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

Xinghao Zhou; Rui Liu; Ke Sun; Yikai Chen; Erik Verlage; Sonja A. Francis; Nathan S Lewis; Cheng Xiang Xiang

doi:10.1149/07704.0031ecst

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

Xinghao Zhou, Rui Liu, Ke Sun, Yikai Chen, Erik Verlage, Sonja A. Francis, Nathan S Lewis, Cheng Xiang Xiang

California Institute of Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

A solar-driven CO₂-reduction (CO₂R) cell, consisting 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 constructed. 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%.

Original language	English
Title of host publication	Processes at the Semiconductor Solution Interface 7
Publisher	Electrochemical Society Inc.
Pages	31-41
Number of pages	11
Volume	77
Edition	4
ISBN (Electronic)	9781607685395
DOIs	https://doi.org/10.1149/07704.0031ecst
Publication status	Published - 2017
Event	Processes at the Semiconductor Solution Interface 7, PSSI 2017 - 231st ECS Meeting 2017 - New Orleans, United States Duration: May 28 2017 → Jun 1 2017

Other

Other	Processes at the Semiconductor Solution Interface 7, PSSI 2017 - 231st ECS Meeting 2017
Country	United States
City	New Orleans
Period	5/28/17 → 6/1/17

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ASJC Scopus subject areas

Engineering(all)

Cite this

Zhou, X., Liu, R., Sun, K., Chen, Y., Verlage, E., Francis, S. A., Lewis, N. S., & Xiang, C. X. (2017). 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. In Processes at the Semiconductor Solution Interface 7 (4 ed., Vol. 77, pp. 31-41). Electrochemical Society Inc.. https://doi.org/10.1149/07704.0031ecst

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. / Zhou, Xinghao; Liu, Rui; Sun, Ke; Chen, Yikai; Verlage, Erik; Francis, Sonja A.; Lewis, Nathan S; Xiang, Cheng Xiang.

Processes at the Semiconductor Solution Interface 7. Vol. 77 4. ed. Electrochemical Society Inc., 2017. p. 31-41.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Zhou, X, Liu, R, Sun, K, Chen, Y, Verlage, E, Francis, SA, Lewis, NS & Xiang, CX 2017, 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. in Processes at the Semiconductor Solution Interface 7. 4 edn, vol. 77, Electrochemical Society Inc., pp. 31-41, Processes at the Semiconductor Solution Interface 7, PSSI 2017 - 231st ECS Meeting 2017, New Orleans, United States, 5/28/17. https://doi.org/10.1149/07704.0031ecst

Zhou X, Liu R, Sun K, Chen Y, Verlage E, Francis SA et al. 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. In Processes at the Semiconductor Solution Interface 7. 4 ed. Vol. 77. Electrochemical Society Inc. 2017. p. 31-41 https://doi.org/10.1149/07704.0031ecst

Zhou, Xinghao ; Liu, Rui ; Sun, Ke ; Chen, Yikai ; Verlage, Erik ; Francis, Sonja A. ; Lewis, Nathan S ; Xiang, Cheng 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. Processes at the Semiconductor Solution Interface 7. Vol. 77 4. ed. Electrochemical Society Inc., 2017. pp. 31-41

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abstract = "A solar-driven CO2-reduction (CO2R) cell, consisting 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 constructed. 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%.",

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AB - A solar-driven CO2-reduction (CO2R) cell, consisting 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 constructed. 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%.

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10.1149/07704.0031ecst