Phosphomolybdic Acid-Assisted Growth of Ultrathin Bismuth Nanosheets for Enhanced Electrocatalytic Reduction of CO2 to Formate

被引:41
作者
Guo, Si-Xuan [1 ,2 ]
Zhang, Ying [1 ,2 ]
Zhang, Xiaolong [1 ]
Easton, Christopher D. [3 ]
MacFarlane, Douglas R. [1 ,2 ]
Zhang, Jie [1 ,2 ]
机构
[1] Monash Univ, Sch Chem, Clayton, Vic 3800, Australia
[2] Monash Univ, ARC Ctr Excellence Electromat Sci, Clayton, Vic 3800, Australia
[3] CSIRO Mfg, Bayview Ave, Clayton, Vic 3168, Australia
基金
澳大利亚研究理事会;
关键词
bismuth; carbon dioxide; electrocatalysis; polyoxometalates; porous materials; ELECTRONIC-STRUCTURE; MASS-SPECTROMETRY; HIGH-EFFICIENCY; RAMAN-SPECTRA; BI; ELECTRODEPOSITION; NANOWIRES; CATALYSTS; DYNAMICS; CLOTH;
D O I
10.1002/cssc.201802409
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Oxides containing two-dimensional metallic catalysts have shown enhanced catalytic activity, stability, and product selectivity. Porous three-dimensional structures maximize the accessibility of the active sites, thus enhancing the catalytic performance of the catalysts. By integrating these desirable features in a single catalyst, further improvement in catalytic activity and selectivity is expected. In this study, oxide-containing bismuth (Bi) nanosheets of about 4 nm thickness interconnected to form a porous three-dimensional structure were synthesized by electrodeposition in the presence of phosphomolybdic acid under hydrogen evolution conditions. These Bi nanosheets catalyze CO2 reduction in a CO2-saturated 0.5 m NaHCO3 solution to formate with a faradaic efficiency of 93 +/- 2 % at -0.86 V vs. RHE with a formate partial current density as high as 30 mA cm(-2). The Tafel slope of about 78 mV dec(-1) suggests that the protonation of the adsorbed CO2.- is the rate-limiting step.
引用
收藏
页码:1091 / 1100
页数:10
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