Photo‐Activating Biomimetic Polyoxomolybdate for Boosting Oxygen Evolution in Neutral Electrolytes

Author:

Li Da‐Huan1,Zhang Xiao‐Yue1,Lv Jiang‐Quan2,Cai Ping‐Wei1,Sun Yan‐Qiong1,Sun Cai1ORCID,Zheng Shou‐Tian1ORCID

Affiliation:

1. Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated-Materials College of Chemistry Fuzhou University Fuzhou Fujian 350108 China

2. College of Electronics and Information Science Fujian Jiangxia University Fuzhou Fujian 350108 China

Abstract

AbstractInspired by the metal‐oxo cluster structural feature and charge separation behaviour of the oxygen evolving center (OEC) in photosystem II (PS‐II) under photoirradiation, a new crystalline photochromic polyoxomolybdate, MV2[β‐Mo8O26] (1, MV=methyl viologen cation), is designed as a biomimetic oxygen evolution reaction (OER) catalyst in neutral electrolytes. After photoinduced electron transfer (PIET) with colour change from colourless to grey, it remains in an ultra‐stable charge‐separated state over a year under ambient conditions. The observed overpotential at 10 mA ⋅ cm−2 and Tafel slope decrease by 49 mV and 62.8 mV ⋅ dec−1 after coloration, respectively. The outstanding OER performance of the coloured state in neutral electrolytes even outperforms the commercial RuO2 benchmark. Experimental and theoretical studies show that oxygen holes within polyanions after irradiation serve as sites for enhancing direct O−O coupling, thus effectively promoting OER. This is the first successful application of electron‐transfer photochromism to realize OER activity gain.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry,Catalysis

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