One step synthesis of Ni/Ni(OH)2 nano sheets (NSs) and their application in asymmetric supercapacitors

被引:161
作者
Ede, Sivasankara Rao [1 ,2 ]
Anantharaj, S. [1 ,2 ]
Kumaran, K. T. [2 ]
Mishra, Soumyaranjan [2 ]
Kundu, Subrata [1 ,2 ,3 ]
机构
[1] Acad Sci & Innovat Res AcSIR, CSIR Cent Electrochem Res Inst CSIR CECRI Campus, New Delhi, India
[2] CSIR Cent Electrochem Res Inst CECRI, Electrochem Mat Sci ECMS Div, Karaikkudi 630006, Tamil Nadu, India
[3] Texas A&M Univ, Dept Mat Sci & Mech Engn, College Stn, TX 77843 USA
来源
RSC ADVANCES | 2017年 / 7卷 / 10期
关键词
NICKEL FOAM; ELECTROCHEMICAL PERFORMANCE; NANOPOROUS CARBON; POTENTIAL-WINDOW; HIGH-ENERGY; V; METAL; OXIDE; NANOPARTICLES; ELECTRODES;
D O I
10.1039/c6ra26584g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Ni(OH)(2) is a useful electrode material for electrochemical capacitors, due to its high theoretical specific capacitance and low cost, but its application has been limited by poor electrical conductivity. Hence, we fabricated Ni(OH)(2) nano sheets (NSs) with nickel metal NPs via the hydrothermal partial reduction of Ni(II) salt by ethanol in basic medium. The significance of the basic medium (presence of KOH) and other reaction parameters and the mechanism for the formation of Ni/Ni(OH)(2) NSs are elaborated. The Ni/Ni(OH)(2) NSs have been used as a positive electrode in an asymmetric supercapacitor (ASC) with a larger voltage window using the activated carbon (AC) as a negative electrode, which resulted in high energy and power densities. By optimizing the mass ratio between AC and Ni/Ni(OH)(2) NSs in the fabrication of electrodes, we found a maximum specific capacitance (CS) of 62 F g(-1) at 2 mA cm(-2) at a voltage of 1.65 V and observed the maximum energy and power densities of 23.45 W h kg(-1) and 4598 W kg(-1), respectively. The galvanostatic charge-discharge study shows high capacity retention up to 90%, even after 6000 consecutive cycles, which is a noteworthy achievement, considering the ASCs. Moreover, we believe that the presence of nickel metal in Ni/Ni(OH)(2) NSs helped to reduce the charge transfer resistance (RCT), which resulted in better performance. These results certainly demonstrate that such Ni/ Ni(OH)(2) NSs with Ni metal NPs are promising materials for the construction of next generation aqueous ASCs with higher specific capacitance. The synthesis procedure can be applied to other transition metals to synthesize their metal/metal hydroxide composites and enhance their conductive nature, instead of using conductive substrates.
引用
收藏
页码:5898 / 5911
页数:14
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