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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

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 (2017) 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. ECS Transactions, 77 (4). pp. 31-41. ISSN 1938-6737. http://resolver.caltech.edu/CaltechAUTHORS:20180914-100811320

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Abstract

A solar-driven CO_2-reduction (CO2R) cell, consisting of a tandem GaAs/InGaP/TiO_2/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 KHCO_3(aq) (pH=8.0) to perform the CO_2R reaction, and a bipolar membrane to allow for steady-state operation of the catholyte and anolyte at different bulk pH values, was constructed. At the operational current density of 8.5 mA cm^(-2), in 2.8 M KHCO_3(aq), the cathode exhibited <100 mV overpotential and >94% Faradaic efficiency for the reduction of 1 atm of CO_2(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 CO_2R cell converted sunlight to fuels at an energy-conversion efficiency of ~10%.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1149/07704.0031ecstDOIArticle
ORCID:
AuthorORCID
Zhou, Xinghao0000-0001-9229-7670
Sun, Ke0000-0001-8209-364X
Lewis, Nathan S.0000-0001-5245-0538
Xiang, Chengxiang0000-0002-1698-6754
Alternate 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
Additional Information:© 2017 ECS - The Electrochemical Society. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. S.A.F. acknowledges the Resnick Sustainability Institute at Caltech for a Postdoctoral Fellowship. The authors also thank N. Dalleska (Caltech) for his assistance with measurements and analysis of the ICPMS and TIC data.
Group:JCAP, Resnick Sustainability Institute
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Resnick Sustainability InstituteUNSPECIFIED
Record Number:CaltechAUTHORS:20180914-100811320
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20180914-100811320
Official Citation:Xinghao Zhou, Rui Liu, Ke Sun, Yikai Chen, Erik Verlage, Sonja A Francis, Nathan S Lewis, and Chengxiang("CX") Xiang 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 ECS Trans. 2017 77(4): 31-41; doi:10.1149/07704.0031ecst
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89638
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:14 Sep 2018 22:13
Last Modified:14 Sep 2018 22:13

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