Efficient Catalytic Conversion of Polysulfides by Biomimetic Design of “Branch‑Leaf” Electrode for High‑Energy Sodium–Sulfur Batteries  

作　　者：Wenyan Du Kangqi Shen Yuruo Qi Wei Gao Mengli Tao Guangyuan Du Shu‑juan Bao Mingyang Chen Yuming Chen Maowen Xu 

机构地区：[1]Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University),Ministry of Education,School of Materials and Energy,Southwest University,Chongqing 400715,People’s Republic of China [2]Beijing Computational Science Research Center,Beijing 100193,People’s Republic of China [3]Center for Green Innovation,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,People’s Republic of China [4]College of Environmental Science and Engineering,Fujian Normal University,Fuzhou 350007,People’s Republic of China

出　　处：《Nano-Micro Letters》2021年第3期155-167,共13页纳微快报（英文版）

基　　金：This work is financially supported by Grants from the National Natural Science Foundation of China(No.21773188,21972111,U1530401);Natural Science Foundation of Chongqing(cstc2018jcyjAX0714).

摘　　要：Rechargeable room temperature sodium–sulfur(RT Na–S)batteries are seriously limited by low sulfur utilization and sluggish electrochemical reaction activity of polysulfide intermediates.Herein,a 3D“branch-leaf”biomimetic design proposed for high performance Na–S batteries,where the leaves constructed from Co nanoparticles on carbon nanofibers(CNF)are fully to expose the active sites of Co.The CNF network acts as conductive“branches”to ensure adequate electron and electrolyte supply for the Co leaves.As an effective electrocatalytic battery system,the 3D“branch-leaf”conductive network with abundant active sites and voids can effectively trap polysulfides and provide plentiful electron/ions pathways for electrochemical reaction.DFT calculation reveals that the Co nanoparticles can induce the formation of a unique Co–S–Na molecular layer on the Co surface,which can enable a fast reduction reaction of the polysulfides.Therefore,the prepared“branch-leaf”CNF-L@Co/S electrode exhibits a high initial specific capacity of 1201 mAh g^−1 at 0.1 C and superior rate performance.

关 键 词：Co nanoparticles Sodium-sulfur batteries Branch-leaf biomimetic 

分 类 号：TM912[电气工程—电力电子与电力传动]