材料科学
电催化剂
电化学
量子点
石墨烯
电化学动力学
纳米技术
阴极
动力学
电极
化学工程
氧化还原
异质结
光电子学
物理化学
化学
量子力学
物理
工程类
冶金
作者
Rongjie Luo,Qifei Guo,Zihuan Tang,Miaomiao Zhang,Xingxing Li,Biao Gao,Xuming Zhang,Kaifu Huo,Yang Zheng
标识
DOI:10.1002/adfm.202306115
摘要
Abstract The serious shuttle effect and sluggish reaction kinetics intrinsically handicap the practical application of Li‐S batteries. Herein, a unique 3D hierarchically porous Mott–Schottky electrocatalyst composed of W 2 C quantum dots (QD) spatially confined in nitrogen‐doped graphene microspheres (NGM) is proposed for regulating the kinetics of sulfur electrochemistry. Experimental and theoretical results disclose a spontaneous charge rearrangement and induce built‐in electric field across the W 2 C QD/NGM heterojunction interface, contributing to reduced energy barrier for both polysulfides reduction and Li 2 S oxidation during entitle discharge/charge processes. Furthermore, the ultrasmall W 2 C QD with high electrocatalytic activity and superior conductivity can promote the conversion of S species, while the hierarchically porous microspheres assembled from wrinkled graphene nanosheets not only can efficiently inhibit the polysulfides shuttling via multiple spatial confinement, but also provide abundant inner space for stable reservation of active S, highly conductive networks, and maintain the structural integrity of cathode during consecutive cycling. Consequently, Li‐S batteries employed with the designed W 2 C QD/NGM‐based cathode exhibit outstanding electrochemical properties even at a high sulfur loading. The superior performance combined with the simplicity of the synthesis process represents a promising strategy for the rational design of advanced electrocatalyst for energy applications.
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