Twisted Ru Homostructures Enable High‐Efficiency Alkaline Hydrogen Oxidation Reaction
Abstract
ABSTRACT Designing potential catalysts for the alkaline hydrogen oxidation reaction (HOR) to replace Pt is crucial for the development of anion exchange membrane fuel cells (AEMFCs). Ru‐based catalysts especially heterostructures are considered to be the most promising alternatives to Pt. However, the activity of Ru‐based heterostructures still falls short of displacing commercial Pt‐based catalysts, primarily due to their limited number of high‐activity sites and high energy barriers for intermediate migration near the interface. Herein, we designed an efficient HOR catalyst on the basis of twisted Ru homostructures. The stress effect and coordination deficiencies generated at the grain boundaries of twisted Ru homostructures could simultaneously optimize the thermodynamics and increase the migration kinetics of intermediates (H* and OH*), effectively overcoming the inherent drawbacks associated with heterostructure catalysts. Owing to the unique electronic structure of the twisted homostructures, our catalyst demonstrated exceptional alkaline HOR catalytic performance ( j k = 77.2 mA cm −2 @ 50 mV). When evaluated in the fuel cell configuration, the catalyst achieves a record peak power density of 1.81 W cm −2 , surpassing commercial PtRu/C (1.36 W cm −2 ) and Pt/C (1.23 W cm −2 ), representing the highest performance among reported pure metallic catalysts.
Article Details
Authors (13)
Jiahe Yang
Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science
Dingge Fan
Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science
Zhiyu Cheng
School of Environment and Civil Engineering Research Institute of Interdisciplinary Science Dongguan University of Technology Dongguan Guangdong 523808 P.R. China
Yang Yang
Peichen Wang
Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science University of Science and Technology of China Hefei 230026 P.R. China
Pin Meng
Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science
Hongda Shi
Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science
Pengcheng Wang
Institute of Functional Nano & Soft Materials & Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO−CIC)
Yunlong Zhang
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhongshan Road 457, Dalian 116023, China
Xingyan Chen
Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science
Cichang Zong
Hefei National Research Center for Physical Sciences at the Microscale and Department of Materials Science and Engineering University of Science and Technology of China Hefei China
Dongdong Wang
Qianwang Chen
Hefei National Research Center for Physical Sciences at the Microscale and School of Chemistry and Materials Science