镍
沸石咪唑盐骨架
法拉第效率
催化作用
咪唑酯
碳纤维
选择性
纳米颗粒
金属
化学工程
粒径
材料科学
无机化学
化学
电化学
纳米技术
金属有机骨架
冶金
电极
物理化学
吸附
有机化学
复合材料
复合数
工程类
作者
Zhida Li,Dong He,Xingxu Yan,Sheng Dai,Sabrina Younan,Zunjian Ke,Xiaoqing Pan,Xin Xiao,Hongjun Wu,Jing Gu
标识
DOI:10.1002/anie.202000318
摘要
Abstract Closing the anthropogenic carbon cycle by converting CO 2 into reusable chemicals is an attractive solution to mitigate rising concentrations of CO 2 in the atmosphere. Herein, we prepared Ni metal catalysts ranging in size from single atoms to over 100 nm and distributed them across N‐doped carbon substrates which were obtained from converted zeolitic imidazolate frameworks (ZIF). The results show variance in CO 2 reduction performance with variance in Ni metal size. Ni single atoms demonstrate a superior Faradaic efficiency (FE) for CO selectivity (ca. 97 % at −0.8 V vs. RHE), while results for 4.1 nm Ni nanoparticles are slightly lower (ca. 93 %). Further increase the Ni particle size to 37.2 nm allows the H 2 evolution reaction (HER) to compete with the CO 2 reduction reaction (CO 2 RR). The FE towards CO production decreases to under 30 % and HER efficiency increase to over 70 %. These results show a size‐dependent CO 2 reduction for various sizes of Ni metal catalysts.
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