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

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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
JournalChemSusChem
Volume12
Issue number5
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

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

Cite this

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title = "Phosphomolybdic Acid-Assisted Growth of Ultrathin Bismuth Nanosheets for Enhanced Electrocatalytic Reduction of CO2 to Formate",
abstract = "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.",
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Phosphomolybdic Acid-Assisted Growth of Ultrathin Bismuth Nanosheets for Enhanced Electrocatalytic Reduction of CO2 to Formate. / Guo, Si Xuan; Zhang, Ying; Zhang, Xiaolong; Easton, Christopher D.; MacFarlane, Douglas R.; Zhang, Jie.

In: ChemSusChem, Vol. 12, No. 5, 01.01.2019, p. 1091-1100.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Easton, Christopher D.

AU - MacFarlane, Douglas R.

AU - Zhang, Jie

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AB - 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.

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