journal article·2026-01

Crystal Phase‐Dependent Performance of RuO x /MnO 2 Nanorods for Alkaline Oxygen Evolution Reaction

Tingting Pan, Wei‐Hsiang Huang, Hongyuan Jie, Min‐Hsin Yeh, Kangshu Li, Meixin Chen, Xiaoyan Zhou, Jingjie Ge, Xuning Li, Xiaoxu Zhao, Zhiwei Hu, Yipu Liu, Jiwei Ma, Hongfei Cheng

Advanced Functional Materials· Volume 36· Issue 7
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Abstract

Abstract MnO 2 is a widely studied non‐noble metal electrocatalyst for the oxygen evolution reaction (OER) and has demonstrated phase‐dependent performance. Among the various MnO 2 polymorphs, γ‐MnO 2 has abundant defects and vacancies due to its disordered crystal structure of both β‐MnO 2 and R‐MnO 2 intergrowth, thus being a potential high‐performance OER catalyst. However, γ‐MnO 2 has been studied much less than other crystal phases of MnO 2 , and γ‐MnO 2 ‐based heterostructures are rarely reported. In this study, it is discovered that γ‐phase plays a unique role in RuO x /MnO 2 heterostructured nanorods. Among the pristine α‐, β‐, and γ‐MnO 2 polymorphs, α‐phase shows the best OER activity; however, after loading RuO x nanoclusters, RuO x /γ‐MnO 2 shows the largest enhancement and hence the best OER activity with an overpotential of 255 mV at 10 mA cm −2 and excellent stability (> 300 h), which is much superior to the commercial RuO 2 catalyst. Furthermore, when tested in an anion exchange membrane water electrolyzer (AEMWE), it maintains excellent durability at 200 mA cm −2 over 380 h. Mechanistic study shows that RuO x /γ‐MnO 2 exhibits the strongest electron transfer between Ru and Mn, which significantly weakens the Mn‐O bond strength and reduces the interaction between intermediates and the MnO 2 surface, ultimately resulting in the lowest energy barrier for the reaction.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Fuel Cells and Related Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials Institute of New Energy for Vehicles School of Materials Science and Engineering Tongji University Shanghai 201804 P. R. China

National Synchrotron Radiation Research Center (NSRRC) Hsinchu 300092 Taiwan

Sustainable Electrochemical Energy Development (SEED) Center National Taiwan University of Science and Technology Taipei 106 Taiwan

School of Materials Science and Engineering Key Laboratory of Pico Electron Microscopy of Hainan Province Hainan University Haikou 570228 P. R. China

Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 10607 Taiwan

School of Materials Science and Engineering Peking University Beijing 100871 P. R. China

State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China

University of Chinese Academy of Sciences Beijing 100049 P. R. China

Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom, Kowloon Hong Kong P.R. China

Max Planck Institute for Chemical Physics of Solids Nöthnitzer Strasse 40 01187 Dresden Germany

Funding

National Natural Science Foundation of China · Natural Science Foundation of Shanghai Municipality · National Key Research and Development Program of China · Natural Science Foundation of Beijing Municipality

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