Anomalous pH‐Dependence of Ru for Hydrogen Electrochemistry
Abstract
Abstract The essence of the classic pH‐dependent catalytic behavior of Pt toward hydrogen electrochemistry has been debated for decades. In stark contrast, Ru represents a unique exception by exhibiting intrinsically anomalous pH dependence among Pt‐group metals, significantly challenging the universal validity of the existing mechanistic system derived from classic pH effects. To decode the chemical essence beneath the unique anomalous pH dependence, refined multidimensional structural characterizations and electrical transport spectroscopic studies reveal that the electron delocalization on Ru surface enables strong oxophilicity and unique pH‐dependent coverage of OH*, essentially different from the H*‐dominated Pt surface. The enriched OH* breaks the classic pH‐dependent rule by forming hydrogen bond‐regulated interfacial water structures, thus creating a unique chemical environment for alkaline hydrogen catalysis. By clearly decoding the anomalous pH‐dependent behavior of Ru, our work provides new chances to improve the physicochemical model for re‐understanding hydrogen electrochemistry.
Article Details
Authors (14)
Yanyan Fang
State Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei Anhui 230026 P.R. China
Cong Wei
Tianshu Liu
Department of Medical Oncology, Zhongshan Hospital, Fudan University, Shanghai
Chongyang Tang
Zhaohui Liu
Xuanwei Yin
State Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei Anhui 230026 P.R. China
Bo Liu
Zhangyan Mu
Zenan Bian
State Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei Anhui 230026 P.R. China
Junxin Xiao
State Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei Anhui 230026 P.R. China
Peng Chi
State Key Laboratory of Precision and Intelligent Chemistry University of Science and Technology of China Hefei Anhui 230026 P.R. China
Mengning Ding
State Key Laboratory of Coordination Chemistry, Key Laboratory of Mesoscopic Chemistry of MOE, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering
Changzheng Wu
State Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science
Gongming Wang
State Key Laboratory of Precision and Intelligent Chemistry, School of Chemistry and Materials Science