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 | |
| 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
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
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TY - GEN
T1 - 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
AU - Zhou, Xinghao
AU - Liu, Rui
AU - Sun, Ke
AU - Chen, Yikai
AU - Verlage, Erik
AU - Francis, Sonja A.
AU - Lewis, Nathan S
AU - Xiang, Cheng Xiang
PY - 2017
Y1 - 2017
N2 - 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%.
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%.
UR - http://www.scopus.com/inward/record.url?scp=85021846639&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85021846639&partnerID=8YFLogxK
U2 - 10.1149/07704.0031ecst
DO - 10.1149/07704.0031ecst
M3 - Conference contribution
VL - 77
SP - 31
EP - 41
BT - Processes at the Semiconductor Solution Interface 7
PB - Electrochemical Society Inc.
ER -