Isacfranklin Melkiyur, Rathinam Yuvakkumar, Ganesan Ravi, Velauthapillai Dhayalan
Department of Physics, Alagappa University, Karaikudi 630003, Tamil Nadu, India.
Adjunct Professor, Department of Physics, Chandigarh University, Mohali 140413, Punjab, India.
ACS Omega. 2023 Mar 27;8(13):11700-11708. doi: 10.1021/acsomega.2c04998. eCollection 2023 Apr 4.
In the modern civilized world, energy scarcity and associated environmental pollution are the center of focus in the search for reliable energy storage and harvesting devices. The need to develop cheaper and more competent binder-free electrodes for high-performance supercapacitors has attracted considerable research attention. In this study, two different procedures are followed to enhance the growth of carbon nanotubes (CNT-E and CNT-NF) directly coated on a Ni-foam substrate by a well-functioning chemical vapor deposition (CVD) method. Thus, directly grown optimized CNT electrodes are used as electrodes for electrochemical devices. Furthermore, solid-state symmetric supercapacitors are fabricated using CNT-NF//CNT-NF, and fruitful results are obtained with maximum specific capacitance (250.51 F/g), energy density (68.19 Wh/kg), and power density (2799.77 W/kg) at 1 A/g current density. The device exhibited good cyclic stability, with 92.42% capacitive retention and 99.68% Coulombic efficiency at 10 000 cycles, indicating the suitability of the electrodes for practical applications. This study emphasizes the importance of studying the direct growth of binder-free CNT electrodes to understand the actual behavior of electrodes and the proper storage mechanism.
在现代文明世界中，能源短缺及相关环境污染是寻找可靠储能和能量收集装置时的关注焦点。开发用于高性能超级电容器的更廉价且性能更优的无粘结剂电极的需求已引起了相当多的研究关注。在本研究中，采用了两种不同的方法来促进通过功能良好的化学气相沉积（CVD）法直接涂覆在泡沫镍基底上的碳纳米管（CNT-E和CNT-NF）的生长。因此，直接生长的优化碳纳米管电极被用作电化学装置的电极。此外，使用CNT-NF//CNT-NF制备了固态对称超级电容器，在1 A/g电流密度下获得了丰硕成果，最大比电容为250.51 F/g、能量密度为68.19 Wh/kg、功率密度为2799.77 W/kg。该装置表现出良好的循环稳定性，在10000次循环时电容保持率为92.42%，库仑效率为99.68%，表明这些电极适用于实际应用。本研究强调了研究无粘结剂碳纳米管电极直接生长以了解电极实际行为和适当存储机制的重要性。
