Earth-abundant nanotubes with layered assembly for battery-type supercapacitors
Earth-abundant nanotubes with layered assembly for battery-type supercapacitors
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DOI：
10.1016/j.cej.2018.06.030
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发表时间：
2018-10
影响因子：
15.1
通讯作者：
Jie Zhou;Simeng Dai;Yanan Li;Fenfen Han;Yan Yuan;Jian Tang;Weihua Tang
中科院分区：
文献类型：
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作者：
Jie Zhou;Simeng Dai;Yanan Li;Fenfen Han;Yan Yuan;Jian Tang;Weihua Tang
逐层组装已被探索作为一种通用的自下而上的纳米制造技术，用于所需的纳米结构复合材料。我们在此报告了地球上丰富的粘土上的一类新型层组装作为超级电容器的潜在电极材料。通过生长和聚合方法，将 NiMn 层状双氢氧化物 (NiMn-LDHs) 或/和聚 (3,4-乙撑二氧噻吩) (PEDOT) 沉积到穿孔埃洛石纳米管 (H-HNTs) 模板上，构建分层结构。由此产生的复合材料呈现出三维结构，具有显着增加的表面积和明确的芯鞘结构。 NiMn-LDHs/H-HNTs电极的最大比电容为1665Fg−1（在1Ag−1时），具有优异的倍率性能（在15Ag−1时保持74.8％）和循环稳定性（2000次循环后电容保持率为89.7％），其性能与文献报道的人工模板上的NiMn-LDHs复合材料相当。 NiMn-LDHs/PEDOT/H-HNTs 电极表现出更高的比电容 (1808Fg−1at 1Ag−1) 和循环稳定性。此外，NiMn-LDHs/PEDOT/H-HNTs的对称器件表现出167.8Fg−1（at 1Ag−1）的高比电容、59.6Whkg−1的最大能量密度和15.7kWkg−1的最大功率密度。 H-HNT 的成本比商业碳纳米管低得多，因此成为具有成本效益的电容储能的有前途的模板。
Layer-by-layer assembly has been explored as a versatile bottom-up nanofabrication technique for desired nanostructured composites. We herein report a new class of layer-assembles on earth-abundant clays as potential electrode materials for supercapacitors. The hierarchical structure was constructed by deposition of NiMn layered double hydroxides (NiMn-LDHs) or/and poly(3,4-ethylenedioxythiophene) (PEDOT) onto perforated halloysite nanotubes (H-HNTs) template via growth and polymerization methods. The resulting composites exhibit a three-dimensional architecture with dramatically increased surface area and well-defined core-sheath configuration. NiMn-LDHs/H-HNTs electrode delivers a maximum specific capacitance of 1665 F g−1(at 1 A g−1), excellent rate capability (74.8% retention at 15 A g−1) and cycling stability (89.7% capacitance retention over 2000 cycles), with the performance comparable to those of literature reported NiMn-LDHs composites on artificial templates. NiMn-LDHs/PEDOT/H-HNTs electrode exhibits even higher specific capacitance (1808 F g−1at 1 A g−1) and cycling stability. Moreover, symmetric device of NiMn-LDHs/PEDOT/H-HNTs exhibit a high specific capacitance of 167.8 F g−1(at 1 A g−1), a maximum energy density of 59.6 W h kg−1and maximum power density of 15.7 kW kg−1. With a much lower cost than commercial carbon nanotubes, H-HNTs stand out as a promising template for cost-effective capacitive energy storage.