Article, 2024

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

Applied Catalysis B Environmental, ISSN 1873-3883, 0926-3373, Volume 343, Page 123559, 10.1016/j.apcatb.2023.123559

Contributors

Long, Xin [1] Zhao, Bin 0000-0002-6206-2018 (Corresponding author) [1] Zhao, Qianqian [1] Wu, Xuexian [1] Zhu, Meng-Nan 0000-0002-1313-3692 [2] Feng, Ren-Fei 0000-0001-8566-4161 [3] Shakouri, Mohsen 0000-0002-8449-9763 [3] Zhang, Yu [1] Xiao, Xinxin 0000-0002-0240-0038 [4] Zhang, Jiujun 0000-0003-1338-8887 [5] Fu, Xian-Zhu [1] Luo, Jing-Li (Corresponding author) [1]

Affiliations

  1. [1] Shenzhen University
    2. [NORA names: China; Asia, East];
  2. [2] University of Alberta
    3. [NORA names: Canada; America, North; OECD];
  3. [3] Canadian Light Source (Canada)
    4. [NORA names: Canada; America, North; OECD];
  4. [4] Aalborg University
    5. [NORA names: AAU Aalborg University; University; Denmark; Europe, EU; Nordic; OECD];
  5. [5] Shanghai University
    6. [NORA names: China; Asia, East]

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 Mn3O4 supported Ru-RuO2 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 H2SO4. The results of XPS, ICP-MS, and XAS indicate that the Mn3O4 substrate plays a crucial role in stabilizing Ru-RuO2 nano-heterostructure by preventing Ru from over-oxidation and dissolution. Meanwhile, DEMS with isotope labeling reveals that the Ru-RuO2 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.

Keywords

DEM, ICP-MS, Mn3O4, OER performance, Ru-based electrocatalysts, XAS, XPS, acidic OER performance, acidic oxygen evolution reaction, activity, adsorbate evolution mechanism, anode electrocatalyst, crystalline Mn3O4, dissolution, electrocatalysts, electrolysis, evolution mechanism, evolution reaction, expense, expense of stability, involvement, isotope labeling, isotopes, labeling, large-scale promotion, lattice oxygen oxidation mechanism, low overpotential, mechanism, nano-heterostructures, over-oxidation, overpotential, oxidation mechanism, oxidation strategy, oxygen evolution reaction, performance, promoter, proton, proton exchange membrane water electrolysis, reaction, recording stability, records, results, results of XPS, robust stability, stability, strategies, substrate, synthesis, water electrolysis

Funders

  • National Natural Science Foundation of China

Data Provider: Digital Science

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