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Title: Solar-Driven Reduction of 1 atm CO 2 to Formate at 10% Energy-Conversion Efficiency by Use of a TiO 2 -Protected III-V Tandem Photoanode in Conjunction with a Bipolar Membrane and a Pd/C Cathode Electrocatalyst

Abstract

A solar-driven CO 2-reduction (CO2R) cell, made up of a tandem GaAs/InGaP/TiO2/Ni photoanode in 1.0 M KOH(aq) (pH=13.7) to facilitate the oxygen-evolution reaction (OER), a Pd/C nanoparticle-coated Ti mesh cathode in 2.8 M KHCO3(aq) (pH=8.0) to perform the CO2R reaction, and a bipolar membrane to allow for steady-state operation of the catholyte and anolyte at different bulk pH values, was built. At the operational current density of 8.5 mA cm-2, in 2.8 M KHCO3(aq), the cathode exhibited <100 mV overpotential and >94% Faradaic efficiency for the reduction of 1 atm of CO2(g) to formate. The anode exhibited 320 ± 7 mV overpotential for the OER in 1.0 M KOH(aq), and the bipolar membrane exhibited ~480 mV voltage loss with minimal product crossover as well as >90% and >95% selectivity for protons and hydroxide ions, respectively. The solar-driven CO2R cell converted sunlight to fuels at an energy-conversion efficiency of ~10%.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1633780
Grant/Contract Number:  
SC0004993
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ECS Transactions (Online)
Additional Journal Information:
Journal Volume: 77; Journal Issue: 4; Journal ID: ISSN 1938-6737
Publisher:
Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION

Citation Formats

Zhou, Xinghao, Liu, Rui, Sun, Ke, Chen, Yikai, Verlage, Erik, Francis, Sonja A., Lewis, Nathan S., and Xiang, Chengxiang. Solar-Driven Reduction of 1 atm CO2 to Formate at 10% Energy-Conversion Efficiency by Use of a TiO2 -Protected III-V Tandem Photoanode in Conjunction with a Bipolar Membrane and a Pd/C Cathode Electrocatalyst. United States: N. p., 2017. Web. doi:10.1149/07704.0031ecst.
Zhou, Xinghao, Liu, Rui, Sun, Ke, Chen, Yikai, Verlage, Erik, Francis, Sonja A., Lewis, Nathan S., & Xiang, Chengxiang. Solar-Driven Reduction of 1 atm CO2 to Formate at 10% Energy-Conversion Efficiency by Use of a TiO2 -Protected III-V Tandem Photoanode in Conjunction with a Bipolar Membrane and a Pd/C Cathode Electrocatalyst. United States. https://doi.org/10.1149/07704.0031ecst
Zhou, Xinghao, Liu, Rui, Sun, Ke, Chen, Yikai, Verlage, Erik, Francis, Sonja A., Lewis, Nathan S., and Xiang, Chengxiang. Tue . "Solar-Driven Reduction of 1 atm CO2 to Formate at 10% Energy-Conversion Efficiency by Use of a TiO2 -Protected III-V Tandem Photoanode in Conjunction with a Bipolar Membrane and a Pd/C Cathode Electrocatalyst". United States. https://doi.org/10.1149/07704.0031ecst. https://www.osti.gov/servlets/purl/1633780.
@article{osti_1633780,
title = {Solar-Driven Reduction of 1 atm CO2 to Formate at 10% Energy-Conversion Efficiency by Use of a TiO2 -Protected III-V Tandem Photoanode in Conjunction with a Bipolar Membrane and a Pd/C Cathode Electrocatalyst},
author = {Zhou, Xinghao and Liu, Rui and Sun, Ke and Chen, Yikai and Verlage, Erik and Francis, Sonja A. and Lewis, Nathan S. and Xiang, Chengxiang},
abstractNote = {A solar-driven CO2-reduction (CO2R) cell, made up of a tandem GaAs/InGaP/TiO2/Ni photoanode in 1.0 M KOH(aq) (pH=13.7) to facilitate the oxygen-evolution reaction (OER), a Pd/C nanoparticle-coated Ti mesh cathode in 2.8 M KHCO3(aq) (pH=8.0) to perform the CO2R reaction, and a bipolar membrane to allow for steady-state operation of the catholyte and anolyte at different bulk pH values, was built. At the operational current density of 8.5 mA cm-2, in 2.8 M KHCO3(aq), the cathode exhibited <100 mV overpotential and >94% Faradaic efficiency for the reduction of 1 atm of CO2(g) to formate. The anode exhibited 320 ± 7 mV overpotential for the OER in 1.0 M KOH(aq), and the bipolar membrane exhibited ~480 mV voltage loss with minimal product crossover as well as >90% and >95% selectivity for protons and hydroxide ions, respectively. The solar-driven CO2R cell converted sunlight to fuels at an energy-conversion efficiency of ~10%.},
doi = {10.1149/07704.0031ecst},
url = {https://www.osti.gov/biblio/1633780}, journal = {ECS Transactions (Online)},
issn = {1938-6737},
number = 4,
volume = 77,
place = {United States},
year = {2017},
month = {4}
}

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