Sahu Kishor Kumar, Raj Benjamin, Basu Suddhasatwa, Mohapatra Mamata
CSIR-Institute of Minerals and Materials Technology, Bhubaneswar 751013, India.
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh 201 002, India.
ACS Omega. 2021 Jan 5;6(2):1108-1118. doi: 10.1021/acsomega.0c03899. eCollection 2021 Jan 19.
The search for low-cost environmentally benign promising electrode materials for high-performance electrochemical application is an urgent need for an applaudable solution for the energy crisis. For this, the present attempt has been made to develop a scalable synthetic strategy for the preparation of pure and dual-phase copper oxide self-hybrid/self-assembled materials from a copper oxalate precursor using the calcination route. The obtained samples were characterized by means of various physicochemical analytical techniques. Notably, we found that the BET surface area and pore volume of copper oxides measured by N adsorption-desorption decrease with the elevation of calcination temperature. From the XRD analysis, we observed the formation of a CuO cubic phase at low temperatures and a CuO monoclinic phase at high temperatures (i.e., 450 and 550 °C). FTIR and RAMAN spectroscopy were employed for bonding and vibrational structure analysis. The self-assembled dual-phase copper oxide particle as a pithecellobium-type hierarchical structure was observed through SEM of the sample prepared at 350 °C. The surface morphological structure for the samples obtained at 450 and 550 °C was a bundle-like structure developed though columnar self-assembling of the particles. All the above techniques confirmed the successful formation of CuO/CuO nanoparticles. Afterward, the electrochemical properties of the as-synthesized copper oxides reinforced by introducing carbon black (10% wt) were explored via cyclic voltammetry, electrochemical impedance spectroscopy, and galvanometric charge-discharge analysis. The CuO system exhibits the maximum specific capacitance performance value of 1355 F/g, whereas in the CuO system (at 450 and 550 °C), it possesses values of 903 and 724 F/g at a scan rate of 2 mV/s. This study reveals that the electrochemical properties of CuO are better than those of the CuO nanoparticles, which could be ascribed to the high surface area and morphology. The present assessment of the electrochemical properties of the developed material could pave the way to a low-cost electrode material for developing other high-performance hybrid electrodes for supercapacitor or battery applications.
寻找低成本、环境友好且有前景的电极材料用于高性能电化学应用，是解决能源危机的一个值得称赞的迫切需求。为此，目前已尝试开发一种可扩展的合成策略，通过煅烧路线从草酸铜前驱体制备纯相和双相氧化铜自杂化/自组装材料。所得样品通过各种物理化学分析技术进行表征。值得注意的是，我们发现通过N吸附-脱附测量的氧化铜的BET表面积和孔体积随煅烧温度的升高而降低。通过XRD分析，我们观察到在低温下形成了CuO立方相，在高温（即450和550°C）下形成了CuO单斜相。FTIR和拉曼光谱用于键合和振动结构分析。通过对在350°C制备的样品进行SEM观察，发现自组装双相氧化铜颗粒为象耳豆型分级结构。在450和550°C获得的样品的表面形态结构是通过颗粒的柱状自组装形成的束状结构。所有上述技术均证实成功形成了CuO/CuO纳米颗粒。之后，通过循环伏安法、电化学阻抗谱和恒电流充放电分析，探索了引入炭黑（10%重量）增强的合成氧化铜的电化学性能。CuO体系在扫描速率为2 mV/s时表现出最大比电容性能值1355 F/g，而在CuO体系（450和550°C）中，其值分别为903和724 F/g。这项研究表明，CuO的电化学性能优于CuO纳米颗粒，这可能归因于其高表面积和形态。目前对所开发材料的电化学性能评估可为开发用于超级电容器或电池应用的其他高性能混合电极的低成本电极材料铺平道路。
