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

Si Xuan Guo, Ying Zhang, Xiaolong Zhang, Christopher D. Easton, Douglas R. MacFarlane, Jie Zhang

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11 Citations (Scopus)


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 CO 2 .− is the rate-limiting step.

Original languageEnglish
Pages (from-to)1091-1100
Number of pages10
Issue number5
Publication statusPublished - 1 Jan 2019


  • bismuth
  • carbon dioxide
  • electrocatalysis
  • polyoxometalates
  • porous materials

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