univ. of North Carolina, Chapel Hill, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0021173
OSTI ID:
1896501
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 7 Vol. 7; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (56)

Electrostatic Self-Assembly of Nanosized Carbon Nitride Nanosheet onto a Zirconium Metal-Organic Framework for Enhanced Photocatalytic CO 2 Reduction journal July 2015
Visible-Light-Driven CO 2 Reduction by Mesoporous Carbon Nitride Modified with Polymeric Cobalt Phthalocyanine journal July 2019
Rare‐Earth Single Erbium Atoms for Enhanced Photocatalytic CO 2 Reduction journal April 2020
Cobalt Phthalocyanine Immobilized on Graphene Oxide: An Efficient Visible-Active Catalyst for the Photoreduction of Carbon Dioxide journal April 2014
Layered Heterostructures of Ultrathin Polymeric Carbon Nitride and ZnIn 2 S 4 Nanosheets for Photocatalytic CO 2 Reduction journal October 2018
Heterogeneous Nature of Electrocatalytic CO/CO 2 Reduction by Cobalt Phthalocyanines journal July 2020
Co-porphyrin/carbon nitride hybrids for improved photocatalytic CO2 reduction under visible light journal January 2017
Porous nitrogen-rich g-C3N4 nanotubes for efficient photocatalytic CO2 reduction journal November 2019
Core-shell Ni/NiO grafted cobalt (II) complex: An efficient inorganic nanocomposite for photocatalytic reduction of CO2 under visible light irradiation journal February 2019
Recent advances in CdS-based photocatalysts for CO2 photocatalytic conversion journal August 2021
Highly improved photoreduction of carbon dioxide to methanol using cobalt phthalocyanine grafted to graphitic carbon nitride as photocatalyst under visible light irradiation journal May 2019
In situ preparation of polymeric cobalt phthalocyanine–decorated TiO2 nanorods for efficient photocatalytic CO2 reduction journal December 2021
Heterogeneous Molecular Catalysts of Metal Phthalocyanines for Electrochemical CO2 Reduction Reactions journal August 2021
Heterogenized Molecular Catalysts: Vibrational Sum-Frequency Spectroscopic, Electrochemical, and Theoretical Investigations journal May 2019
Cocatalysts for Selective Photoreduction of CO 2 into Solar Fuels journal January 2019
Effective Driving of Ag-Loaded and Al-Doped SrTiO3 under Irradiation at λ > 300 nm for the Photocatalytic Conversion of CO2 by H2O journal February 2020
Direct Z-Scheme WO3/Graphitic Carbon Nitride Nanocomposites for the Photoreduction of CO2 journal January 2020
Photocatalytic CO 2 Reduction to C2+ Products journal April 2020
Recent Advances in Heterogeneous Photocatalytic CO 2 Conversion to Solar Fuels journal October 2016
Boron Carbon Nitride Semiconductors Decorated with CdS Nanoparticles for Photocatalytic Reduction of CO 2 journal April 2018
Elucidating the Reactivity and Mechanism of CO 2 Electroreduction at Highly Dispersed Cobalt Phthalocyanine journal May 2018
Steric Modification of a Cobalt Phthalocyanine/Graphene Catalyst To Give Enhanced and Stable Electrochemical CO 2 Reduction to CO journal February 2019
Crystalline Carbon Nitride Supported Copper Single Atoms for Photocatalytic CO 2 Reduction with Nearly 100% CO Selectivity journal July 2020
Rare-Earth Single-Atom La–N Charge-Transfer Bridge on Carbon Nitride for Highly Efficient and Selective Photocatalytic CO 2 Reduction journal November 2020
UV Photostability of Metal Phthalocyanines in Organic Solvents journal August 2003
Solar-Driven Reduction of Aqueous Protons Coupled to Selective Alcohol Oxidation with a Carbon Nitride–Molecular Ni Catalyst System journal July 2016
Selective Photocatalytic CO 2 Reduction in Water through Anchoring of a Molecular Ni Catalyst on CdS Nanocrystals journal May 2017
Time-Resolved Spectroscopic Investigation of Charge Trapping in Carbon Nitrides Photocatalysts for Hydrogen Generation journal March 2017
