材料科学
法拉第效率
催化作用
电化学
可逆氢电极
化学工程
碳纤维
选择性
电催化剂
无定形固体
电极
纳米技术
无机化学
物理化学
化学
工作电极
有机化学
复合材料
复合数
工程类
作者
Qun Li,Jiabin Wu,Lei Lv,Lirong Zheng,Qiang Zheng,Siyang Li,Caoyu Yang,Chang Long,Sheng Chen,Zhiyong Tang
标识
DOI:10.1002/adma.202305508
摘要
Electrochemical CO2 conversion to value-added multicarbon (C2+ ) chemicals holds promise for reducing CO2 emissions and advancing carbon neutrality. However, achieving both high conversion rate and selectivity remains challenging due to the limited active sites on catalysts for carbon-carbon (C─C) coupling. Herein, porous CuO is coated with amorphous CuSiO3 (p-CuSiO3 /CuO) to maximize the active interface sites, enabling efficient CO2 reduction to C2+ products. Significantly, the p-CuSiO3 /CuO catalyst exhibits impressive C2+ Faradaic efficiency (FE) of 77.8% in an H-cell at -1.2 V versus reversible hydrogen electrode in 0.1 M KHCO3 and remarkable C2 H4 and C2+ FEs of 82% and 91.7% in a flow cell at a current density of 400 mA cm-2 in 1 M KOH. In situ characterizations and theoretical calculations reveal that the active interfaces facilitate CO2 activation and lower the formation energy of the key intermediate *OCCOH, thus promoting CO2 conversion to C2+ . This work provides a rational design for steering the active sites toward C2+ products.
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