Superhydrophilic nickel hydroxide ultrathin nanosheets enable high-performance asymmetric supercapacitors

Yi-Ran Wang ¹Fei Zhang ¹Jian-Min Gu ¹Xiao-Yu Zhao ²Ran Zhao ¹Xing Wang ¹Tian-Hui Wu ³Jing Wang ¹Ji-Dong Wang ¹De-Song Wang⁴

扫码查看

作者信息

1. State Key Laboratory of Metastable Materials Science and Technology(MMST),Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao 066004,China
2. Department of Food and Pharmaceutical Engineering,Suihua University,Suihua 152000,China
3. School of Chemical Science and Engineering,Tongji University,Shanghai 200092,China
4. State Key Laboratory of Metastable Materials Science and Technology(MMST),Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao 066004,China;School of Sciences,Hebei University of Science and Technology,Shijiazhuang 050018,China
折叠

Abstract

Superhydrophilic surfaces have been applied for supercapacitor;however,during energy storage reaction,how the wettability affects the process of electrochemical reaction specifically is still unclear.Herein,we demon-strate superhydrophilic surface for promotion of electro-chemical reactions by liquid affinity and further explain the mechanism,where the transition of the wettability state caused by the change in surface free energy is the main reason for the obvious increase in specific capacitance.Through citric acid assistance strategy,an intrinsically hydrophobic Ni(OH)2 thick nanosheets(HNHTNs,16 nm)can be transitioned into superhydrophilic Ni(OH)2 ultrathin nanosheets(SNHUNs,6.8 nm),where the water contact angle was 0°and the surface free energy increased from 8.6 to 65.8 mN·m-1,implying superhydrophilicity.Compared with HNHTNs,the specific capacitance of SNHUNs is doubled:from 1230 F·g-1(HNHTNs)to 2350 F·g-1(2 A·g-1)and,even at 20 A·g-1,from 833 F·g-1(HNHTNs)to 1670 F·g-1.The asymmetric capacitors assembled by SNHUNs and activated carbon show 52.44 Wh·kg-1 at 160 W·kg-1 and excellent stability with～90％retention after 5000 cycles(～80％retention after 9500 cycles).The promotion of electrochemical performances is ascribed to the change of surface wettability caused by surface free energy,which greatly increase affinity of electrode to the surrounding liquid environment to reduce the interface resistance and optimize the electron transport path.

Key words

Asymmetric supercapacitor/Superhydrophilic interface/Transition metal hydroxides/Ultrathin nanosheets/High specific capacitance

引用本文复制引用

基金项目

National Natural Science Foundation of China(22278349)

National Natural Science Foundation of China(62071413)

Hebei Natural Science Foundation(B2020203013)

Hebei Natural Science Foundation(F2020203056)

Science and Technology Project of Hebei Education Department(QN2020137)

Subsidy for Hebei Key Laboratory of Applied Chemistry after Operation Performance(22567616H)

Cultivation Project for Basic Research Innovation of Yanshan University(2021LGZD015)

Natural Science Foundation of Heilongjiang Province of China(LH2022B025)

Fundamental Research Funds for the Provincial Universities of Heilongjiang Province(KYYWF10236190104)

出版年

2024

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDCSCDEI

影响因子：0.801

ISSN：1001-0521

参考文献量52

段落导航