One-step carbonization-activation synthesis of pomelo peel derived N, O-doped porous carbon for enhanced supercapacitve performance

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-04-02 DOI:10.1016/j.diamond.2025.112276

Rui Zhang, Duoyu Zhou, Kenan Yi, Songsong Xu, Lina Su, Jianhua Liu, Li Li, Fengyang Yu

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引用次数: 0

Abstract

Biomass-derived porous carbon has gained significant interest as ideal electrode material for supercapacitor owing to eco-sustainability, cost-effectiveness, and unique inherent microstructure. Herein, N, O co-doped porous carbons have been successfully obtained by single-step carbonization-activation method using waste pomelo peel as carbon source and KHCO₃/CO(NH₂)₂ as activators. In the synthesis process, KHCO₃ as a pore-forming agent plays an important role, and CO(NH₂)₂ is used to assist the pore-forming process as well as N doping. Benefiting from high specific surface area (1378.5 m²·g⁻¹), predominant microporous structure and O, N co-doping, the best N, O co-doped porous carbon (denoted as PKNAC) exhibits high specific capacitance (364.5 F·g⁻¹, 1 A·g⁻¹), favorable rate performance (retaining 63.86 %, 50 A·g⁻¹) and good cycling durability (97.32 % retention, 20,000 cycles). Notably, the assembled quasi-flexible symmetrical supercapacitor in PVA/KOH gel electrolyte achieves the energy density of 13.7 Wh·kg⁻¹ at a power density of 350 W·kg⁻¹. This work offers a convenient approach to prepare heteroatom-doped porous carbons from biomass waste for high-performance energy storage.

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一步碳化活化合成柚皮衍生氮氧掺杂多孔碳以增强其超电容性能

生物质衍生多孔碳由于其生态可持续性、成本效益和独特的内在微观结构而成为超级电容器理想的电极材料。本文以废柚皮为碳源，以KHCO3/CO(NH2)2为活化剂，采用单步炭化活化法制备了N， O共掺杂多孔碳。在合成过程中，KHCO3作为成孔剂起重要作用，CO(NH2)2辅助成孔，N掺杂。由于具有较高的比表面积（1378.5 m2·g−1），优越的微孔结构和O， N共掺杂，最佳的N， O共掺杂多孔碳（PKNAC）具有较高的比电容（364.5 F·g−1,1 A·g−1），良好的倍率性能（保持63.86%,50 A·g−1）和良好的循环耐久性（保持97.32%,20,000次循环）。值得注意的是，在PVA/KOH凝胶电解质中组装的准柔性对称超级电容器在350 W·kg - 1的功率密度下，能量密度达到13.7 Wh·kg - 1。本研究为从生物质废弃物中制备杂原子掺杂多孔碳提供了一种方便的方法。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.