CuO (111) Microcrystalline Evoked Indium-Organic Framework for Efficient Electroreduction of CO2 to Formate

Honghao Huang; Kaihang Yue; Chaofan Liu; Ke Zhan; Hongliang Dong; Ya Yan

doi:10.1002/smll.202400441

CuO (111) Microcrystalline Evoked Indium-Organic Framework for Efficient Electroreduction of CO₂ to Formate

Small. 2024 Apr 9:e2400441. doi: 10.1002/smll.202400441. Online ahead of print.

Authors

Honghao Huang^{1

2}, Kaihang Yue², Chaofan Liu³, Ke Zhan¹, Hongliang Dong⁴, Ya Yan²

Affiliations

¹ School of Materials and Chemistry, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai, 200093, China.
² State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS), 585 Heshuo Road, Shanghai, 200050, China.
³ School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
⁴ Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.

PMID: 38593335
DOI: 10.1002/smll.202400441

Abstract

Electrochemical reduction of carbon dioxide (CO₂RR) to formate is economically beneficial but suffers from poor selectivity and high overpotential. Herein, enriched microcrystalline copper oxide is introduced on the surface of indium-based metal-organic frameworks. Benefiting from the CuO (111) microcrystalline shell and formed catalytic active In-Cu interfaces, the obtained MIL-68(In)/CuO heterostructure display excellent CO₂RR to formate with a Faradaic efficiency (FE) as high as 89.7% at low potential of only -0.7 V vs. RHE in a flow cell. Significantly, the membrane electrode assembly (MEA) cell based on MIL-68(In)/CuO exhibit a remarkable current density of 640.3 mA cm^-2 at 3.1 V and can be stably operated for 180 h at 2.7 V with a current density of 200 mA cm^-2. The ex/in situ electrochemical investigations reveal that the introduction of CuO increases the formation rate of the carbon dioxide reduction intermediate ^*HCOO^- and inhibits the competitive hydrogen evolution reaction. This work not only provides an in-depth study of the mechanism of the CO₂RR pathways on In/Cu composite catalyst but also offers an effective strategy for the interface design of electrocatalytic carbon dioxide reduction reaction.

Keywords: CO2 reduction; bimetallic interface; copper oxide; electrocatalysis; indium–organic framework.

Abstract

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