Zhou, Xinghao and Xiang, Chengxiang (2018) Comparative Analysis of Solar-to-Fuel Conversion Efficiency: A Direct, One-Step Electrochemical CO_2 Reduction Reactor versus a Two-Step, Cascade Electrochemical CO_2 Reduction Reactor. ACS Energy Letters, 3 (8). pp. 1892-1897. ISSN 2380-8195. doi:10.1021/acsenergylett.8b01077. https://resolver.caltech.edu/CaltechAUTHORS:20180717-144513102
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Abstract
Electrochemical and photoelectrochemical (PEC) CO_2 reduction (CO_2R) have the potential to produce sustainable, zero greenhouse gas emission fuels and chemicals. One of the key components in a PEC CO2 reduction device is the electrocatalyst materials for the CO_2R reaction. While significant research advances have been made in the development of CO_2 reduction catalysts and in the understanding of the reaction mechanisms, selective, active, and stable catalyst materials have yet to be identified to directly convert CO_2 into higher reduction products, such as ethanol and ethylene. In contrast, several electrocatalyst systems have exhibited promising selectivity and activity for the first two-electron, two-proton process, such as CO_2R to CO or formate. For example, nanostructured silver electrodes, metal dichalcogenides, and single metal atoms in graphene nanosheets exhibited high Faradaic efficiency (FE) and high reaction rates for CO_2R to CO. A Pd/C nanoparticle-based catalyst incorporated in a 10% efficient solar-to-formate conversion device also exhibited near-unity FE at 10s of mA cm^(–2) for CO_2R to formate. Hence, one alternative strategy is to leverage the efficient first two-electron, two-proton reaction by using a two-step, cascade CO_2 reactor, in which the first catalytic reactor converts CO_2 into CO or formate and the second catalytic reactor converts CO or formate into higher-order reduction products such as ethanol or ethylene. Herein, the solar-to-fuel (STF) conversion efficiencies in a direct, one-step CO2reduction reactor and a two-step, cascade CO_2 reduction reactor were analyzed and compared for two distinctive device configurations.
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Alternate Title: | Comparative Analysis of Solar-to-Fuel Conversion Efficiency: A Direct, One-Step Electrochemical CO2 Reduction Reactor versus a Two-Step, Cascade Electrochemical CO2 Reduction Reactor | |||||||||
Additional Information: | © 2018 American Chemical Society. Received: June 26, 2018; Accepted: July 6, 2018; Published: July 17, 2018. 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. The authors declare no competing financial interest. | |||||||||
Group: | JCAP | |||||||||
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Issue or Number: | 8 | |||||||||
DOI: | 10.1021/acsenergylett.8b01077 | |||||||||
Record Number: | CaltechAUTHORS:20180717-144513102 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20180717-144513102 | |||||||||
Official Citation: | Comparative Analysis of Solar-to-Fuel Conversion Efficiency: A Direct, One-Step Electrochemical CO2 Reduction Reactor versus a Two-Step, Cascade Electrochemical CO2 Reduction Reactor Xinghao Zhou and Chengxiang Xiang ACS Energy Letters 2018 3 (8), 1892-1897 DOI: 10.1021/acsenergylett.8b01077 | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 87935 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | Tony Diaz | |||||||||
Deposited On: | 17 Jul 2018 22:03 | |||||||||
Last Modified: | 16 Nov 2021 00:22 |
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