Co, Mn-LDH nanoneedle arrays grown on Ni foam for high performance supercapacitors
Co, Mn-LDH nanoneedle arrays grown on Ni foam for high performance supercapacitors
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在泡沫镍上生长的 Co, Mn-LDH 纳米针阵列用于高性能超级电容器
DOI：
10.1016/j.apsusc.2018.10.276
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发表时间：
2019-03-01
影响因子：
6.7
通讯作者：
Kong, Qinghong
中科院分区：
文献类型：
--
作者：
Su, Dongqin;Tang, Zehua;Kong, Qinghong
为解决层状双金属氢氧化物（LDH）的团聚问题，提高其超级电容器性能，采用一步水热法在泡沫镍上制备了Co，Mn-LDH纳米针阵列（Co，Mn-LDH@NF hybrid）。泡沫镍作为骨架将Co，Mn-LDH纳米针固定在纳米针上，形成三维网状结构，并在纳米针之间形成空隙。当Co，Mn-LDH@ NF杂化物用作超级电容器的无粘合剂电极时，其显示出优异的超级电容器性能，在1 A g（-1）下具有2422 F g（-1）的高比电容，并且在3000次循环后保持2096 F g（-1）的容量的上级循环稳定性，其容量损失率仅为13.5%。结果表明，LDH纳米针结构和三维网状结构提供了丰富的电化学活性中心，抑制了体积膨胀，并具有良好的导电性，是其优异的超级电容器性能的主要原因。
To solve the agglomeration of layered double hydroxides (LDH) for improving their supercapacitor performances, Co, Mn-LDH nanoneedle arrays grown on Ni foam (Co, Mn-LDH@NF hybrid) was fabricated via a one-step hydrothermal strategy. The Ni foam served as the skeleton frame for anchoring Co, Mn-LDH nanoneedles to form three dimensional net structures, and open spaces among Co, Mn-LDH nanoneedles. When Co, Mn-LDH@ NF hybrid was used as binder-free electrodes for supercapacitors, it displayed outstanding supercapacitor performances with a high specific capacitance of 2422 F g(-1) at 1 A g(-1), and superior cyclic stability for maintaining a capacitance of 2096 F g(-1) after 3000 cycles, which was only 13.5% capacity loss ratio. The excellent supercapacitor performances were ascribed to three dimensional net structure and LDH nanoneedle structure, which provided abundant electrochemical active sites, alleviated volume expansion, and had good electrical conductivity.