Nickel Regulating Endows Fe7Se8 With Stable Potassium-Ion Storage

Qingyi Zhao, Fangrui Yu, Yizhi Yuan, Song Chen, Wei Chen, Hongli Deng, Xiangdong Guo, Hongtao Sun, Hao Chen, Jian Zhu
{"title":"Nickel Regulating Endows Fe7Se8 With Stable Potassium-Ion Storage","authors":"Qingyi Zhao,&nbsp;Fangrui Yu,&nbsp;Yizhi Yuan,&nbsp;Song Chen,&nbsp;Wei Chen,&nbsp;Hongli Deng,&nbsp;Xiangdong Guo,&nbsp;Hongtao Sun,&nbsp;Hao Chen,&nbsp;Jian Zhu","doi":"10.1002/cnl2.70007","DOIUrl":null,"url":null,"abstract":"<p>Iron-based selenides are considered as potential electrode materials in potassium-ion batteries (PIBs) owing to the merits of high capacity, intrinsic safety, and cost-effectiveness. However, sluggish electronic/ionic transport kinetics and large volume variations result in suboptimal electrochemical performance. Herein, we report a nickel-doped Fe<sub>7</sub>Se<sub>8</sub> with double-shell N-doped carbon (Ni-Fe<sub>7</sub>Se<sub>8</sub>@DNC) as anode for robust potassium ion storage. Notably, the introduction of Ni induces the lattice distortion and leads to a rearrangement of charge, thereby creating numerous active sites and optimizing the band structure to enhance charge transport. Additionally, the elastic carbon shell can synergistically mitigate the volume expansion upon cycling and maintain the structural stability. Thus, the Ni-Fe<sub>7</sub>Se<sub>8</sub>@DNC presented excellent cycling stability of more than 1 year (464.8 mAh g<sup>−1</sup>after 1000 cycles at 0.1 A g<sup>−1</sup>, the best stability among all iron-based selenides) and satisfactory rate capability. The potassium-ion hybrid capacitors (PIHCs) have also demonstrated a remarkable energy density of 186.5 Wh kg<sup>−1</sup> at 0.2 A g<sup>−1</sup>. Density functional theory calculations, in conjunction with a range of characterization methods, validate the rapid pseudocapacitive effect and lower ion diffusion energy barriers, resulting from Ni doping, improve reaction kinetics. This study paves the avenue for novel anode material designs for PIBs.</p>","PeriodicalId":100214,"journal":{"name":"Carbon Neutralization","volume":"4 2","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cnl2.70007","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carbon Neutralization","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/cnl2.70007","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

Iron-based selenides are considered as potential electrode materials in potassium-ion batteries (PIBs) owing to the merits of high capacity, intrinsic safety, and cost-effectiveness. However, sluggish electronic/ionic transport kinetics and large volume variations result in suboptimal electrochemical performance. Herein, we report a nickel-doped Fe7Se8 with double-shell N-doped carbon (Ni-Fe7Se8@DNC) as anode for robust potassium ion storage. Notably, the introduction of Ni induces the lattice distortion and leads to a rearrangement of charge, thereby creating numerous active sites and optimizing the band structure to enhance charge transport. Additionally, the elastic carbon shell can synergistically mitigate the volume expansion upon cycling and maintain the structural stability. Thus, the Ni-Fe7Se8@DNC presented excellent cycling stability of more than 1 year (464.8 mAh g−1after 1000 cycles at 0.1 A g−1, the best stability among all iron-based selenides) and satisfactory rate capability. The potassium-ion hybrid capacitors (PIHCs) have also demonstrated a remarkable energy density of 186.5 Wh kg−1 at 0.2 A g−1. Density functional theory calculations, in conjunction with a range of characterization methods, validate the rapid pseudocapacitive effect and lower ion diffusion energy barriers, resulting from Ni doping, improve reaction kinetics. This study paves the avenue for novel anode material designs for PIBs.

Abstract Image

求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信