Abstract Delafossites, owing to their layered structural characteristics are mostly known for thermoelectric and Lithium ion battery applications. In the present paper we explore the possibility of using such a delafossite oxide viz. CuCrO2 for use as a supercapacitor material. In this regard, multivalent doping at the Cr site of CuCrO2 delafossite compound was carried out to study the effect on its electrochemical properties. The phase formation and morphological studies carried out by X-ray diffraction and Scanning Electron Microscope (SEM) techniques respectively reveal the presence of a single phase of CuCr1-x(MgTi)x/2O2 (x = 0, 0.05, 0.1, 0.15) with appropriate composition. The electrochemical properties of all the compositions were examined by cyclic voltammetry (CV) using a three-electrode system. The CV studies show an increase in specific capacitance with increasing dopant concentration. The increased electrical conductivity with dopant concentration is the reason for enhanced specific capacitance which is supported by the electrochemical impedance spectroscopic studies. The highest doped composition x = 0.15, gave a specific capacitance value of 248 Fg-1 with the scan rate of 50 mVs−1 and showed good cycle stability up to 2000 cycles.

中文翻译：

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掺杂的 CuCrO2：超级电容器应用的可能材料

摘要 Delafossites 由于其层状结构特性，在热电和锂离子电池应用中最为人所知。在本文中，我们探讨了使用这种金铁矿氧化物的可能性。CuCrO2 用作超级电容器材料。在这方面，在 CuCrO2 铜铁矿化合物的 Cr 位进行多价掺杂以研究对其电化学性能的影响。通过 X 射线衍射和扫描电子显微镜 (SEM) 技术进行的相形成和形态研究分别揭示了 CuCr1-x(MgTi)x/2O2 (x = 0, 0.05, 0.1, 0.15) 单相的存在配上适当的成分。使用三电极系统通过循环伏安法 (CV) 检查所有组合物的电化学性质。CV 研究表明，随着掺杂剂浓度的增加，比电容增加。随着掺杂剂浓度的增加，电导率增加是电化学阻抗光谱研究支持的比电容增加的原因。最高掺杂成分 x = 0.15，比电容值为 248 Fg-1，扫描速率为 50 mVs-1，并在长达 2000 次循环时显示出良好的循环稳定性。