Layer-Structured Copper Antimony Chalcogenides (CuSbSexS2鈥?i>x): Stable Electrode Materials for Supercapacitors

详细信息    查看全文

• 作者：Karthik Ramasamy ; Ram K. Gupta ; Soubantika Palchoudhury ; Sergei Ivanov ; Arunava Gupta
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：January 13, 2015
• 年：2015
• 卷：27
• 期：1
• 页码：379-386
• 全文大小：641K
• ISSN：1520-5002

文摘

The ever-growing need for energy generation and storage applications demands development of materials with high performance and long-term stability. A sizable number of chalcogenide-based materials have been investigated for supercapacitor applications. Layer-structured chalcogenides are advantageous in terms of providing large surface area with good ionic conductivity and ability to host a variety of atoms or ions between the layers. CuSbS₂ is a ternary layered chalcogenide material that is composed of earth abundant and less-toxic elements. For the first time, we have developed a simple colloidal method for the synthesis of CuSbSe_xS_2鈥?i>x mesocrystals over the whole composition range (0 鈮?x 鈮?2) by substitution of S with Se. Our approach yields mesocrystals with belt-like morphology for all the compositions. X-ray diffraction results show that substitution of sulfur with selenium in CuSbS₂ enables tuning the width of the interlayer gap between the layers. To investigate the suitability of CuSbSe_xS_2鈥?i>x mesocrystals for supercapacitor applications, we have carried out electrochemical measurements by cyclic voltammetry and galvanostatic charge鈥揹ischarge measurements in 3 M KOH, NaOH and LiOH electrolytes. Our investigations reveal that the mesocrystals exhibit promising specific capacitance values with excellent cyclic stability. The unique properties of CuSbSe_xS_2鈥?i>x mesocrystals make them attractive both for solar energy conversion and energy storage applications.