Understanding Structure‐activity Relationship on Metal‐Organic‐Framework‐Derived Catalyst for CO2 Electroreduction to C2 Products. Issue 16 (20th August 2021)

• Record Type: Journal Article
• Authors: Han, Yunxi; Zhu, Shuaikang; Xu, Shuang; Niu, Xiaopo; Xu, Zhihong; Zhao, Rong; Wang, Qingfa
• Is Part Of: ChemElectroChem. Volume 8:Issue 16(2021)
• Page Start: 3174
• Page End: 3180
• Publication Date: 2021-08-20
• Subjects: CO2 electroreduction -- metal organic framework -- morphological evolution -- structural reconstruction -- electrocatalysis; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202100942
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Metal‐organic frameworks (MOFs) have been widely studied for electrochemical CO2 reduction reaction (CO2 RR). However, the application of negative potential tends to trigger its structural reconstruction and component alteration. It is of great significance to study the relationship between the structural evolution of MOF‐derived materials and product selectivity under the reaction conditions. Herein, we fabricate a HKUST‐1 thin film on carbon fiber paper by a facile electrodeposition approach to investigate the variation of CO2 RR activity with HKUST‐1 structural reconstruction. During the CO2 RR process, the HKUST‐1 reconstructs into two structures successively over time: 3D nanospheres composed of numerous small fragments and 3D nano‐network composed of cross‐linked nanobelts in different directions. The former shows a better catalytic activity due to more active sites, lower charge transfer resistance and higher Cu + /Cu 0 ratio. The optimum Faradaic efficiency (FE) of C2 products (ethylene and ethanol) reaches 58.6 % at −0.98 V versus reversible hydrogen electrode (RHE). Abstract : The structural reconstruction of HKUST‐1 on carbon fiber paper and the activity in CO2 electroreduction is investigated. The HKUST‐1 initially reconstructed into highly active 3D nanospheres and then into stable nanobelts after 120 minutes. The 3D nanospheres structure shows the best Faradaic efficiency of C2 products up to 58.6 %.