Nanoflake-Modulated La2 Se3 Thin Films Prepared for an Asymmetric Supercapacitor Device.
Nanoflake-Modulated La2 Se3 Thin Films Prepared for an Asymmetric Supercapacitor Device.
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DOI：
10.1002/cplu.201500009
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发表时间：
2015-09
期刊：
影响因子：
3.4
通讯作者：
S. Patil;R. Bulakhe;C. Lokhande
中科院分区：
文献类型：
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作者：
S. Patil;R. Bulakhe;C. Lokhande
通过化学浴沉积方法从水介质中制备La 2 Se 3纳米片，并随后用作超级电容器电极。采用X射线衍射（XRD）、傅里叶变换拉曼（FT拉曼）、场发射扫描电子显微镜（FESEM）和接触角测量技术研究了La 2 Se 3薄膜的结构、形貌和润湿性能。XRD研究证实了La 2Se 3薄膜的立方晶体结构。表面形貌和润湿性研究揭示了具有亲水表面的纳米片形貌，这可能有利于电化学反应。通过循环伏安法（CV）、恒电流充放电（GCD）和电化学阻抗谱（EIS）技术对La 2Se 3纳米片的电化学性能进行了评价。的La 2Se 3纳米片电极表现出331 F g-1的最大比电容在5 mV s-1的扫描速率。电化学阻抗研究证实了La 2Se 3纳米片电极在水溶液中具有较好的超级电容行为。基于La 2 Se 3电极的非对称超级电容器在水溶液电解质中表现出良好的比电容、优异的充放电性能和优越的上级长期循环稳定性。
La2 Se3 nanoflakes were prepared from an aqueous medium by means of a chemical-bath deposition method and were later utilized as a supercapacitor electrode. X-ray diffraction (XRD), Fourier transform Raman (FT Raman), field-emission scanning electron microscopy (FESEM), and contact-angle measurement techniques were used to study the structural, morphological, and wettability properties of La2 Se3 films. The XRD study confirmed the cubic crystal structure of the La2 Se3 film. The surface morphology and wettability studies revealed the nanoflake morphology with a hydrophilic surface, which could be beneficial to electrochemical reactions. The electrochemical performance of the La2 Se3 nanoflakes was evaluated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques. The La2 Se3 nanoflake electrode exhibited a maximum specific capacitance of 331 F g-1 at a scan rate of 5 mV s-1 . An electrochemical impedance study confirmed that the La2 Se3 nanoflake electrode has a better supercapacitive behavior in an aqueous electrolyte. The asymmetric supercapacitor device based on the La2 Se3 electrode in aqueous electrolyte exhibited good specific capacitance, excellent charge/discharge properties, and superior long-term cycling stability.