Kanani Darshna B, Surana Karan, Kapdi Yash G, Bariya Sanjay N, Machhi Hiren K, Panjabi Sanjay H, Deshpande M P, Soni Saurabh S
Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar 388120, Gujarat, India.
Department of Chemical Sciences, P. D. Patel Institute of Applied Sciences, Charotar University of Science and Technology, Changa 388421, Gujarat, India.
J Colloid Interface Sci. 2025 Dec 15;700(Pt 1):138376. doi: 10.1016/j.jcis.2025.138376. Epub 2025 Jul 7.
Zn-ion batteries have been explored rigorously in the last decade owing to its high abundance, ease of availability, and theoretical specific capacity, which makes it a viable alternative to Li-ion batteries. Carbonizing waste biomass for electrode material can make the battery sustainable and cost-effective but the involvement of difficult cleaning and high temperature calcination process negates the cost-effectiveness. As a viable solution, a simple low temperature chemical treatment of spirogyra biomass is being proposed as an alternative to carbon-based cathode material in this work. The treatment of dried spirogyra biomass with orthophosphoric acid led to enhancement in specific surface area, thermal stability, and chemical functional groups. After treatment, the treated material is utilized as an iodine host in aqueous rechargeable Zn-I battery. The battery delivers a high specific capacity of 440 mAh g at 3C rate with an excellent coulombic efficiency of 97 %, owing to a dual charge storage offered by the treated spirogyra biomass and I-catholyte. Additionally, the Zn-treated spirogyra battery without I-catholyte delivers a specific capacity of 116 mAh g at 3C rate. The carboxyl group present in the treated spirogyra biomass cathode contributes with I-catholyte in better retention of Zn ions which is identified by the ex-situ measurements and computational study, thereby displaying higher capacity performance.
在过去十年中，锌离子电池因其丰富的储量、易于获取以及理论比容量，而受到了深入研究，这使其成为锂离子电池的一个可行替代方案。将废弃生物质碳化作为电极材料可使电池具备可持续性且成本效益高，但复杂的清洗过程和高温煅烧过程降低了成本效益。作为一个可行的解决方案，本文提出对水绵生物质进行简单的低温化学处理，以替代碳基阴极材料。用正磷酸处理干燥的水绵生物质可提高比表面积、热稳定性和化学官能团。处理后，该材料被用作水系可充电锌碘电池中的碘宿主。由于处理后的水绵生物质和碘阴极电解液提供了双重电荷存储，该电池在3C倍率下具有440 mAh g的高比容量和97%的优异库仑效率。此外，不含碘阴极电解液的锌处理水绵电池在3C倍率下的比容量为116 mAh g。通过非原位测量和计算研究确定，处理后的水绵生物质阴极中存在的羧基与碘阴极电解液共同作用，能更好地保留锌离子，从而展现出更高的容量性能。
