Publications

Metal–Organic-Framework-Supported Molecular Electrocatalysis for the Oxygen Reduction Reaction

Liang, Z. and Guo, H. and Zhou, G. and Guo, K. and Wang, B. and Lei, H. and Zhang, W. and Zheng, H. and Apfel, U.-P. and Cao, R.

ANGEWANDTE CHEMIE - INTERNATIONAL EDITION
Volume: 60 Pages: 8472-8476
DOI: 10.1002/anie.202016024
Published: 2021

Abstract
Synthesizing molecule@support hybrids is appealing to improve molecular electrocatalysis. We report herein metal–organic framework (MOF)-supported Co porphyrins for the oxygen reduction reaction (ORR) with improved activity and selectivity. Co porphyrins can be grafted on MOF surfaces through ligand exchange. A variety of porphyrin@MOF hybrids were made using this method. Grafted Co porphyrins showed boosted ORR activity with large (>70 mV) anodic shift of the half-wave potential compared to ungrafted porphyrins. By using active MOFs for peroxide reduction, the number of electrons transferred per O2 increased from 2.65 to 3.70, showing significantly improved selectivity for the 4e ORR. It is demonstrated that H2O2 generated from O2 reduction at Co porphyrins is further reduced at MOF surfaces, leading to improved 4e ORR. As a practical demonstration, these hybrids were used as air electrode catalysts in Zn-air batteries, which exhibited equal performance to that with Pt-based materials. © 2021 Wiley-VCH GmbH

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