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Article Dans Une Revue Nature Catalysis Année : 2024

Stabilization of layered lithium-rich manganese oxide for anion exchange membrane fuel cells and water electrolysers

Xuepeng Zhong
  • Fonction : Auteur
Lijun Sui
  • Fonction : Auteur
Menghao Yang
Jiwei Ma
Toshinari Koketsu
  • Fonction : Auteur
Malte Klingenhof
  • Fonction : Auteur
Peter Strasser
Sören Selve
  • Fonction : Auteur
Chuangxin Ge
  • Fonction : Auteur
Lin Zhuang
Wang Hay Kan
  • Fonction : Auteur
Maxim Avdeev
  • Fonction : Auteur
Miao Shu
  • Fonction : Auteur
Nicolas Alonso-Vante
Jin Ming Chen
  • Fonction : Auteur
Shu Chih Haw
  • Fonction : Auteur
Chih Wen Pao
Yu Chung Chang
  • Fonction : Auteur
Yunhui Huang
Zhiwei Hu

Résumé

© The Author(s), under exclusive licence to Springer Nature Limited 2024. corrected publication 2024.The design of materials that efficiently catalyse the electrochemical reaction of molecular oxygen to hydroxide ions is key to the development of electrochemical devices. Here we demonstrate an approach to control the orbital hybridization of 3d and 4d/5d metals to tune the adsorption strength and stabilize the catalytic sites in the platinum-free catalysts Li2Mn1−xRuxO3. We show that in these materials, the stabilization of O 2p holes by changing the Mu2013O covalency (M = 4d/5d metal) can help to mitigate structural instability. Operando X-ray absorption spectroscopy revealed that the Mn and Ru atoms are the active sites for the oxygen reduction reaction (ORR) and exhibit a high ORR activity with noteworthy stability compared with the Pt/C catalyst and outperform NiFe layered double hydroxides and RuO2 in the oxygen evolution reaction. Notably, Li2Mn0.85Ru0.15O3 shows a high power density of 1.2 W cm−2 and current density of 1.2 A cm−2 at 1.9 V in the anion exchange membrane fuel cell and water electrolyser, respectively. (Figure presented.)

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Chimie
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Dates et versions

hal-04626782 , version 1 (27-06-2024)

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Xuepeng Zhong, Lijun Sui, Menghao Yang, Jiwei Ma, Toshinari Koketsu, et al.. Stabilization of layered lithium-rich manganese oxide for anion exchange membrane fuel cells and water electrolysers. Nature Catalysis, 2024, 7 (5), pp.546-559. ⟨10.1038/s41929-024-01136-1⟩. ⟨hal-04626782⟩
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