Interlayer and Phase Engineering Modifications of K-MoS2@C Nanoflowers for High-Performance Degradable Zn-Ion Batteries

被引：12

作者：

Li, Fengfeng ^{[1
]}

Ma, Hongyun ^{[1
]}

Sheng, Hongwei ^{[1
]}

Wang, Zhaopeng ^{[2
]}

Qi, Yifeng ^{[1
]}

Wan, Daicao ^{[2
]}

Shao, Mingjiao ^{[1
]}

Yuan, Jiao ^{[1
,3
]}

Li, Wenquan ^{[3
]}

Wang, Kairong ^{[2
]}

Xie, Erqing ^{[1
]}

Lan, Wei ^{[1
]}

机构：

[1] Lanzhou Univ, Sch Phys Sci & Technol, Lanzhou 730000, Gansu, Peoples R China

[2] Lanzhou Univ, Chinese Acad Med Sci 2019RU066, Sch Basic Med Sci, Key Lab Preclin Study New Drugs Gansu Prov,Res Uni, Lanzhou 730000, Gansu, Peoples R China

[3] Qinghai Normal Univ, Sch Phys & Elect Informat Engn, Xining 810008, Qinghai, Peoples R China

来源：

SMALL | 2024年 / 20卷 / 13期

基金：

中国国家自然科学基金;

关键词：

aqueous zinc-ion battery; degradable; interlayer engineering; MoS2; redox active; ZINC; CHALLENGES; NANOSHEETS; CAPACITY; CATHODE; MOS2;

D O I：

10.1002/smll.202306276

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

2D transition metal dichalcogenides (TMDs) have garnered significant interest as cathode materials for aqueous zinc-ion batteries (AZIBs) due to their open transport channels and abundant Zn2+ intercalation sites. However, unmodified TMDs exhibit low electrochemical activity and poor kinetics owing to the high binding energy and large hydration radius of divalent Zn2+. To overcome these limitations, an interlayer engineering strategy is proposed where K+ is preintercalated into K-MoS2 nanosheets, which then undergo in situ growth on carbon nanospheres (denoted as K-MoS2@C nanoflowers). This strategy stimulates in-plane redox-active sites, expands the interlayer spacing (from 6.16 to 9.42 & Aring;), and induces the formation of abundant MoS2 1T-phase. The K-MoS2@C cathode demonstrates excellent redox activity and fast kinetics, attributed to the potassium ions acting as a structural "stabilizer" and an electrostatic interaction "shield," accelerating charge transfer, promoting Zn2+ diffusion, and ensuring structural stability. Meanwhile, the carbon nanospheres serve as a 3D conductive network for Zn2+ and enhance the cathode's hydrophilicity. More significantly, the outstanding electrochemical performance of K-MoS2@C, along with its superior biocompatibility and degradability of its related components, can enable an implantable energy supply, providing novel opportunities for the application of transient electronics.

引用

页数：14