Durable Ru Nanocrystal with HfO_(2)Modification for Acidic Overall Water Splitting  

作　　者：Xiangkai Kong Jie Xu Zhicheng Ju Changle Chen 

机构地区：[1]School of Materials and Physics,China University of Mining and Technology,Xuzhou 221116,Jiangsu,People’s Republic of China [2]Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation,Huaibei Normal University,Huaibei 235000,Anhui,People’s Republic of China [3]School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,Anhui,People’s Republic of China [4]School of Chemistry and Chemical Engineering,Nanjing University,Nanjing 210023,Jiangsu,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第9期462-477,共16页纳微快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.22279162,22261142664);Natural Science Fund for Colleges and Universities in Anhui Province(2022AH030057);CAS Project for Young Scientists in Basic Research(No.YSBR-094).

摘　　要：Durable and efficient bi-functional catalyst,that is capable of both oxygen evolution reaction and hydrogen evolution reaction under acidic condition,are highly desired for the commercialization of proton exchange membrane water electrolysis.Herein,we report a robust L-Ru/HfO_(2)heterostructure constructed via confining crystalline Ru nanodomains by HfO_(2)matrix.When assembled with a proton exchange membrane,the bi-functional L-Ru/HfO_(2)catalyst-based electrolyzer presents a voltage of 1.57 and 1.67 V to reach 100 and 300 mA cm^(-2)current density,prevailing most of previously reported Ru-based materials as well as commercial Pt/C||RuO_(2)electrolyzer.It is revealed that the synergistic effect of HfO_(2)modification and small crystalline domain formation significantly alleviates the over-oxidation of Ru.More importantly,this synergistic effect facilitates a dual-site oxide path during the oxygen evolution procedure via optimization of the binding configurations of oxygenated adsorbates.As a result,the Ru active sites maintain the metallic state along with reduced energy barrier for the rate-determining step(^(*)O→^(*)OOH).Both of water adsorption and dissociation(Volmer step)are strengthened,while a moderate hydrogen binding is achieved to accelerate the hydrogen desorption procedure(Tafel step).Consequently,the activity and stability of acidic overall water splitting are simultaneously enhanced.

关 键 词：RUTHENIUM Hafnium dioxide Oxygen evolution catalysis ANTI-OXIDATION 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学]