Enhanced supercapacitor performance by fabricating hierarchical nanoporous nickel/nickel hydroxide structure

Enhanced supercapacitor performance by fabricating hierarchical nanoporous nickel/nickel hydroxide structure
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通过制造分层纳米多孔镍/氢氧化镍结构增强超级电容器性能

DOI:
10.1016/j.matlet.2015.06.035
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发表时间:
2015-11
期刊:
影响因子:
3
通讯作者:
Wang Y.
Wang Y.
中科院分区:
材料科学3区
文献类型:
--
作者:
Qiu H. -J.;Peng L.;Li X.;Wang Y.

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通过在1.0 M NaOH水溶液中对稀释的Ni 15 Al 85前驱体进行化学去合金化,制备了同时具有纳米孔(小于10 nm)和大孔/通道(数百nm)的分级纳米多孔Ni。由于纳米Ni的活性,通过电化学氧化可以将Ni纳米韧带转化为Ni/Ni(OH)2核壳型纳米复合材料。与均匀的纳米多孔Ni相比,分级纳米多孔Ni提供了更多的空隙空间,并允许在内部形成更活性的Ni氢氧化物。因此,分级纳米多孔金属/金属氢氧化物复合材料表现出高的面电容(~4.76 F cm-2),具有良好的倍率性能和循环稳定性。
Hierarchical nanoporous Ni with both nanopores (less than 10 nm) and big pores/channels (hundreds nm) was fabricated by chemically dealloying a diluted Ni15Al85precursor in 1.0 M NaOH aqueous solutions. Due to the active property of nanoscale Ni, the Ni nano-ligaments can be easily converted to Ni/Ni(OH)2core–shell-like nano-composite by electrochemical oxidation. Compared with uniform nanoporous Ni, the hierarchical nanoporous Ni provides more void space and allows the formation of more active Ni hydroxides inside. Consequently, the hierarchical nanoporous metal/metal hydroxides composite exhibits a high areal capacitance (~4.76 F cm−2) with good rate performance and cycling stability.
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