Synthesis of Ag Anchored Ag3VO4 Stacked Nanosheets: Toward a Negative Electrode Material for High-Performance Asymmetric Supercapacitor Devices

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• 作者：Sadayappan Nagamuthu ; Subbukalai Vijayakumar ; Kwang-Sun Ryu
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：September 1, 2016
• 年：2016
• 卷：120
• 期：34
• 页码：18963-18970
• 全文大小：564K
• 年卷期：0
• ISSN：1932-7455

文摘

Ag/α-Ag₃VO₄ stacked nanosheets were prepared through a low-temperature hydrothermal route. Cetyltrimethylammonium bromide has been used as a surfactant in the preparation of Ag/α-Ag₃VO₄ stacked nanosheets. X-ray diffraction revealed mixed metallic silver with Ag/α-Ag₃VO₄ nanosheets, which was further confirmed by field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). FESEM and HRTEM images clearly showed that the silver anchored with silver vanadium oxide stacked nanosheets. The electrochemical performance of the Ag/α-Ag₃VO₄ stacked nanosheets was examined by cyclic voltammetry and galvanostatic charge–discharge techniques. Both studies indicated that Ag/α-Ag₃VO₄ is a suitable negative electrode material for supercapacitors and delivers a maximum specific capacitance of 461 F g^–1 at a specific current of 2 A g^–1. The asymmetric supercapacitor device yielded a specific cell capacitance of 97 F g^–1 at a specific current of 1 A g^–1. The device delivers a high specific energy and specific power of 43.65 W h kg^–1 and 892.8 W kg^–1, respectively.