Preparation and electrochemical properties of modified biochar

IF 5.8 2区生物学 Q1 AGRICULTURAL ENGINEERING Biomass & Bioenergy Pub Date : 2024-11-26 DOI:10.1016/j.biombioe.2024.107496

Yang Sun , Qianqian Yu , Tianhua Yang , Rundong Li , Shiyu Zhao

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Abstract

High-performance biochar-based supercapacitors extremely depend on the reasonable microstructure of electrode materials, so optimizing pore structure and surface properties is an important research topic. In this paper, HNO₃ and H₂O₂ were used to modify wood chip biochar, which enhanced the oxygen-containing functional groups of biochar and optimized the pore size distribution. NPCBC-45 and HPCBC-20 micropore sizes were concentrated at 0.92 nm and 0.90 nm, respectively, and the mesoporosity was 33 % and 65 %, respectively. The supercapacitors using NPCBC-45 and HPCBC-20 as electrodes exhibited excellent specific capacitance, reaching 338.88 F∙g⁻¹ and 165 F∙g⁻¹, respectively, which were increased by 137.39 % and 15.59 %, respectively. The prepared double-layer capacitor showed good cycle stability, and the cycle efficiency was 94 % after 2000 cycles. Therefore, the results of this study show that HNO₃ and H₂O₂ have application value in optimizing the microstructure of carbon material electrodes.

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改性生物炭的制备和电化学特性

高性能的生物炭基超级电容器极其依赖于电极材料合理的微观结构，因此优化孔隙结构和表面性能是一个重要的研究课题。本文采用 HNO3 和 H2O2 对木屑生物炭进行改性，增强了生物炭的含氧官能团，优化了孔径分布。NPCBC-45 和 HPCBC-20 的微孔尺寸分别集中在 0.92 nm 和 0.90 nm，中孔率分别为 33 % 和 65 %。以 NPCBC-45 和 HPCBC-20 为电极的超级电容器具有优异的比电容，分别达到 338.88 F∙g-1 和 165 F∙g-1 ，比电容分别提高了 137.39 % 和 15.59 %。所制备的双层电容器具有良好的循环稳定性，2000 次循环后的循环效率为 94%。因此，本研究结果表明，HNO3 和 H2O2 在优化碳材料电极微观结构方面具有应用价值。

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来源期刊

Biomass & Bioenergy 工程技术-能源与燃料

CiteScore

11.50

自引率

3.30%

发文量

258

审稿时长

60 days

期刊介绍： Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials. The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy. Key areas covered by the journal: • Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation. • Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal. • Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes • Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation • Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.