Ni单原子负载氮掺杂多孔碳促进锂硫电池中的多硫化物转化
Single-atomic nickel supported on nitrogen-doped porous carbon to boost polysulfide conversion in lithium-sulfur batteries
陈乐园 1孙焱焱 1常智 1柴思敏 1何琼 1潘安强2
作者信息
- 1. School of Materials Science and Engineering,Central South University,Changsha 410083,China
- 2. School of Materials Science and Engineering,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Xinjiang University,Urumqi 830046,China
- 折叠
摘要
由分散在氮掺杂碳载体上的原子级金属位点组成的单原子催化剂(M SAC@NC)因其具有最大的原子利用率、独特的物理化学性质和优异的催化活性,已成为Li-S电池中的高性能电催化材料.本文采用物理吸附和热解相结合的方法,成功制备了一系列具有相似结构和理化性质的M SAC@NC(M=Ni,Co,Fe).双球差校正高角环形暗场扫描透射电子显微镜和X射线吸收光谱表明成功形成了单原子金属位点.此外,对硫氧化还原反应的催化活性趋势为Ni SAC@NC＞Co SAC@NC＞Fe SAC@NC,其中Ni SAC@NC在0.5 C下表现出 1280.6 mAh g-1的最高容量,循环800次后,平均每圈容量衰减率仅为0.07％,具有优异的电池性能.
Abstract
Single-atomic catalysts consisting of atomically dispersed metal sites within nitrogen-doped carbon matrix(M SAC@NC)have emerged as high-performance electro-catalytic materials in Li-S batteries due to their maximum atom utilization,unique physicochemical properties,and su-perior catalytic activity.In the present work,a series of M SAC@NC(M=Ni,Co,Fe)with similar structural and physicochemical properties have been successfully prepared by the combination of physical adsorption and pyrolysis.The combination of the aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and X-ray adsorption spectra indicates the successful formation of single-atomic metal sites.Moreover,the catalytic activity trend toward sulfur redox reaction is observed to be Ni SAC@NC＞Co SAC@NC＞Fe SAC@NC,and the Ni SAC@NC delivers the highest capacity of 1,280.6 mAh g-1 and long-time stability at a decay rate of 0.07％per cycle for 800 cycles at 0.5 C,demonstrating excellent battery performance.
关键词
single-atomic catalyst/electrocatalysis/Li-S batteryKey words
single-atomic catalyst/electrocatalysis/Li-S battery引用本文复制引用
基金项目
Key Research and Development Program of Hunan Province,China(2023GK2015)
Science and Technology Innovation Leader Program of Hunan Province(2022RC3049)
Fundamental Research Funds for the Central Universities(202044011)
Natural Science Foundation of Changsha(KQ2208259)
出版年
2024
NETL
NSTL
万方数据