https://scholars.lib.ntu.edu.tw/handle/123456789/626193
標題: | A Bismuth Species-Decorated ZnO/p-Si Photocathode for High Selectivity of Formate in CO2 Photoelectrochemical Reduction | 作者: | Zhang Q Zhou X Kuang Z Xue Y Li C Zhu M CHUNG-YUAN MOU Chen H. |
關鍵字: | Bi-Bi2O3/ZnO/p-Si; CO2 reduction; formate; photocathode; photoelectrochemical | 公開日期: | 2022 | 卷: | 10 | 期: | 7 | 起(迄)頁: | 2380-2387 | 來源出版物: | ACS Sustainable Chemistry and Engineering | 摘要: | Photoelectrochemical (PEC) reduction of CO2 to high value-added chemicals or fuel is an effective way to remit insufficient energy supply and global warming. Herein, Bi species-modified p-n heterojunction ZnO/p-Si was synthesized by a hydrothermal method and a subsequent electrodeposition process. For the PEC CO2 reduction reaction (CO2RR), the obtained photocathode Bi-Bi2O3/ZnO/p-Si not only improves the light absorption capacity because of p-Si and plasma metal Bi, but also increases the selectivity of CO2 reduction products because of the existence of Bi species. In particular, compared with the electrochemical CO2RR, the faraday efficiency of formate shows a 1.8 fold increase for the optimal sample Bi-Bi2O3/ZnO/p-Si reaching 84.3% in the PEC CO2RR at −0.95 V vs RHE. More importantly, the current density and product selectivity have no decay within 8 h, implying its high stability. In addition,, a high applied bias photon-to-current efficiency of 1.14% and an energy efficiency value of 56.21% were achieved for the Bi-Bi2O3/ZnO/p-Si photocathode at −0.95 V vs RHE, confirming its high PEC activity. A possible electron transfer mechanism for the Bi-Bi2O3/ZnO/p-Si photocathode is also proposed. © 2022 American Chemical Society |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85125088186&doi=10.1021%2facssuschemeng.1c06712&partnerID=40&md5=e900f0a03361e5a4acbd600e4d3a49fe https://scholars.lib.ntu.edu.tw/handle/123456789/626193 |
ISSN: | 21680485 | DOI: | 10.1021/acssuschemeng.1c06712 | SDG/關鍵字: | Carbon dioxide; Electron transitions; Energy efficiency; Global warming; Heterojunctions; II-VI semiconductors; Light absorption; Photocathodes; Photoelectrochemical cells; Reduction; Silicon; Zinc oxide; % reductions; Bi-bi2O3/ZnO/p-si; CO 2 reduction; CO2 reduction; Formate; High selectivity; Photocathode; Photoelectrochemicals; Reduction reaction; ZnO/p-Si; Bismuth compounds |
顯示於: | 化學系 |
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