Selective CO 2 Reduction Catalyzed by Single Cobalt Sites on Carbon Nitride under Visible-Light Irradiation journal October 2018
Electron Accumulation Induces Efficiency Bottleneck for Hydrogen Production in Carbon Nitride Photocatalysts journal June 2019
Improving Photocatalysis for the Reduction of CO 2 through Non-covalent Supramolecular Assembly journal September 2019
Efficient Visible-Light-Driven CO 2 Reduction by a Cobalt Molecular Catalyst Covalently Linked to Mesoporous Carbon Nitride journal March 2020
Synthesis of Spherical Carbon Nitride Nanostructures journal October 2001
Highly selective and active CO2 reduction electrocatalysts based on cobalt phthalocyanine/carbon nanotube hybrid structures journal March 2017
Modulating the mechanism of electrocatalytic CO2 reduction by cobalt phthalocyanine through polymer coordination and encapsulation journal April 2019
Rapid electron transfer via dynamic coordinative interaction boosts quantum efficiency for photocatalytic CO2 reduction journal July 2021
Selective visible-light-driven photocatalytic CO2 reduction to CH4 mediated by atomically thin CuIn5S8 layers journal July 2019
Facet-dependent active sites of a single Cu2O particle photocatalyst for CO2 reduction to methanol journal November 2019
Molecular engineering of dispersed nickel phthalocyanines on carbon nanotubes for selective CO2 reduction journal August 2020
Boron-doped nitrogen-deficient carbon nitride-based Z-scheme heterostructures for photocatalytic overall water splitting journal March 2021
Domino electroreduction of CO2 to methanol on a molecular catalyst journal November 2019
Photocatalytic water splitting with a quantum efficiency of almost unity journal May 2020
Filling metal–organic framework mesopores with TiO2 for CO2 photoreduction journal September 2020
Designing materials for electrochemical carbon dioxide recycling journal July 2019
Molecular engineering of polymeric carbon nitride: advancing applications from photocatalysis to biosensing and more journal January 2018
Beyond C3N4 π-conjugated metal-free polymeric semiconductors for photocatalytic chemical transformations journal January 2021
Recent advances in electrocatalysis with phthalocyanines journal January 2021
Construction of a polymeric cobalt phthalocyanine@mesoporous graphitic carbon nitride composite for efficient photocatalytic CO2 reduction journal January 2021
Unveiling the complex configurational landscape of the intralayer cavities in a crystalline carbon nitride journal January 2022
Simple pyrolysis of urea into graphitic carbon nitride with recyclable adsorption and photocatalytic activity journal January 2011
Porous graphitic carbon nitride synthesized via direct polymerization of urea for efficient sunlight-driven photocatalytic hydrogen production journal January 2012
Status and perspectives of CO2 conversion into fuels and chemicals by catalytic, photocatalytic and electrocatalytic processes journal January 2013
Photocatalytic water oxidation by very small cobalt domains on a silica surface journal January 2013
Irreversible climate change due to carbon dioxide emissions journal January 2009
Structural tuning of heterogeneous molecular catalysts for electrochemical energy conversion journal March 2021
Recent Advances in TiO2-Based Heterojunctions for Photocatalytic CO2 Reduction With Water Oxidation: A Review journal April 2021

Similar Records

Synergizing Electron and Heat Flows in Photocatalyst for Direct Conversion of Captured CO2
Journal Article · Mon Mar 27 00:00:00 EDT 2023 · Angewandte Chemie (International Edition) · OSTI ID:2421786

Synergizing Electron and Heat Flows in Photocatalyst for Direct Conversion of Captured CO 2
Journal Article · Wed Apr 26 00:00:00 EDT 2023 · Angewandte Chemie · OSTI ID:1975297