Efficient electrochemical ethanol-to-CO2 conversion at rhodium and bismuth hydroxide interfaces

Improving the CO2 selectivity of ethanol oxidation reaction (EOR) is a crucial research topic right now. Rh could effectively break the C-C bond of ethanol, nevertheless, pristine Rh still exhibit negligible EOR activity due to the poisoning effect of C1 intermediates. To solve it, here we fabricate modified Rh interfaces with highly-dispersive Bi(OH)(3) species as directed by the Langmuir-Hinshelwood Mechanism, the strong interaction be-tween Rh and Bi(OH)(3) could provide the so-called electronic effect and bifunctional effect. Thus it facilitates the C-C bond cleavage at Rh sites and the electrooxidation of as-generated C1 intermediates even at low over-potentials. Eventually, the optimal Rh-Bi(OH)(3) catalysts show an apparent C1 pathway faraday efficiency of 26.2% at 0.67 V vs. RHE, the EOR mass activity of ca. 3500 mA mg(-1 Rh)and 10-hour-long durability. This work could provide an insightful and promising route in promoting the CO2 selectivity of EOR with high activity and long stability.

Automated summary

The research team successfully improved the CO2 selectivity of ethanol oxidation reaction by fabricating highly-dispersive Bi(OH)(3) species on Rh interfaces, addressing the poisoning effect of C1 intermediates on the original Rh activity. The strong interaction between Rh and Bi(OH)(3) enhanced the catalyst's activity and stability.