Composite material of NiCo-based basic carbonate and Sophora japonica leaf-derived carbon material for high-performance asymmetric supercapacitors

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals Pub Date : 2025-10-05 DOI:10.1016/j.synthmet.2025.117985

Jingwei Li , Qingqing Hu , Jinfeng Zheng , Tianlong Cao , Jianguo Zhao , Jie Song , Long Zhou , Yushu Wang , Wante Gong , Haojie Gao , Yaqi Wei , Dianlong Zhang

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Abstract

The carbon material with surface folds (the product was marked as SJC) derived from the leaves of Sophora japonica was prepared by a one-step carbonization method. NiCo-based basic carbonates (NiCoBC) were prepared by a one-step solvothermal method. Subsequently, a composite material of SJC and NiCoBC was synthesized by solvothermal method (the product was marked as NiCoBC@C). Because SJC has a high content of heteroatoms, SJC can not only increase the electronic conductivity of NiCoBC@C, but also improve wettability and promote the diffusion of electrolytes. Thanks to the structural advantages of NiCoBC@C, the electrochemical performance of NiCoBC@C is superior to that of a single component. The asymmetric supercapacitors (ASC) constructed with NiCoBC@C and activated carbon (AC) exhibit high specific capacity of 65 C g⁻¹ (at 0.5 A g⁻¹), excellent rate performance (the specific capacity remains 80 % when the current density is increased by 6 times), and a high energy density of 14.4 Wh kg⁻¹. In this work, SJC shows excellent conductivity and low cost, and effectively improves the electrochemical performance of NiCoBC@C, which provided a good guide for low-cost preparation of electrode materials and improvement of electrochemical performance.

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高性能非对称超级电容器用镍基碱式碳酸盐与槐叶碳复合材料

以槐叶为原料，采用一步炭化法制备了具有表面褶皱的碳材料（产品标记为SJC）。采用一步溶剂热法制备了镍基碱式碳酸盐（NiCoBC）。随后，通过溶剂热法合成了SJC和NiCoBC的复合材料（产品标记为NiCoBC@C）。由于SJC的杂原子含量高，SJC不仅可以提高NiCoBC@C的电子导电性，还可以提高润湿性，促进电解质的扩散。由于NiCoBC@C的结构优势，NiCoBC@C的电化学性能优于单一组分。用NiCoBC@C和活性炭（AC）构建的不对称超级电容器（ASC）具有65 C g−1的高比容量（0.5 A g−1），优异的倍率性能（当电流密度增加6倍时比容量保持80 %）和14.4 Wh kg−1的高能量密度。在本工作中，SJC表现出优异的导电性和低成本，有效地提高了NiCoBC@C的电化学性能，为低成本制备电极材料和提高电化学性能提供了良好的指导。

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来源期刊

Synthetic Metals 工程技术-材料科学：综合

CiteScore

8.30

自引率

4.50%

发文量

189

审稿时长

33 days

期刊介绍： This journal is an international medium for the rapid publication of original research papers, short communications and subject reviews dealing with research on and applications of electronic polymers and electronic molecular materials including novel carbon architectures. These functional materials have the properties of metals, semiconductors or magnets and are distinguishable from elemental and alloy/binary metals, semiconductors and magnets.