Formation of hierarchically 3D cactus-like architecture as efficient Mott-Schottky electrocatalyst for long-life Li-S batteries  

作　　者：Biao Wang Yilun Ren Shaowei Chen Qingxi Zhai Yuxuan Shi Yujie Ma Shaochun Tang Xiangkang Meng 

机构地区：[1]National Laboratory of Solid State Microstructures,Collaborative Innovation Center of Advanced Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China [2]Haian Institute of High-Tech Research,Nanjing University,Nanjing 226600,China

出　　处：《Nano Research》2023年第7期9318-9326,共9页纳米研究（英文版）

基　　金：This work was jointly supported by the National key research and development program(No.2022YFA1602700);Jiangsu Carbon Peak Carbon Neutralization Science and Technology Innovation Special Fund(No.BE2022605);the Key Research and Development Program of Jiangsu Provincial Department of Science and Technology of China(Nos.BE2020684 and BE2022332);the Fundamental Research Funds for the Central Universities。

摘　　要：Searching for new promising electrocatalysts with favorable architectures allowing abundant active sites and remarkable structure stability is an urgent task for the practical application of lithium-sulfur(Li-S)batteries.Herein,inspired by the structure of natural cactus,a new efficient and robust electrocatalyst with three-dimensional(3D)hierarchical cactus-like architecture constructed by functional zero-dimensional(0D),one-dimensional(1D),and two-dimensional(2D)components is developed.The cactus-inspired catalyst(denoted as Co@NCNT/NCNS)consists of N-doped carbon nanosheets(NCNS)and standing Ndoped carbon nanotubes(NCNT)forest with embedded Co nanoparticles on the top of NCNT,which was achieved by an in situ catalytic growth technique.The unique structure design integrates the advantages of 0D Co accelerating catalytic redox reactions,1D NCNT providing a fast electron pathway,and 2D NCNS assuring strong structure stability.Especially,the rich Mott-Schottky heterointerfaces between metallic Co and semiconductive NCNT can further facilitate the electron transfer,thus improving the electrocatalyst activity.Consequently,a Li-S battery with the Co@NCNT/NCNS modified separator achieves ultralong cycle life over 4000 cycles at 2 C with ultralow capacity decay of 0.016%per cycle,much superior over that of recently reported batteries.This work provides a new strategy for developing ultra-stable catalysts towards long-life Li-S batteries.

关 键 词：lithium-sulfur batteries multifunctional separator shuttle effect enhanced catalytic activity Mott-Schottky electrocatalyst 

分 类 号：O64[理学—物理化学]