Jia Han, Shahi Sabina, Shrestha Lok Kumar, Ariga Katsuhiko, Michinobu Tsuyoshi
Department of Materials Science and Engineering, Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8552 Japan
Central Department of Chemistry, Tribhuvan University Kirtipur Kathmandu 44613 Nepal.
RSC Adv. 2023 Jul 18;13(31):21502-21509. doi: 10.1039/d3ra03349j. eCollection 2023 Jul 12.
With the emergence of the energy crisis and the development of flexible electronics, there is an urgent need to develop new reliable energy supply devices with good flexibility, stable energy storage, and efficient energy transfer. Porous carbon materials have been proven to enhance the efficiency of ion transport, as the nanospaces within them serve as pathways for mass transport. However, they have been mainly investigated in the electrodes of supercapacitors and batteries. To elucidate their function in the solid electrolytes, we introduced C-based carbonized nanospheres into PVA/TEMPO-cellulose-based hydrogels by exploiting the electrostatic interaction between the carboxyl groups of TEMPO-cellulose and the carbonized nanospheres. The obtained hydrogels were further utilized as the solid electrolytes for the supercapacitors. Through a comprehensive investigation, we found that the carbonized nanospheres can act as physical crosslinking points and increase the maximum stress of the hydrogel from 0.12 to 0.31 MPa without affecting the maximum strain. In addition, the nanospaces of the carbonized nanospheres provided a pathway for ion transport, improving the capacitance of the supercapacitor from 344.83 to 369.18 mF cm at 0.5 mA cm. The capacitance retention was also improved from 53% to 62% at 10 mA cm. Collectively, this study provides new insights into the application of carbonized materials to solid electrolytes.
随着能源危机的出现和柔性电子学的发展，迫切需要开发具有良好柔韧性、稳定储能和高效能量转移的新型可靠能源供应装置。多孔碳材料已被证明能提高离子传输效率，因为其内部的纳米空间可作为物质传输的通道。然而，它们主要在超级电容器和电池的电极中得到研究。为了阐明它们在固体电解质中的功能，我们利用TEMPO纤维素的羧基与碳化纳米球之间的静电相互作用，将碳基碳化纳米球引入基于PVA/TEMPO纤维素的水凝胶中。所制备的水凝胶进一步用作超级电容器的固体电解质。通过全面研究，我们发现碳化纳米球可作为物理交联点，在不影响最大应变的情况下，将水凝胶的最大应力从0.12 MPa提高到0.31 MPa。此外，碳化纳米球的纳米空间为离子传输提供了通道，在0.5 mA cm时将超级电容器的电容从344.83 mF cm提高到369.18 mF cm。在10 mA cm时，电容保持率也从53%提高到62%。总体而言，本研究为碳化材料在固体电解质中的应用提供了新的见解。
