Shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays derived from MnCo-LDH@ZIF-67 for high-performance supercapacitors and efficient oxygen evolution reaction
Shish-kebab type MnCo2O4@Co3O4 nanoneedle arrays derived from MnCo-LDH@ZIF-67 for high-performance supercapacitors and efficient oxygen evolution reaction
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DOI：
10.1016/j.cej.2018.08.102
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发表时间：
2018-12
影响因子：
15.1
通讯作者：
Jiao-Jiao Zhou-Jiao;Xue Han;K. Tao;Qin Li;Yanli Li; Chen-Chen-Chen;L. Han
中科院分区：
文献类型：
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作者：
Jiao-Jiao Zhou-Jiao;Xue Han;K. Tao;Qin Li;Yanli Li; Chen-Chen-Chen;L. Han
一维微/纳米结构阵列由于具有良好的协同效应，在能量存储和转换器件中具有潜在的应用前景，引起了人们的极大兴趣。本工作首先合成了均匀的ZIF-67菱形十二面体贯穿的CoMn-LDH纳米针阵列，然后在空气中通过热退火将其转化为串晶型MnCo2O4@Co3O4纳米针阵列。所得的纳米针阵列表现出高的比电容（1.0 mA cm-2时为1440 C cm-2）和优异的循环稳定性，同时被评估为电池型超级电容器的有前途的电极。使用MnCo2O4@Co3O4作为正电极和活性炭（AC）作为负电极的组装的非对称超级电容器（ASC）装置在208.5W kg-1的功率密度下也表现出31 Wh kg-1的高能量密度，此外，即使在3326.6W kg-1的更高功率密度下仍保持14.6Wh kg-1。重要的是，一个红色发光二极管（LED）可以照亮约6分钟，这表明ASC的实际应用的巨大潜力。此外，MnCo2O4@Co3O4对析氧反应（OER）具有更好的电催化活性。因此，这项工作证明了一个可行的策略，设计和制造的一维串型纳米针阵列的多功能。
One-dimensional micro-/nanostructure arrays with excellent synergistic effect have attracted considerable interest for their potential applications in energy storge and conversion devices. In this work, the uniform ZIF-67 rhombic dodecahedron penetrated CoMn-LDH nanoneedle arrays were firstly synthesized and then transformed into shish-kebab type MnCo2O4@Co3O4nanoneedle arrays by thermal annealing in air. The resulting nanoneedle arrays exhibit high specific capacitance (1440C cm−2at 1.0 mA cm−2) and excellent cycling stability while evaluated as promising electrodes for battery-type supercapacitor. An assembled asymmetric supercapacitor (ASC) device using MnCo2O4@Co3O4as positive electrode and activated carbon (AC) as negative electrode also exhibits a high energy density of 31 Wh kg−1at a power density of 208.5 W kg−1, furthermore, still remains 14.6 Wh kg−1even at a higher power density of 3326.6 W kg−1. Importantly, a red light-emitting diode (LED) can be illuminated about 6 min, indicating a great potential for practical applications of the ASC. Besides, the MnCo2O4@Co3O4exhibits much better electrocatalytic activity for the oxygen evolution reaction (OER). As a result, this work demonstrates a feasible strategy for the design and fabrication of 1D shish-kebab type nanoneedle arrays with multiple functions.