Synergistic Ru/RuO_(2) heterojunctions stabilized by carbon coating as efficient and stable bifunctional electrocatalysts for acidic overall water splitting  

作　　者：Man Wu Yuying Fan Yang Huang Dongxu Wang Ying Xie Aiping Wu Chungui Tian 

机构地区：[1]Key Laboratory of Functional Inorganic Material Chemistry,Ministry of Education of the People’s Republic of China,Heilongjiang University,Harbin 150080,China

出　　处：《Nano Research》2024年第8期6931-6939,共9页纳米研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFA1503002);the National Natural Science Foundation of China(Nos.22271081 and 91961111);the Natural Science Foundation of Heilongjiang Province(No.ZD2021B003);the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province(No.UNPYSCT-2020004);the Heilongjiang University Excellent Youth Foundation.

摘　　要：The development of highly active and stable acidic water oxidation electrocatalysts is of great significant for promoting the industrial application of proton exchange membrane electrolyzers.Ru-based catalysts have broad application prospects in acidic water oxidation,but their limitations in stability and activity hinder their further application.Herein,a nitrogen-doped carbon(NC)coated porous Ru/RuO_(2) heterojunctional hollow sphere(Ru/RuO_(2)/NC)is designed as high-active and stable bifunctional electrocatalyst for acidic oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).In synthesis,the key is to use mesoporous polydopamine spheres as a template for forming hollow spheres,a source of NC coating and a reducing agent for forming Ru/RuO_(2) heterojunction.The Ru/RuO_(2) heterojunction adjusts the electronic structure of Ru active sites,optimizing the adsorption of intermediate species.Furthermore,the NC coating and the interaction between NC and Ru/RuO_(2) effectively prevent Ru from over-oxidation and dissolution.The porous hollow structure provides more exposed active sites and promotes mass transfer.Impressively,Ru/RuO_(2)/NC exhibits outstanding OER and HER performance with low overpotentials of 211 and 32 mV at 10 mA·cm^(−2),respectively,and shows excellent stability.The acid water splitting electrolyzer,based on the bifunctional Ru/RuO_(2)/NC,requires low cell voltages of 1.46 and 1.76 V at 10 and 100 mA·cm^(−2),respectively,with good stability for over 100 h operation,surpassing Pt/C||RuO_(2) and most of the reported catalysts.

关 键 词：hollow heterojunction bifunctional electrocatalysts oxygen evolution hydrogen evolution acidic water splitting 

分 类 号：O64[理学—物理化学]