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High-Performance Azo Cathodes Enabled by N-Heteroatomic Substitution for Zinc Batteries with a Self-Charging Capability.
Du, Dawei; Chen, Yuqi; Zhang, Hao; Zhao, Jiapeng; Jin, Lanyu; Ji, Weixiao; Huang, He; Pang, Siping.
Afiliación
  • Du D; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Chen Y; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Zhang H; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Zhao J; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Jin L; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Ji W; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Huang H; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
  • Pang S; School of Materials Science & Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Angew Chem Int Ed Engl ; 63(33): e202408292, 2024 Aug 12.
Article en En | MEDLINE | ID: mdl-38818627
ABSTRACT
Redox-active azo compounds are emerging as promising cathode materials due to their multi-electron redox capacity and fast redox response. However, their practical application is often limited by low output voltage and poor thermal stability. Herein, we use a heteroatomic substitution strategy to develop 4,4'-azopyridine. This modification results in a 350 mV increase in reduction potential compared to traditional azobenzene, increasing the energy density at the material level from 187 to 291 Wh kg-1. The introduced heteroatoms not only raise the melting point of azo compounds from 68 °C to 112 °C by forming an intermolecular hydrogen-bond network but also improves electrode kinetics by reducing energy band gaps. Moreover, 4,4'-azopyridine forms metal-ligand complexes with Zn2+ ions, which further self-assemble into a robust superstructure, acting as a molecular conductor to facilitate charge transfer. Consequently, the batteries display a good rate performance (192 mAh g-1 at 20 C) and an ultra-long lifespan of 60,000 cycles. Notably, we disclose that the depleted batteries spontaneously self-charge when exposed to air, marking a significant advancement in the development of self-powered aqueous systems.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Angew Chem Int Ed Engl Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Angew Chem Int Ed Engl Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania