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A facile one-step hydrothermal approach to synthesize hierarchical core–shell NiFe2O4@NiFe2O4 nanosheet arrays on Ni foam with large specific capacitance for supercapacitors

机译:一种简便的一步式水热方法,可在具有较大比电容的超级泡沫镍泡沫上合成分层的核-壳型NiFe2O4 @ NiFe2O4纳米片阵列

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In this contribution, NiFe _(2) O _(4) @NiFe _(2) O _(4) nanosheet arrays (NSAs) with three-dimensional (3D) hierarchical core–shell structures were synthesized by a facile one-step hydrothermal method and they were used as electrode materials for supercapacitors (SCs). The NiFe _(2) O _(4) @NiFe _(2) O _(4) composite electrode showed a high specific capacitance of 1452.6 F g ~(?1) (5 mA cm ~(?2) ). It also exhibited a superior cycling stability (93% retention after 3000 cycles). Moreover, an asymmetric supercapacitor (ASC) was constructed utilizing NiFe _(2) O _(4) @NiFe _(2) O _(4) NSAs and activated carbon (AC) as the positive and negative electrode, respectively. The optimized ASC shows extraordinary performances with a high energy density of 33.6 W h kg ~(?1) at a power density of 367.3 W kg ~(?1) and an excellent cycling stability of 95.3% capacitance retention over 3000 cycles. Therefore, NiFe _(2) O _(4) @NiFe _(2) O _(4) NSAs have excellent pseudocapacitance properties and are good electrode materials for high energy density.
机译:在这一贡献中,通过一步法合成了具有三维(3D)分层核-壳结构的NiFe _(2)O _(4)@NiFe _(2)O _(4)纳米片阵列(NSA)。水热法,它们被用作超级电容器(SC)的电极材料。 NiFe _(2)O _(4)@NiFe _(2)O _(4)复合电极显示出高比电容1452.6 F g〜(?1)(5 mA cm〜(?2))。它还显示出优异的循环稳定性(3000次循环后保留率达93%)。此外,分别利用NiFe _(2)O _(4)@NiFe _(2)O _(4)NSA和活性炭(AC)作为正极和负极构造了不对称超级电容器(ASC)。经过优化的ASC表现出非凡的性能,在367.3 W kg〜(?1)的功率密度下具有33.6 W h kg〜(?1)的高能量密度,并且在3000次循环中具有出色的95.3%电容保持率的循环稳定性。因此,NiFe _(2)O _(4)@NiFe _(2)O _(4)NSA具有出色的伪电容特性,并且是用于高能量密度的良好电极材料。

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