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Relationships between the Surface Hydrophilicity of a Bismuth Electrode and the Product Selectivity of Electrocatalytic CO Reduction. | LitMetric

Two types of bismuth films (micro-Bi and nano-Bi) were prepared, and their electrocatalytic behavior was studied in terms of reduction current and product selectivity in a potential range of -0.776 to -1.376 V vs RHE. CO and HO molecules competed with each other for reduction on the surfaces of both types of films, and formate and H were the respective major products of reductive reactions. Under the same conditions, nano-Bi exhibited lower selectivity for formate and higher selectivity for H compared to the respective micro-Bi cases with bismuth films of similar thickness. This can be attributed to the higher hydrophilicity of bismuth film surfaces of nano-Bi due to surface nanoscale roughness and lower surface-carbon content compared with those of micro-Bi. Our results suggest a new strategy for controlling the selectivity of electrocatalytic CO reduction under aqueous electrolytes through the use of surface engineering.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11635683PMC
http://dx.doi.org/10.1021/acsomega.4c09642DOI Listing

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