Ru-RuO2 nano-heterostructures stabilized by the sacrificing oxidation strategy of Mn3O4 substrate for boosting acidic oxygen evolution reaction

Xin Long, Bin Zhao, Qianqian Zhao, Xuexian Wu, Meng-Nan Zhu, Renfei Feng, Mohsen Shakouri, Yu Zhang, Xinxin Xiao, Jiujun Zhang, Xian-Zhu Fu, Jing-Li Luo

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Designing anodic electrocatalysts with high activity and robust stability for acidic oxygen evolution reaction (OER) is significant for the large-scale promotion of sustainable proton exchange membrane water electrolysis (PEMWE). Most reported Ru-based electrocatalysts tend to further improve activity at the expense of stability. Herein, we report the synthesis of crystalline Mn 3O 4 supported Ru-RuO 2 nano-heterostructures as the anodic electrocatalyst that only requires a low overpotential of 182 mV (10 mA cm −2) for acidic OER, accompanied with a record stability of 400 h in 0.5 M H 2SO 4. The results of XPS, ICP-MS, and XAS indicate that the Mn 3O 4 substrate plays a crucial role in stabilizing Ru-RuO 2 nano-heterostructure by preventing Ru from over-oxidation and dissolution. Meanwhile, DEMS with isotope labeling reveals that the Ru-RuO 2 nano-heterostructure contributes to suppressing lattice oxygen oxidation mechanism (LOM) and concurrently expediting the involvement of adsorbate evolution mechanism (AEM) for boosting the acidic OER performance.

Original languageEnglish
Article number123559
JournalApplied Catalysis B: Environmental
Volume343
Pages (from-to)123559
Number of pages1
ISSN0926-3373
DOIs
Publication statusPublished - Apr 2024

Keywords

  • MnO substrate
  • Ru-based electrocatalysts
  • acidic OER
  • heterostructure
  • stability

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