文献类型：期刊文献

英文题名：Controllable growth of branched silver crystals over a rod of the same material as an efficient electrode in CO2 reduction at high current densities

作者：Yan, Shenglin[1];Mahyoub, Samah A.[1];Lin, Jing[1];Zhang, Chunxiao[1];Hu, Qing[1];Zhong, Juhua[2];Chen, Chengzhen[1];Zhang, Fanghua[1];Cheng, Zhenmin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Sci, Dept Phys, Shanghai 200237, Peoples R China

年份：2022

卷号：405

起止页码：224

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20215111371599);WOS:【SCI-EXPANDED(收录号:WOS:000753125900001)】；

语种：英文

外文关键词：Ag dendrites foam; Controllable growth; CO2 electroreduction; High current densities

摘要：Ultrathin Ag nanosheets (ANS), rice spike-like Ag dendrites (ADD) and porous Ag dendrites foam (ADDF) are synthesized respectively via a capping agent and electric field-induced Ag crystals growth approach. Compared with ANS and ADD, ADDF catalysts possess significantly increased CO Faradaic efficiency (FE) and can be operated at a broader applied current range due to the inter-connective porous macrostructure of ADDF catalysts with more abundant active sites, which can afford plenty of pore channels to substantially impel CO2 diffusion to reaction sites, therefore maintaining a high rate of CO2 reduction. Furthermore, unique conical microstructure can intensify the local electric field to raise the CO2 concentration at the reaction sites. ADDF-2 exhibits a CO Faradaic efficiency of 96.84% at -28.8 mA cm(-2) in a membrane microchannel reactor at an optimal gas-liquid ratio of 1:2. To increase the CO2 concentration, by increasing the CO2 pressure (3 similar to 9.5 bar), so that CO partial current density can reach -288.68 mA cm(-2), which is the highest one achieved so far in the liquid phase with neutral pH. (C) 2021 Elsevier Inc. All rights reserved.