Coralloid Au enables high-performance Zn–CO2 battery and self-driven CO production
| Autor: | Sanshuang Gao, Hongyi Li, Xuping Sun, Mengmeng Jin, Shusheng Zhang, Jun Luo, Jiaqiang Sun, Xijun Liu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Battery (electricity)
Electrolysis Aqueous solution Materials science Renewable Energy Sustainability and the Environment Membrane electrode assembly Carbon fixation 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Chemical engineering law Molecule General Materials Science 0210 nano-technology Faraday efficiency Power density |
| Zdroj: | Journal of Materials Chemistry A. 9:21024-21031 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d1ta04360a |
| Popis: | High current density and low energy consumption in electrocatalytic CO2 conversion are two key factors for practical CO2 fixation. Herein, coralloid Au was prepared via a facile electrodeposition approach, which showed remarkable performance in a membrane electrode assembly system with the highest CO faradaic efficiency (FECO) of 94.2% at −60 mA cm−2 and 45.3 ml h−1 CO productivity. By using coralloid Au, we built an aqueous Zn–CO2 battery; it yields a high power density of 0.7 mW cm−2, 68 h cyclability, and maintains 63% FECO at a discharge current density of −3.0 mA cm−2. Further, a self-driven CO2 electrolysis unit powered by the as-assembled Zn–CO2 battery was developed for the first time, which achieves a maximum CO productivity of 0.44 ml h−1. Theoretical calculations reveal that the Au (111) plane not only delivers a low energy barrier for the first hydrogenation of CO2 molecule but also stabilizes the key *COOH intermediate, both of which are responsible for efficient electroreduction of CO2 to CO. |
| Databáze: | OpenAIRE |
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