CO2 Electroreduction at Low Overpotential on Oxide-Derived Cu/Carbons Fabricated from Metal Organic Framework

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• 作者：Kun Zhao ; Yanming Liu ; Xie QuanShuo Chen ; Hongtao Yu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 15, 2017
• 年：2017
• 卷：9
• 期：6
• 页码：5302-5311
• 全文大小：656K
• ISSN：1944-8252

文摘

Electrochemical reduction of COb>2b> to chemical feedstocks is an attractive solution that prevents COb>2b> accumulation in the atmosphere, but it remains a great challenge to develop the cost-effective catalysts. Herein, we synthesized oxide-derived Cu/carbon (OD Cu/C) catalysts by a facile carbonization of Cu-based MOF (HKUST-1). The resulting materials exhibited highly selective COb>2b> reduction to alcohol compounds with total faradic efficiencies of 45.2–71.2% at −0.1 to −0.7 V versus reversible hydrogen electrode (RHE). High-yield methanol and ethanol has been achieved on OD Cu/C-1000 with the production rates of 5.1–12.4 and 3.7–13.4 mg L^–1 h^–1, respectively. Notably, the onset potential for Cb>2b>Hb>5b>OH formation is near −0.1 V (versus RHE), corresponding to ∼190 mV of overpotential, which is among the lowest overpotentials reported to date for the reduction of COb>2b> to Cb>2b>Hb>5b>OH. The improvements in activity and selectivity of the oxide-derived Cu/carbon might be attributed to the synergistic effect between the highly dispersed copper and the matrix of porous carbon. These findings provide a new insight into design of practical catalysts for decreasing atmospheric COb>2b> levels and synthesizing liquid fuels.