A Bismuth Species-Decorated ZnO/p-Si Photocathode for High Selectivity of Formate in CO2 Photoelectrochemical Reduction

Qingming Zhang, Xiaoxia Zhou, Zhaoyu Kuang, Yi Xue, Chengjin Li, Min Zhu, Chung Yuan Mou, Hangrong Chen

研究成果: 雜誌貢獻文章同行評審

1 引文 斯高帕斯(Scopus)

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.

原文英語
頁(從 - 到)2380-2387
頁數8
期刊ACS Sustainable Chemistry and Engineering
10
發行號7
DOIs
出版狀態已發佈 - 2月 21 2022
對外發佈

ASJC Scopus subject areas

  • 化學 (全部)
  • 環境化學
  • 化學工程 (全部)
  • 可再生能源、永續發展與環境

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