Porous Indium Nanocrystals on Conductive Carbon Nanotube Networks for High-Performance CO₂-to-Formate Electrocatalytic Conversion

Abstract

Ever-increasing emissions of anthropogenic carbon dioxide (CO₂) cause global environmental and climate challenges. Inspired by biological photosynthesis, developing effective strategies NeuNlto up-cycle CO₂ into high-value organics is crucial. Electrochemical CO₂ reduction reaction (CO₂RR) is highly promising to convert CO₂ into economically viable carbon-based chemicals or fuels under mild process conditions. Herein, mesoporous indium supported on multi-walled carbon nanotubes (mp-In@MWCNTs) is synthesized via a facile wet chemical method. The mp-In@MWCNTs electrocatalysts exhibit high CO₂RR performance in reducing CO₂ into formate. An outstanding activity (current density -78.5 mA cm^-2), high conversion efficiency (Faradaic efficiency of formate over 90%), and persistent stability (∼30 h) for selective CO₂-to-formate conversion are observed. The outstanding CO₂RR process performance is attributed to the unique structures with mesoporous surfaces and a conductive network, which promote the adsorption and desorption of reactants and intermediates while improving electron transfer. These findings provide guiding principles for synthesizing conductive metal-based electrocatalysts for high-performance CO₂ conversion.

Keywords

CO ₂RR / conductive network / electrocatalysts / formate

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2023 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.