Polyoxometalated metal-organic framework superstructure for stable water oxidation

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-04-24 DOI:10.1126/science.ads1466

Kaihang Yue, Ruihu Lu, Mingbin Gao, Fei Song, Yao Dai, Chenfeng Xia, Bingbao Mei, Hongliang Dong, Ruijuan Qi, Daliang Zhang, Jiangwei Zhang, Ziyun Wang, Fuqiang Huang, Bao Yu Xia, Ya Yan

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引用次数: 0

Abstract

Stable, nonprecious catalysts are vital for large-scale alkaline water electrolysis. Here, we report a grafted superstructure, MOF@POM, formed by self-assembling a metal-organic framework (MOF) with polyoxometalate (POM). In situ electrochemical transformation converts MOF into active metal (oxy)hydroxides to produce a catalyst with a low overpotential of 178 millivolts at 10 milliamperes per square centimeter in alkaline electrolyte. An anion exchange membrane water electrolyzer incorporating this catalyst achieves 3 amperes per square centimeter at 1.78 volts at 80°C and stable operation at 2 amperes per square centimeter for 5140 hours at room temperature. In situ electrochemical spectroscopy and theoretical studies reveal that the synergistic interactions between metal atoms create a fast electron-transfer channel from catalytic iron and cobalt sites, nickel, and tungsten in the polyoxometalate to the electrode, stabilizing the metal sites and preventing dissolution.

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多金属氧化金属-有机骨架上层结构，用于稳定水氧化

稳定的、非贵重的催化剂对于大规模碱水电解至关重要。在这里，我们报道了一个接枝的上层结构，MOF@POM，由金属有机框架（MOF）与多金属氧酸盐（POM）自组装形成。原位电化学转化将MOF转化为活性金属（氧）氢氧化物，在碱性电解质中产生过电位低至178毫伏，每平方厘米10毫安的催化剂。含有该催化剂的阴离子交换膜水电解槽在80°C下在1.78伏特下达到每平方厘米3安培，在室温下稳定运行在每平方厘米2安培5140小时。原位电化学光谱和理论研究表明，金属原子之间的协同作用创造了一个快速的电子转移通道，从多金属氧酸盐中的催化铁和钴位点、镍和钨到电极，稳定了金属位点并防止了溶解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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