Introducing Metal-Organic Nanotubes to Derive High-Density Bimetal Alloy Nanoparticles Supported on Nanorods for Lithium-Oxygen Batteries

作者：Luo, Hao; Lin, Cong; Zhou, Hongbin; Zhao, Yajun; Wang, Xiaomin; Zhang, Dawei^*; Yu, Yan^*

来源：Advanced Materials Interfaces, 2022, 9(13): 2102110.

DOI：10.1002/admi.202102110

• alloys
• high-density NiCo alloy nanoparticles
• lithium-oxygen batteries
• metal-organic nanotubes
• oxygen electrocatalysis

Oxygen electrolysis is the key component of lithium-oxygen batteries, which require highly active cathode catalysts to reduce cathode polarization and improve cycling stability, while metal-organic frameworks (MOFs) and MOF-derived carbon-based materials have aroused great interest as alternatives to noble-metal oxygen electrocatalysts. Herein, a single-walled metal-organic nanotube (MONT), Ni(II)(C6H7NO6)(H2O), with a novel crystal structure, is synthesized and doped with cobalt to be used as precursors to produce the uniformly distributed high-density NiCo alloy nanoparticles, which are encapsulated by the graphitized N-doped carbon (NiCo@NC) and supported on the nanorods based on the structural and morphological characteristics of the MONT precursor. Benefited from the uniformly distributed high-density catalytic active sites, bimetal alloy composition, and excellent mass transfer structure, the as-derived NiCo@NC catalyst endows the assembled lithium-oxygen battery with a low overpotential of 0.98 V, a high discharge capacity of 12 477 mAh g(-1), and more importantly, the excellent cycling stability of over 800 h. These findings demonstrate the potential of this superb catalyst in high-performance lithium-oxygen batteries and diverse energy conversion and storage devices.

• 单位
  中国科学院; y