2D CaWO_(4)nanosheets derived from scheelite minerals for enhanced electrocatalysis in oxygen evolution reaction

作     者：Qing Sun Yongxiang Sun Yan Dong Hong Zhong Hongbo Zeng 

作者机构：National&Local United Engineering Laboratory for New Petrochemical Materials&Fine Utilization of ResourcesCollege of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081China Department of Chemical and Materials EngineeringUniversity of AlbertaEdmonton T6G 1H9Canada College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China College of Chemistry and Materials EngineeringHunan University of Arts and ScienceChangde 415000China 

出 版 物：《Science China Chemistry》 (中国科学(化学英文版))

年 卷 期：2025年第68卷第5期

页      面：2170-2177页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(51774329) the High-Performance Computing Center of Central South University(to Zhong H) the Natural Sciences and Engineering Research Council of Canada(NSERC) the Canada Foundation for Innovation(CFI) the Canada Research Chairs Program(to Zeng H) supported by the China Scholarship Council(202106370093) 

主　　题：scheelite mineral two-dimensional nanosheets electrocatalysis oxygen evolution reaction 

摘      要：Scheelite(CaWO_(4))mineral holds promise as a cost-effective and efficient catalyst for the oxygen evolution reaction(OER)crucial in renewable energy ***,challenges such as limited active site exposure and low electrocatalytic performance need *** this work,we have fabricated two-dimensional(2D)CaWO_(4)nanosheets from scheelite minerals via a straightforward ultrasonic exfoliation method and evaluated their efficacy as OER *** to scheelite powders,these 2D nanosheets exhibited superior crystallinity and a 1.26-fold increase in electrochemical surface area,promoting active site *** 2D CaWO_(4)nanosheet electrode demonstrated outstanding OER catalytic performance,achieving a current density of 20 mA/cm^(2)at an overpotential of 290 mV in alkaline conditions,which was lower than that of bulk CaWO_(4)electrodes(~340 mV).Density functional theory calculations attributed this enhanced catalytic performance to moderate adsorption of oxygenated intermediates(*OH,*O,and*OOH)on the W sites of 2D CaWO_(4)*** situ electrochemical atomic force microscopy tests also confirmed the catalytic enhancement by 2D CaWO_(4)nanosheets during *** findings demonstrate the potential of affordable and abundant mineral resources in advancing electrochemical catalysts for oxygen evolution,highlighting their broader application in sustainable energy technologies.