Mesoporous ITO/NiO with a core/shell structure for supercapacitors
Mesoporous ITO/NiO with a core/shell structure for supercapacitors
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DOI：
10.1016/j.nanoen.2013.06.011
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发表时间：
2013-11
期刊：
影响因子：
17.6
通讯作者：
D. T. Dam;Xin Wang;Jong‐Min Lee
中科院分区：
文献类型：
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作者：
D. T. Dam;Xin Wang;Jong‐Min Lee
本研究采用化学气相沉积（CVD）法在钛基片上沉积六方溶致氢氧化镍（HI-e），并通过溶致液晶（LLC）模板电沉积，然后在空气中于270 °C煅烧，成功合成了一种新型的具有壳/核结构的介孔NiO/ITO纳米纤维。采用X射线衍射（XRD）、拉曼光谱、场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）对电极材料进行了表征。循环伏安法和计时电位法均表明NiO/ITO纳米线复合电极的电化学性能和超电容性能均比块体介孔氧化镍薄膜有所提高。在0 V至0.5 V的电位范围内，在1 A g-1的放电电流密度下，通过在1 M KOH溶液中的恒电流充放电测量确定1025 F g-1的最大比电容。新合成的异质结构还具有高的电容保持率在高放电电流密度和长期的电化学稳定性在碱性溶液中。因此，这项研究提供了一个有前途的电极工程技术的各种应用。
In this study, a novel mesoporous NiO/ITO NW with a shell/core structure has been successfully synthesized by combining chemical vapor deposition (CVD) on titanium substrate and electrodeposition of HI–e (hexagonal lyotropic) nickel hydroxide through a lyotropic liquid crystalline (LLC) template, followed by calcination in air at 270 °C. The electrode material is characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Both cyclic voltammetry (CV) and chronopotentiometry demonstrate enhanced electrochemical properties of NiO/ITO NWs composite electrode and improved supercapacitive behaviors as compared to bulk mesoporous nickel oxide film. Maximum specific capacitance of 1025 F g−1at a discharge current density of 1 A g−1in the potential ranges from 0 V to 0.5 V is determined by galvanostatic charge–discharge measurement in 1 M KOH solution. The newly synthesized heterostructure also possesses high capacitance retention ratio at high discharge current densities and long-term electrochemical stability in an alkaline solution. Therefore, this study provides a promising electrode engineering technique for various applications.