R. Suganesh, G. Venkatesh, K. M. Prabu, G. Periyasami, M. Priyadharshini, R. Ranjith, K. L. Meghanathan
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引用次数: 0
Abstract
The demand for supercapacitors with high energy and power densities has accelerated the search for efficient electrode materials. In this study, we prepared a binary composite of multi-walled carbon nanotubes (MWCNT) and nickel tungstate (NiWO4) using a simple hydrothermal method, achieving a specific capacitance of 885 F g−1 at 1 A g−1 with strong cyclic stability, maintaining 86% capacity after 5000 cycles. Electrochemical analysis revealed a shift in the charge storage mechanism of MWCNT/NiWO4 composite with “b-values” of 0.84 to low indicating a capacitive-dominant behavior with increased scan rate likely due to the formation of a double-layer and the presence of MWCNTs. The composite exhibited enhanced conductivity with a charge transfer resistance (Rct) of 0.9 Ω compared to 3.2 Ω for NiWO4 alone. This study highlights the potential of MWCNT/NiWO4 as a cost-effective, high-performance electrode material for next-generation supercapacitors.
对具有高能量和功率密度的超级电容器的需求加速了对高效电极材料的研究。在本研究中，我们采用简单的水热法制备了多壁碳纳米管（MWCNT）和钨酸镍（NiWO4）二元复合材料，在1 a g−1时获得了885 F g−1的比电容，具有很强的循环稳定性，在5000次循环后保持86%的容量。电化学分析表明，MWCNT/NiWO4复合材料的电荷存储机制发生了转变，“b值”从0.84降至较低，表明随着扫描速率的增加，MWCNT/NiWO4复合材料的电容性优势行为可能是由于双层结构的形成和MWCNTs的存在。与NiWO4单独的3.2 Ω相比，复合材料的电导率增强，电荷转移电阻（Rct）为0.9 Ω。这项研究强调了MWCNT/NiWO4作为下一代超级电容器的经济高效电极材料的潜力。
期刊介绍：
The Journal of Materials Science: Materials in Electronics is an established refereed companion to the Journal of Materials Science. It publishes papers on materials and their applications in modern electronics, covering the ground between fundamental science, such as semiconductor physics, and work concerned specifically with applications. It explores the growth and preparation of new materials, as well as their processing, fabrication, bonding and encapsulation, together with the reliability, failure analysis, quality assurance and characterization related to the whole range of applications in electronics. The Journal presents papers in newly developing fields such as low dimensional structures and devices, optoelectronics including III-V compounds, glasses and linear/non-linear crystal materials and lasers, high Tc superconductors, conducting polymers, thick film materials and new contact technologies, as well as the established electronics device and circuit materials.
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