通过酸和氧化激活顺序变化,比较大米皮衍生的活性碳的特异电容
Nasser A M Barakat1, Mohamed S Mahmoud2,3, Hager M Moustafa2
1Faculty of Engineering, Chemical Engineering Department, Minia University, El-Minia, 61516, Egypt. nasbarakat@mu.edu.eg.
Scientific reports
|January 17, 2024
概括
优化皮活性炭的化学激活顺序和参数可显著提高特异电容. 碳化前的酸处理使电容增加了21%,而碳化后的氧化处理使电容增加了一倍.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 从大米中提取的活性炭是储能应用的有希望的材料.
- 活性炭的特异电容高度依赖于其合成方法,特别是化学激活过程.
- 了解激活步骤顺序和参数的影响对于优化材料性能至关重要.
研究的目的:
- 为了研究化学激活步骤顺序 (碳化前与碳化后) 对来自大米的活性碳的特异电容的影响.
- 为了确定最大化特定电容的最佳过程参数 (温度,化学剂体积).
- 阐明无机成分在提高电化学性能方面的作用.
主要方法:
- 在碳化之前或之后,使用酸 (H3PO4) 和氧化物 (KOH) 来化学激活米.
- 在预激活过程中,碳化温度有所变化 (600-1050°C).
- 在激活后,对H3PO4和KOH溶液的体积进行了系统的改变.
主要成果:
- 对于碳化前的激活,最佳温度是900°C.
- 对于碳化后的激活,H3PO4的最佳体积为30mL/g,KOH为21mL/g.
- 碳化前的H3PO4处理由于保留的SiO2增加了21%的特定电容;碳化后的KOH处理通过嵌入SiO2和KHCO3.3将电容翻了一番.
结论:
- 化学激活的顺序显著影响了来自大米的活性炭的特异电容.
- 具体的工艺参数,包括温度和化学剂体积,必须针对每个激活序列进行优化.
- 这项研究为开发使用可持续的米前体的高性能超级电容器提供了途径.
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