Robust Bi Metal–Organic Framework-Derived Catalyst for the Selective Electroreduction of CO2 to Formate at Current Densities up to 1 A cm–2 in Gas Diffusion Electrodes
Angela G. Selva Ochoa, Faezeh Habibzadeh, Elod L. Gyenge
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引用次数: 0
Abstract
Electrochemical reduction of CO2 to useful products requires selective and stable catalysts that can be easily synthesized and are cost-effective. In this work, we investigate the Bi CAU-17 metal–organic framework (MOF) synthesized by a novel and scalable method to generate in situ highly active Bi2O2CO3 catalyst for CO2 electroreduction to formate in either KHCO3 or KOH electrolytes. The Bi CAU-17-derived catalyst provides high faradaic efficiencies toward formate (FEHCOO– = 85–100%) at current densities up to 1 A cm–2 in a gas diffusion electrode with a low catalyst loading (0.5 mg cm–2). Comparative experiments between commercial and in situ generated Bi2O2CO3 from Bi CAU-17 showed that the latter has superior catalytic performance at high current densities (>300 mA cm–2) and with stable activity after 26 h of continuous electrolysis at 200 mA cm–2 in the pH range 8–14. These results highlight the importance of generating in situ active Bi/Bi–O sites that promote the selective reduction of CO2 to formate.
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.