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H2 O2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。
ABSTRACT: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 per-formed 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 hexago-nal platelets with the side lengths of 400~600 nm and the thickness of ~200 nm were obliquely laid on the Ni foam at high densi-ties. The electrode demonstrated excellent capacitance (2534 F/g at a scan rate of 1 mV/s) and good cycling stability (91% ca-pacitance 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.
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