标题: Co-regulation of intermediate binding and water activation in sulfur-doped bismuth nanosheets for electrocatalytic CO2 reduction to formate
作者: Wang, M (Wang, Miao); Liu, S (Liu, Shuai); Chen, B (Chen, Bo); Huang, MJ (Huang, Moujie); Peng, C (Peng, Chuang)
来源出版物: CHEMICAL ENGINEERING JOURNAL 卷: 451 文献号: 139056 DOI: 10.1016/j.cej.2022.139056 子辑: 4 出版年: JAN 1 2023
摘要: Electrochemical reduction CO2 to formate is highly desirable but promoting the stability, selectivity and current density still remains demanding. Here, Bi-S catalysts were prepared through in-situ electrochemical topotactic transformation. The Bi-S2 catalyst displays peak formate faradaic efficiency of 96.7 % at -0.9 V, high formate faradaic efficiency (>93 %) from -0.7 V to -1.1 V and durable stability of 35 h. A better formate faradaic efficiency (-97.8 % at -0.9 V) and formate partial current density (-182.1 mA cm-2) are achieved in a flow cell. The electrochemical measurement, coupled with In-situ FTIR and sulfur blocking method, reveal that the sulfur doping achieves co-regulation of intermediate binding and water activation. The energetically favourable HCOO* pathway and facilitated water activation promote the proton-coupled electron transfer process toward formate production. This work offers new insight for rational design of high-performance electrodes for CO2RR.
作者关键词: CO2 reduction; Formate; Sulfur doping; H2O activation; Electronic structure regulation
地址: [Wang, Miao; Chen, Bo; Huang, Moujie; Peng, Chuang] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
[Liu, Shuai] Univ Nottingham Ningbo China, New Mat Inst, Dept Chem & Environm Engn, Ningbo 315100, Peoples R China.
通讯作者地址: Peng, C (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
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