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 language | English |
---|---|
Pages (from-to) | 1091-1100 |
Number of pages | 10 |
Journal | ChemSusChem |
Volume | 12 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1 Jan 2019 |
Keywords
- bismuth
- carbon dioxide
- electrocatalysis
- polyoxometalates
- porous materials
Equipment
-
Centre for Electron Microscopy (MCEM)
Peter Miller (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility