Electrochemical studies on crystalline CuS as an electrode material for non-aqueous Na-ion capacitors,New Journal of Chemistry

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Electrochemical studies on crystalline CuS as an electrode material for non-aqueous Na-ion capacitors
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020/03/03 , DOI: 10.1039/c9nj06465f
Manoj Goswami _{1,

2,

3,

4,

5} , Chandrasekaran Nithya _{3,

6,

7,

8} , N. Sathish _{1,

2,

3,

4,

5} , Satendra Kumar _{2,

3,

4,

5,

9} , Netrapal Singh _{1,

2,

3,

4,

5} , A. K. Srivastava _{1,

2,

3,

4,

5} , Surender Kumar _{1,

2,

3,

4,

5}

Affiliation

Current investigations are concentrated on the development of high-performance electrode materials for sodium-ion capacitors (NICs). Copper sulphide can be employed as an electrode material for sodium-ion capacitors owing to its electrical conductivity and specific capacity. Crystalline CuS provides a large surface area for Na insertion/extraction. In this context, we have reported CuS powder synthesised via a simple wet chemical route. XRD and FT-IR studies have been carried out to determine the phase formation and confirm the purity of the CuS powder. A specific surface area of 62 m² g⁻¹ is measured by a BET surface area analyser. NICs were assembled in a non-aqueous medium with CuS particles and investigated for charge–discharge cycling in the potential window from 0.01 to 3 V. Cyclic voltammetry (CV) confirmed that at a high scan rate from 10 mV s⁻¹ to 100 mV s⁻¹, the CuS particles showed ideal capacitive behaviour. The calculated value of specific capacitance was 160 F g⁻¹ for the CuS particles. At a scan rate of 1 mV s⁻¹, 74.8% capacitive contribution was obtained from the CuS particles. Electrochemical impedance spectroscopy (EIS) revealed the interfacial interactions of the CuS particles with an Na-based electrolyte.

中文翻译：

晶体CuS作为非水Na离子电容器电极材料的电化学研究

当前的研究集中在开发用于钠离子电容器（NIC）的高性能电极材料。硫化铜由于其电导率和比容量而可以用作钠离子电容器的电极材料。结晶CuS为Na的插入/提取提供了较大的表面积。在这种情况下，我们已经报道了通过简单的湿化学路线合成的CuS粉末。已经进行了XRD和FT-IR研究以确定相的形成并确认CuS粉末的纯度。比表面积为62 m ² g ^-1通过BET表面积分析仪测量。NIC在具有CuS颗粒的非水介质中组装，并在0.01到3 V的电势窗口中研究了充放电循环。循环伏安法（CV）证实了从10 mV s ^-1到100 mV的高扫描速率s ^-1，CuS颗粒表现出理想的电容行为。CuS颗粒的比电容的计算值为160 F g ^-1。在1 mV s ^-1的扫描速率下，从CuS颗粒获得74.8％的电容贡献。电化学阻抗谱（EIS）揭示了CuS颗粒与Na基电解质的界面相互作用。

更新日期：2020-04-06

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