Green synthesis of oxygen-enriched tobacco stem-derived porous carbon via pre-oxidation and self-activation for high-performance supercapacitors

IF 4.1 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2024-06-13 DOI:10.1016/j.ces.2024.120379

Chao Li , Xiaowei Pan , Senlin Chen , Hong Tao , Dongjie Yang , Xueqing Qiu , Fangbao Fu

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Abstract

The use of agricultural and forestry waste to produce functional materials is a significant approach to achieving carbon neutrality. Herein, a green and cost-effective pre-oxidation and self-activation approach has been adapted to produce porous carbon from discarded tobacco stems for supercapacitors. The analysis of tobacco stem structure evolution reveals that the pre-oxidation process facilitated the cross-linked structure of the tobacco stem and the formation of KCl crystals, endowing tobacco stem-derived porous carbon with abundant micropores and high oxygen content during self-activation. The impact of pre-oxidation and self-activation temperature on the carbon structural characteristics of tobacco stems is systematically investigated. The optimized porous carbon exhibited a specific capacitance of 320 F/g at 0.5 A/g with good rate capability. Besides, it delivered a high energy density of 10.68 Wh/kg in a symmetrical supercapacitor. This work provides a green route for preparing carbon electrode materials for high-performance supercapacitors using agricultural and forestry wastes.

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通过预氧化和自激活绿色合成富氧烟草茎源多孔碳，用于高性能超级电容器

利用农业和林业废弃物生产功能材料是实现碳中和的重要方法。在此，我们采用了一种绿色且经济有效的预氧化和自激活方法，利用废弃的烟草茎生产多孔碳，用于超级电容器。对烟草茎结构演变的分析表明，预氧化过程促进了烟草茎的交联结构和氯化钾晶体的形成，使烟草茎衍生的多孔碳在自活化过程中具有丰富的微孔和高含氧量。系统研究了预氧化和自活化温度对烟草茎秆碳结构特征的影响。优化后的多孔碳在 0.5 A/g 时的比电容为 320 F/g，具有良好的速率能力。此外，它还能在对称超级电容器中提供 10.68 Wh/kg 的高能量密度。这项研究为利用农林废弃物制备高性能超级电容器的碳电极材料提供了一条绿色途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.

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