{"title":"Lewis Acid Sites in Hollow Cobalt Phytate Micropolyhedra Promote the Electrocatalytic Water Oxidation.","authors":"Jing Qi, Qizhen Chen, Ying Gao, Yajing Zhao, Shengbo Gao, Enbo Shangguan, Mingxing Chen","doi":"10.1002/cssc.202401932","DOIUrl":null,"url":null,"abstract":"<p><p>The acid-base microenvironment of the metal center is crucial for constructing advanced oxygen evolution reaction (OER) electrocatalysts. However, the correlation between acidic site and OER performance remains unclear for cobalt-based catalysts. Herein, Lewis acid sites in hollow cobalt phytate micropolyhedra (M-CoPA, M = Cu, Sr) were synthesized by a cation-exchange strategy, and their OER performances were studied systematically. Experimentally, Lewis acid Cu<sup>2+</sup> sites with stronger Lewis acidity exhibited superior intrinsic activity and long-term stability in alkaline electrolytes. The spectroscopic and electrochemical studies show Lewis acid sites in hollow cobalt phytate micropolyhedra can modulate the electronic distribution of the adjacent cobalt center and further optimize the adsorption strength of oxygenated species. This study figures out the effect of Lewis acid sites on the OER kinetics and provides an effective way to develop high-efficiency electrocatalysts for energy conversion systems.</p>","PeriodicalId":149,"journal":{"name":"ChemSusChem","volume":" ","pages":"e202401932"},"PeriodicalIF":7.5000,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ChemSusChem","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1002/cssc.202401932","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The acid-base microenvironment of the metal center is crucial for constructing advanced oxygen evolution reaction (OER) electrocatalysts. However, the correlation between acidic site and OER performance remains unclear for cobalt-based catalysts. Herein, Lewis acid sites in hollow cobalt phytate micropolyhedra (M-CoPA, M = Cu, Sr) were synthesized by a cation-exchange strategy, and their OER performances were studied systematically. Experimentally, Lewis acid Cu2+ sites with stronger Lewis acidity exhibited superior intrinsic activity and long-term stability in alkaline electrolytes. The spectroscopic and electrochemical studies show Lewis acid sites in hollow cobalt phytate micropolyhedra can modulate the electronic distribution of the adjacent cobalt center and further optimize the adsorption strength of oxygenated species. This study figures out the effect of Lewis acid sites on the OER kinetics and provides an effective way to develop high-efficiency electrocatalysts for energy conversion systems.
金属中心的酸碱微环境对于构建先进的氧进化反应（OER）电催化剂至关重要。然而，对于钴基催化剂来说，酸性位点与 OER 性能之间的相关性仍不清楚。本文采用阳离子交换策略合成了空心植酸钴微多面体（M-CoPA，M = Cu、Sr）中的路易斯酸位点，并对其 OER 性能进行了系统研究。实验结果表明，路易斯酸性较强的 Cu2+ 位点在碱性电解质中表现出优异的内在活性和长期稳定性。光谱和电化学研究表明，中空植酸钴微多面体中的路易斯酸位点可以调节相邻钴中心的电子分布，进一步优化含氧物种的吸附强度。这项研究阐明了路易斯酸位点对 OER 动力学的影响，为开发能量转换系统的高效电催化剂提供了有效途径。
期刊介绍：
ChemSusChem
Impact Factor (2016): 7.226
Scope:
Interdisciplinary journal
Focuses on research at the interface of chemistry and sustainability
Features the best research on sustainability and energy
Areas Covered:
Chemistry
Materials Science
Chemical Engineering
Biotechnology
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