The oxygen evolution reaction(OER)plays a crucial role as the anode reaction of electrolytic water splitting in various applications.To date,it is still a great challenge to develop highly active and durable electroca...The oxygen evolution reaction(OER)plays a crucial role as the anode reaction of electrolytic water splitting in various applications.To date,it is still a great challenge to develop highly active and durable electrocatalysts for acidic electrolytic water splitting.Herein,we highlight an effective strategy to regulate the oxidation state of Ru species and oxygen vacancies in RuO_(2)by introducing Sr heteroatoms into its lattice based on the principle of charge equilibrium.The as-prepared Sr_(0.1)RuO_(x)catalyst exhibits excellent OER activity with an overpotential of 201 mV at a current density of 10 mA cm^(-2),which is attributed to the higher proportion of Ru^(4+)induced by Sr doping.Moreover,both experimental and theoretical calculations revealed that the introduced oxygen vacancies inhibited the overoxidation of Ru to Ru^(n>4+)during the OER process,thus enhancing the stability of Sr_(0.1)RuO_(x).Therefore,the PEM electrolyzer using Sr_(0.1)RuO_(x)as the anode catalyst can be operated for 240 hours at 10 mA cm^(-2)without obvious attenuation.This work presents an effective strategy to regulate the structure of OER electrocatalysts with excellent performance.展开更多
基金supported by China Postdoctoral Science Foundation(No.2022M712501)Shaanxi Fundamental Science Research Project for Mathematics and Physics(Grant No.22JSQ004)+1 种基金Shccig-Qinling Program,the Innovation Capability Support Program of Shaanxi Province(2023-CX-TD-49)the China Fundamental Research Funds for the Central Universities,and the World-Class Universities and the Characteristic Development Guidance Funds for the Central Universities.
文摘The oxygen evolution reaction(OER)plays a crucial role as the anode reaction of electrolytic water splitting in various applications.To date,it is still a great challenge to develop highly active and durable electrocatalysts for acidic electrolytic water splitting.Herein,we highlight an effective strategy to regulate the oxidation state of Ru species and oxygen vacancies in RuO_(2)by introducing Sr heteroatoms into its lattice based on the principle of charge equilibrium.The as-prepared Sr_(0.1)RuO_(x)catalyst exhibits excellent OER activity with an overpotential of 201 mV at a current density of 10 mA cm^(-2),which is attributed to the higher proportion of Ru^(4+)induced by Sr doping.Moreover,both experimental and theoretical calculations revealed that the introduced oxygen vacancies inhibited the overoxidation of Ru to Ru^(n>4+)during the OER process,thus enhancing the stability of Sr_(0.1)RuO_(x).Therefore,the PEM electrolyzer using Sr_(0.1)RuO_(x)as the anode catalyst can be operated for 240 hours at 10 mA cm^(-2)without obvious attenuation.This work presents an effective strategy to regulate the structure of OER electrocatalysts with excellent performance.
