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Homogeneous Catalytic Process of a Heterogeneous Ru Catalyst in Li-O2 via X-ray Nanodiffraction Observation.
Liao, Chung-Hao; Chiang, Ching-Yu; Iputera, Kevin; Hu, Shu-Fen; Liu, Ru-Shi.
Afiliação
  • Liao CH; Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan.
  • Chiang CY; National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.
  • Iputera K; Department of Chemistry and Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 106, Taiwan.
  • Hu SF; Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan.
  • Liu RS; Department of Chemistry and Advanced Research Center for Green Materials Science and Technology, National Taiwan University, Taipei 106, Taiwan.
ACS Appl Mater Interfaces ; 16(7): 8783-8790, 2024 Feb 21.
Article em En | MEDLINE | ID: mdl-38335216
ABSTRACT
In recent years, lithium oxygen batteries (Li-O2) have received considerable research attention due to their extremely high energy density. However, the poor conductivity and ion conductivity of the discharge product lithium peroxide (Li2O2) result in a high charging overpotential, poor cycling stability, and low charging rate. Therefore, studying and improving catalysts is a top priority. This study focuses on the commonly used heterogeneous catalyst ruthenium (Ru). The local distribution of this catalyst is controlled by using sputtering technology. Moreover, X-ray nanodiffraction is applied to observe the relationship between the decomposition of Li2O2 and the local distribution of Ru. Results show that Li2O2 decomposes homogeneously in liquid systems and heterogeneously in solid-state systems. This study finds that the catalytic effect of Ru is related to electrolyte decomposition and that its soluble byproducts act as electron acceptors or redox mediators, effectively reducing charging overpotential but also shortening the cycle life.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Taiwan

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Taiwan