目的 寻找一种简便、价廉、对环境友好的方法制备具有高比容、长寿命的 Ni(OH)2 自集流超级电容器电极材料。 方法 采用水热法(15% (质量分数)的 H2O2溶液,180 ℃ ,24 h)直接在泡沫镍集流体上原位生长 Ni(OH)2,并对其形貌、组成以及电化学性能进行研究。 结果 通过双氧水水热处理,可以在泡沫镍集流体上原位生长出边长 400 ~ 600 nm、厚度约 200 nm 的 Ni(OH)2 六边形片,此为六方晶的β-Ni(OH)2。 该电极材料在 2 mol/ L KOH 溶液中的最高比容为 2534 F/ g(扫速 1 mV/ s),且循环 1000 圈后,比容值仍保持在 91% 以上(扫速为 50 mV/ s)。 结论 该制备方法简单价廉,对环境友好,制得的电极材料具有自支撑、自集流的特点,且具有优异的电化学性能和良好的循环稳定性。

Objective To in-situ fabricate self-collected Ni(OH)2 supercapacitor electrode materials with excellent capacitance and good cycle stability by a facile, cost-effective and green method. Methods The hydrothermal treatment of Ni foam was performed in a 15wt. % H2O2 solution at 180 ℃ for 24 h to in-situ fabricate Ni(OH)2. The morphologies, phase composition and electrochemical performance of the as-prepared Ni(OH)2 electrode material were characterized. Results The β-Ni(OH)2 hexagonal platelets with the side lengths of 400 ~600 nm and the thickness of ~200 nm were obliquely laid on the Ni foam at high densities. The electrode demonstrated excellent capacitance (2534 F/ g at a scan rate of 1 mV/ s) and good cycling stability (91% capacitance retention after 1000 cycles at a scan rate of 50 mV / s) in 2 mol / L KOH aqueous solution. Conclusion The fabrication method developed here was facile, cost-effective and green. The as-prepared binder-free, self-collected electrode material exhibited remarkable electrochemical performance with high specific capacity and good cycling stability.