Issue 34, 2024

In situ transformation of a Bi-based MOF to a highly active catalyst for CO2 reduction

Abstract

Electrochemical carbon dioxide reduction reaction (ECO2RR) is an effective means to promote carbon cycling. Recently, Bi-based metal–organic frameworks (MOFs) have attracted significant attention due to their high efficiency for formic acid generation in ECO2RR, however, their composition and morphology transformation during electrocatalysis still lack a deep exploration. Herein, a Bi-MOF with 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine (H3TATB) ligand is used as the prototype to investigate its in situ transformation during ECO2RR. With various characterization methods, the detailed transformation processes are revealed. Firstly, the Bi-MOF was transformed into Bi2O2CO3 due to ligand substitution in KHCO3 electrolyte, resulting in changes in both shape and composition. Secondly, during ECO2RR, the Bi3+ ions can be reduced into metallic Bi0 nanoparticles and act as the real active component for ECO2RR. The resultant catalyst exhibits a high selectivity of up to 94.3% towards formate generation. At an optimal potential of −1.08 V vs. RHE, the catalyst can maintain a current density of −25 mA cm−2 and a faradaic efficiency of formate over 90% for 14.5 hours. This work not only develops an efficient electrocatalyst for ECO2RR but also provides a new insight into the in situ reconstruction of MOF precursor into the active catalyst, which is useful for the design and synthesis of other materials.

Graphical abstract: In situ transformation of a Bi-based MOF to a highly active catalyst for CO2 reduction

Supplementary files

Article information

Article type
Paper
Submitted
15 May 2024
Accepted
31 Jul 2024
First published
01 Aug 2024

New J. Chem., 2024,48, 15112-15119

In situ transformation of a Bi-based MOF to a highly active catalyst for CO2 reduction

C. Liu, Z. Wu, Y. Li, H. Yu, S. Chen, W. Hong, S. Deng and J. Wang, New J. Chem., 2024, 48, 15112 DOI: 10.1039/D4NJ02279C

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