Abstract
Electrocatalytic converting CO2 into chemical products has emerged as a promising approach to achieving carbon neutrality. Herein, we report a bismuth-based catalyst with high curvature terminal and amorphous layer which fabricated via two-step electrodeposition achieves stable formate output in a wide voltage window of 600 mV. The Faraday efficiency (FE) of formate reached up to 99.4% at −0.8 V vs. RHE and it remained constant for more than 92 h at −15 mA cm−2. More intriguingly, FE formate of 95.4% can be realized at a current density of industrial grade (−667.7 mA cm−2) in flow cell. The special structure promoted CO2 adsorption and reduced its activation energy and enhanced the electric-thermal field and K+ enrichment which accelerated the reaction kinetics. In situ spectroscopy and theoretical calculation further confirmed that the introduction of amorphous structure is beneficial to adsorpting CO2 and stabling *OCHO intermediate. This work provides special insights to fabricate efficient electrocatalysts by means of structural and crystal engineering and makes efforts to realize the industrialization of bismuth-based catalysts.
Published Version
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