Electrochemical characteristics of chitosan-derived porous carbon electrodes for all-aqueous thermally regenerative batteries

doi:10.16085/j.issn.1000-6613.2024-1977

Abstract

Abstract:

To address the issues of limited electrode reaction interfaces and high transport resistance in electrodes for all-aqueous thermally regenerative batteries, chitosan was used to fabricate hierarchical porous electrodes to enhance the battery performance. The effects of ammonia concentration and the ratio of chitosan to potassium hydroxide were investigated. The chitosan-derived carbon electrodes exhibited rich hierarchical pore structure, high specific surface area, and hydrophilicity, leading to a 23% improvement in battery performance compared to conventional carbon felt electrodes. The battery performance was firstly increased with ammonia concentration and the chitosan-to-potassium hydroxide ratio, and then declined. The optimal ammonia concentration (5mol/L) and chitosan-to-potassium hydroxide ratio (5/8) yield a maximum power density of 531W/m².

Key words: thermally regenerative battery, biomass-derived porous carbon electrode, ammonia concentration, chitosan, potassium hydroxide, electrochemistry

摘要：

针对全水系热再生电池目前存在电极反应界面受限和传输阻力大等问题，本文利用壳聚糖制备分级孔电极来进一步提升电池性能，研究了氨浓度、壳聚糖与氢氧化钾比例的影响。结果表明，壳聚糖衍生碳电极具有丰富分级孔结构、高比表面积和亲水性，其获得的电池最大性能比传统采用碳毡的电池高23%，且其电池性能随着氨浓度和壳聚糖与氢氧化钾比例升高先增加后降低，存在最佳的氨浓度（5mol/L）和壳聚糖与氢氧化钾比例（5/8），获得最大功率密度为531W/m²。

关键词: 热再生电池, 生物质衍生多孔碳电极, 氨浓度, 壳聚糖, 氢氧化钾, 电化学

CLC Number:

TM911.3

LI Si, SHI Yu, ZHANG Liang, LI Jun, ZHU Xun, LIAO Qiang. Electrochemical characteristics of chitosan-derived porous carbon electrodes for all-aqueous thermally regenerative batteries[J]. Chemical Industry and Engineering Progress, 2025, 44(12): 6852-6858.

李思, 石雨, 张亮, 李俊, 朱恂, 廖强. 壳聚糖衍生多孔碳电极全水系热再生电池性能[J]. 化工进展, 2025, 44(12): 6852-6858.

Figures/Tables 8

References 27

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壳聚糖与氢氧化钾比值	比表面积/m²·g^-1	孔容/cm³·g^-1	体积密度	振实密度
3/8	208	0.35	0.054	0.068
4/8	259	0.54	0.034	0.040
5/8	444	1.65	0.023	0.027
6/8	318	1.22	0.027	0.030

壳聚糖与氢氧化钾比值	比表面积/m²·g^-1	孔容/cm³·g^-1	体积密度	振实密度
3/8	208	0.35	0.054	0.068
4/8	259	0.54	0.034	0.040
5/8	444	1.65	0.023	0.027
6/8	318	1.22	0.027	0.030