• 文献标题:   Experimental and Theoretical Indagation of Binder-Free N-Graphene Coupling Vanadium Tetrasulfide Aerogel Cathode for Promoting Aqueous Zn-Ion Storage
  • 文献类型:   Article
  • 作  者:   ZHOU XT, MA HL, CHEN RY, YAN JF, WANG G
  • 作者关键词:   vanadium tetrasulfide, ngraphene, aerogel, aqueous znion batterie, density functional theory
  • 出版物名称:   ACS APPLIED ENERGY MATERIALS
  • ISSN:   2574-0962
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1021/acsaem.2c04090 EA MAR 2023
  • 出版年:   2023

▎ 摘  要

Aqueous Zn-ion batteries (AZIBs) have acquired great attention owing to their nontoxicity, high safety, and sustainable Zn resources. Nevertheless, the deficiency of applicable electrode materials hampers the advancement of the electrochemical performance for AZIBs. Herein, a N-graphene coupling vanadium tetrasulfide aerogel (VS4@NGA) forming a sponge-like heterostructured architecture is constructed through a hydro thermal and a following freeze-dehydration approach. The unique composite is evaluated as a binder-free electrode for AZIBs and presents competitive zinc storage performance (two times improvement in specific capacity over pristine VS4). The calculations based on density functional theory and electrochemical experimental studies demonstrate that the interconnected porous architecture, meliorated electrical conductivity, decreased adsorption energy, and Zn2+ diffusion energy barrier driven by the combination of VS4 with NGA synergistically realize the enhanced energy storage dynamics and exceptional electrochemical properties of the composite. The reversible Zn ion insertion/extraction reaction mechanism of the composite is clarified by a sequence of ex-situ elemental and structural characterizations. Moreover, the soft-packaged batteries assembled using the composite aerogel suggest the practical application ability of the material in electronic devices. This research offers a simple avenue for constructing a binder-free aerogel-based cathode, which provides a progressive paradigm for the advancement of AZIBs.