电催化剂
格式化
铋
法拉第效率
材料科学
可逆氢电极
电化学
催化作用
电解
无机化学
选择性
水溶液
化学工程
电解水
本体电解
纳米技术
电极
化学
物理化学
电解质
循环伏安法
工作电极
有机化学
工程类
冶金
作者
Panpan Su,Wenbin Xu,Yanling Qiu,Taotao Zhang,Xianfeng Li,Huamin Zhang
出处
期刊:Chemsuschem
[Wiley]
日期:2018-01-25
卷期号:11 (5): 848-853
被引量:112
标识
DOI:10.1002/cssc.201702229
摘要
Abstract Electrochemical reduction of CO 2 to value‐added products is an important and challenging reaction for sustainable energy study. Herein, bismuth nanosheets with thickness of around 10 nm were prepared through the electrochemical reduction of Bi 3+ . Ultrathin Bi nanosheets with numerous low‐coordination sites can efficiently reduce CO 2 to formate in aqueous solution. Within the potential range of −0.9 to −1.2 V vs. reversible hydrogen electrode (RHE), the faradaic efficiency of formate is over 90 %, outperforming many Bi catalysts. At −0.7 V, the Bi nanosheets exhibit much higher current for formate generation than that of bulk Bi, attributed to a high surface area and also modified intrinsic electronic properties brought about by the ultrathin structure. DFT calculations demonstrate that Bi nanosheets have much higher density of states at the Fermi level compared to bulk Bi, favoring improved CO 2 reduction on Bi nanosheets. At −1.0 V, Bi nanosheets exhibit high selectivity for formate and excellent stability during 5 h of electrolysis.
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