WP Nanocrystals on N,P Dual-Doped Carbon Nanosheets with Deeply Analyzed Catalytic Mechanisms for Lithium–Sulfur Batteries

作     者：Peng Wang Zhengchunyu Zhang Ning Song Xuguang An Jie Liu Jinkui Feng Baojuan Xi Shenglin Xiong Peng Wang;Zhengchunyu Zhang;Ning Song;Xuguang An;Jie Liu;Jinkui Feng;Baojuan Xi;Shenglin Xiong

作者机构：School of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100 School of Mechanical EngineeringChengdu UniversityChengdu 610106 The State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050 School of Materials Science and EngineeringShandong UniversityJinan 250061 

出 版 物：《CCS Chemistry》 (中国化学会会刊（英文）)

年 卷 期：2023年第5卷第2期

页      面：397-411页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China(grant nos.U21A2077 and 21871164) the Taishan Scholar Project Foundation of Shandong Province(grant no.ts20190908) the Natural Science Foundation of Shandong Province(grant nos.ZR2021ZD05 and ZR2019MB024). 

主　　题：WP nanocrystals in situ self-phosphating shuttling effect electrocatalysis mechanism lithium–sulfur batteries 

摘      要：The use of transition-metal phosphides(TMPs)as catalytic materials to accelerate kinetics of lithium polysulfide(LiPS)conversion has unique advantages.Nevertheless,simple and low-cost preparation strategies are still required for the synthesis of novel TMPs with satisfactory performance.Importantly,the in-depth understanding of the effect of intrinsic interaction between catalytic materials and LiPSs on the promoted kinetics remains limited.Herein,a novel structure of tungsten phosphide(WP)nanocrystals decorated on N,P codoped carbon sheets(WP/NPC)with uniform dispersion is designed by a structure-oriented strategy to promote LiPS redox kinetics.The electrochemical kinetics measurements coupled with density functional theory computations and in situ/ex situ characterizations demonstrate that the strong interaction through W–S bonding and the favorable interfacial charge state of WP-LiPSs promote the nucleation and dissociation of Li2S.Benefiting from this superiority,the WP/NPG-based lithium–sulfur batteries indicate significantly improved electrochemical performance with good cycling life and excellent rate capability.This work provides a methodology for the design of TMP-involved electrode materials and a fundamental understanding of the intrinsic mechanism of catalysis.