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| Efficient and stable electrocatalytic reduction of CO2 by ZIF-8 composites |
| Author Name | Affiliation | E-mail | | WANG Hao-Tian | School of Chemistry & Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China | | | GONG Shan-He | School of the Environment and Safety Engineering Jiangsu University, Zhenjiang, Jiangsu 212013, China | | | WANG Wen-Bo | School of Chemistry & Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China | | | GE Dong-Dong | School of the Environment and Safety Engineering Jiangsu University, Zhenjiang, Jiangsu 212013, China | | | Lü Xiao-Meng | School of Chemistry & Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China | laiyangmeng@163.com |
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| Abstract: Electrocatalytic CO2 reduction reaction (eCO2RR) is still limited by the intrinsic activity and mass transfer of catalysts, resulting in low catalytic activity and high reaction onset potential. Herein, we explored the eCO2RR performance of zeolite imidazole framework (ZIF-8) with different sizes. We took ZIF-8 with a particle size of 50 nm as the research object, and further introduced carbon nanotubes (CNT) as the conductive substrate material. The hierarchical porous structure and hydrophobic interface of ZIF-8-50@CNT were constructed by in-situ growth. The results of eCO2RR experiment showed that the introduction of CNT improved the conductivity of the catalyst, and the optimized composite effectively reduced the onset potential of the reaction. At -1.1 V (versus reversible hydrogen electrode (RHE)), the partial CO current density of ZIF-8-50@CNT was 15.6 mA·cm-2, and the catalyst surface activity of ZIF-8-50@CNT catalyst is increased by 3.5 times that of ZIF-8-50, and the Tafel slope was reduced to 136 mV·dec-1. The selectivity and stability of the product CO were improved, and the Faraday efficiency (FE) of CO remained 80% at -0.9--1.2 V (vs RHE). In the 10 h stability test, the catalyst remained stable. The overall eCO2RR performance of catalyst was enhanced. |
| Keywords: metal-organic framework carbon nanotubes supported catalyst electrocatalytic carbon dioxide reduction |
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| WANG Hao-Tian,GONG Shan-He,WANG Wen-Bo,GE Dong-Dong,Lü Xiao-Meng.Efficient and stable electrocatalytic reduction of CO2 by ZIF-8 composites[J].Chinese Journal of Inorganic Chemistry,2023,39(11):2151-2159. |
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