Multigrain Ruthenium Nanocrystals with Enriched (101¯${{\bar{1}}}$1) Facets for Enhanced Hydrogen Oxidation in Anion Exchange Membrane Fuel Cells
Abstract
AbstractRuthenium‐based materials are promising alternatives to expensive platinum for the anodic hydrogen oxidation reaction (HOR) in anion exchange membrane fuel cells (AEMFCs), but face stability issues due to the strong oxophilicity. Here, an oxidation‐resistant ruthenium multigrain catalyst is reported that exposes rich (101) facets for high‐performing HOR catalysis in alkaline electrolytes. The catalyst exhibits a high kinetic current density of 61 mA cm−2 at an overpotential of 50 mV, which is 25.6‐ and 7.8‐times higher than that of commercial ruthenium‐carbon and platinum‐carbon catalysts, respectively. Moreover, it also demonstrates a wide stability window up to 0.3 V versus the reverse hydrogen electrode and enhanced tolerance to carbon monoxide. An AEMFC containing this catalyst at the anode achieves peak power densities of 1.31 and 1.06 W cm−2 under hydrogen‐oxygen and hydrogen‐air conditions at 90 °C, respectively, and operates steadily. Experimental and theoretical studies reveal that the (101) facet possesses a higher oxidation barrier and lower hydrogen oxidation barrier than the common (0002) facets, enabling the exceptional HOR performances in alkali.
Article Details
Authors (16)
Xiandi Sun
School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Value‐Added Catalytic Conversion and Reaction Engineering Anhui Province Engineering Research Center of Flexible and Intelligent Materials Hefei University of Technology Hefei Anhui 230009 China
Jiashun Wu
Tao Wang
Xiao‐Long Zhang
Division of Nanomaterials & Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 P.R. China
Pei Liu
Graphene Composite Research Center, College of Chemistry and Environmental Engineering
Hongyu Sun
Department of Gastroenterology, the First Medical Center, Chinese PLA General Hospital, Beijing 100700, P. R. China
Hang Liu
Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay
Siyu Chen
Jinan University ,
Jia Ge
Tianrui Liu
State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering
Haibing Wei
Chuan‐Ling Zhang
School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Value‐Added Catalytic Conversion and Reaction Engineering Anhui Province Engineering Research Center of Flexible and Intelligent Materials Hefei University of Technology Hefei Anhui 230009 China
Huai‐Ping Cong
Anhui Province Engineering Research Center of Flexible and Intelligent Materials School of Chemistry and Chemical Engineering Hefei University of Technology Hefei P.R. China
Zhenbin Wang
Department of Materials Science and Engineering
Ya‐Rong Zheng
School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Value‐Added Catalytic Conversion and Reaction Engineering Anhui Province Engineering Research Center of Flexible and Intelligent Materials Hefei University of Technology Hefei Anhui 230009 China
Min‐Rui Gao
Division of Nanomaterials & Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 P.R. China