V2O5 nanobelt arrays with controllable morphologies for enhanced performance supercapacitors
V2O5 nanobelt arrays with controllable morphologies for enhanced performance supercapacitors
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具有可控形貌的 V2O5 纳米带阵列可增强超级电容器的性能
DOI：
10.1039/c7ce01444a
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发表时间：
2017
期刊：
影响因子：
3.1
通讯作者：
Zhen Qiang
中科院分区：
文献类型：
--
作者：
Xu Jiahe;Zheng Feng;Gong Hanqin;Chen Lai;Xie Jiaheng;Hu Pengfei;Li Yang;Gong Yu;Zhen Qiang
采用一步水热法，在不添加任何添加剂的情况下，在Ni泡沫上垂直生长了有序的V2O5纳米带阵列（vnb）。得到的vnb是具有二维层状结构的单晶。讨论了不同热液时期vnb的形态演化及生长机理。通过调整钒源浓度、pH值和热液温度，可以控制材料的形貌、长宽比和尺寸。此外，这些形貌参数会显著影响比电容、循环稳定性和电荷转移电阻。由于排列有序、单晶、自上而下和层状结构，vnb作为无粘结剂电极材料具有较高的离子存储容量、比电容（498 F g−1）、5000次循环后的循环稳定性（88.8%）和较低的电荷转移电阻（14.2 Ω），在储能器件中具有很大的实际应用潜力。
Ordered V2O5 nanobelt arrays (VNBs) vertically grown on Ni foam have been realized by one-step hydrothermal method without any additives. The obtained VNBs are a single crystal with a two-dimensional (2D) layered structure. The morphology evolution and growth mechanism of VNBs are discussed at different hydrothermal times. The morphologies, length–width ratios and sizes of materials can be controlled by simply adjusting vanadium source concentrations, pH values and hydrothermal temperatures. Moreover, these morphology parameters can significantly affect specific capacitance, cycle stability and charge transfer resistance. Due to the ordered arrangement, single-crystal, top–down and layered structure, VNBs have a relatively high ion storage capacity, specific capacitance (498 F g−1), cycling stability (88.8%) after 5000 cycles and low charge transfer resistance (14.2 Ω) as binder-free electrode materials, which reveals a great potential for practical application in energy storage devices.