Issue 20, 2023

Holistic functional biomimetics: a key to make an efficient electrocatalyst for water oxidation

Abstract

Water oxidation is the holy grail reaction of natural and artificial photosynthesis. How to design an efficient water-oxidation catalyst remains a long-term challenge for solar fuel production. The rate of water oxidation in photosystem II by the oxygen-evolving complex (OEC) Mn4CaO5 cluster is as high as 100–400 s−1. Mimicking the structures of the OEC is a straightforward strategy to design water-oxidation catalysts. However, the high efficiency of the OEC relies on not only its highly active site but also its holistic system for well-organized electron transfer and proton transport. Lacking such a holistic functional system makes δ-MnO2 a poor water-oxidation catalyst, although the local structure of δ-MnO2 is similar to that of the Mn4CaO5 cluster. Electrocatalysts simultaneously imitating the catalytically active sites, fast electron transfer, and promoted proton transport in a natural OEC have been rarely reported. The significance of the synergy of a holistic system is underrated in the design of water-oxidation catalysts. In this work, we fabricated holistic functional biomimetic composites of two-dimensional manganese oxide nanosheets and pyridyl-modified graphene (MnOx-NS/py-G) for electrocatalytic water oxidation. MnOx-NS/py-G simultaneously imitates the synergy of catalytically active sites, fast electron transfer, and promoted proton transport in a natural OEC, resulting in overall 600 times higher activity than that of typical δ-MnO2. This work demonstrates the significance of holistic functional biomimetic design and guides the development of highly active electrocatalysts for small molecule activation related to solar energy storage.

Graphical abstract: Holistic functional biomimetics: a key to make an efficient electrocatalyst for water oxidation

Supplementary files

Article information

Article type
Paper
Submitted
19 fev 2023
Accepted
19 apr 2023
First published
20 apr 2023
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. A, 2023,11, 10669-10676

Holistic functional biomimetics: a key to make an efficient electrocatalyst for water oxidation

L. Fan, Y. Song, F. Zhang, B. J. J. Timmer, A. Kravberg, B. Zhang and L. Sun, J. Mater. Chem. A, 2023, 11, 10669 DOI: 10.1039/D3TA01040F

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