异质结
材料科学
钾
阳极
储能
金属
格子(音乐)
凝聚态物理
化学工程
化学物理
光电子学
电极
物理化学
热力学
物理
冶金
化学
工程类
功率(物理)
声学
作者
Hui Shan,Jian Qin,Yingchun Ding,Hirbod Maleki Kheimeh Sari,Xuexia Song,Wen Liu,Youchen Hao,Jingjing Wang,Chong Xie,Jiujun Zhang,Xifei Li
标识
DOI:10.1002/adma.202102471
摘要
Abstract Heterostructure construction is an efficient method for reinforcing K + storage of transition metal selenides. The spontaneously developed internal electric fields give a strong boost to charge transport and significantly reduce the activation energy. Nevertheless, perfection of the interfacial region based on the energy level gradient and lattice matching degree is still a great challenge. Herein, rich vacancies and ultrafine CoSe 2 –FeSe 2 heterojunctions with semicoherent phase boundary are simultaneously obtained, which possess unique electronic structures and abundant active sites. When employed as anodes for potassium‐ion batteries (PIBs), CoSe 2 –FeSe 2 @C composites display a reversible potassium storage of 401.1 mAh g −1 at 100 mA g −1 and even 275 mAh g −1 at 2 A g −1 . Theoretical calculation also reveals that the potassium‐ion diffusion can be dramatically promoted by the controllable CoSe 2 –FeSe 2 heterojunction.
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