Superhydrophilic nickel hydroxide ultrathin nanosheets enable high-performance asymmetric supercapacitors

被引:8
|
作者
Wang, Yi-Ran [1 ]
Zhang, Fei [1 ]
Gu, Jian-Min [1 ]
Zhao, Xiao-Yu [2 ]
Zhao, Ran [1 ]
Wang, Xing [1 ]
Wu, Tian-Hui [3 ]
Wang, Jing [1 ]
Wang, Ji-Dong [1 ]
Wang, De-Song [1 ,4 ]
机构
[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol MMST, Hebei Key Lab Appl Chem, Qinhuangdao 066004, Peoples R China
[2] Suihua Univ, Dept Food & Pharmaceut Engn, Suihua 152000, Peoples R China
[3] Tongji Univ, Sch Chem Sci & Engn, Shanghai 200092, Peoples R China
[4] Hebei Univ Sci & Technol, Sch Sci, Shijiazhuang 050018, Peoples R China
基金
中国国家自然科学基金; 黑龙江省自然科学基金;
关键词
Asymmetric supercapacitor; Superhydrophilic interface; Transition metal hydroxides; Ultrathin nanosheets; High specific capacitance; ONE-STEP; ELECTRODE; SURFACE; OXIDE; FOAM;
D O I
10.1007/s12598-023-02386-x
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 demonstrate superhydrophilic surface for promotion of electrochemical 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 degrees 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 similar to 90% retention after 5000 cycles (similar to 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.
引用
收藏
页码:138 / 147
页数:10
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