通过简单、低成本的化学浴沉积法在泡沫镍上原位生成了Zn-Ni氢氧化物(Zn-Ni double hydroxides)纳米片.SEM观察结果表明,Zn-Ni氢氧化物纳米片均匀附着在泡沫镍表面,形成均一的多孔纳米片阵列层.此外,还有大量的Zn-Ni氢氧化物纳米片聚集成多孔团聚体,分布于泡沫镍骨架的空隙处,从而获得较高的活性物质负载量(4.27 mg/cm2).CV、CP和电化学阻抗测试表明,Zn-Ni氢氧化物纳米片在2 mol/L KOH电解液中充放电电流密度1 A/g时,比电容为746.2 F/g(面积电容为3.18 F/cm2);3000次充放电循环后,仍保持70.9％的初始比电容.
Zn-Ni hydroxide nano-sheets were successfully deposited on nickel foams through a mild,cost-effective chemical bath method.SEM observation shows that these interconnected nano-sheets form a uniform marray layer and completely cover the surface of nickel foam.At the same time,additional homogeneously-precipitated hydroxide nano-sheets locate in the skeleton voids of nickel foams as aggregated porous clumps,resulting in a relatively high mass-loading of 4.27 mg/cm2.Afterwards,the electrochemical capacitive behaviors of this binder-free electrode were investigated by cyclic voltammetry,galvanostatic charge/discharge tests and electrochemical impedance spectroscopy.It is found that the Zn-Ni hydroxide electrode exhibits a specific capacitance of 746.2 F/g (areal capacitance of 3.18 F/cm2) at a current density of 1 A/g in 2 mol/L KOH electrolyte.Meanwhile,the Zn-Ni hydroxide electrode also shows a decent long-life cycling stability,retaining 70.9％ of the initial capacitance after 3000 charge-discharge cycles.
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