Effect of freezing pretreatment on the performance of activated carbon from coconut shell for supercapacitor application

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2022-01-01 DOI:10.1016/j.matlet.2021.130934

Meigen Deng, Junlong Wang, Qi Zhang

引用次数: 15

Abstract

To reduce the KOH consumption during the activating process of activated carbon (AC) preparing, freezing pretreatment was carried out on coconut shell (CS), which resulted in increased specific surface area and total pore volume in the pyrolysed carbon from frozen CS (FCS). ACs were prepared from CS and FCS with different KOH/carbon ratios. Compared with AC from CS with KOH/carbon ratio of 5:1, Frozen AC from FCS with KOH/ carbon ratio of 3:1 possesses larger specific surface area (2410 m² g⁻¹), wider average pore diameter (3.35 nm), higher specific capacitance (395 F g⁻¹ at a discharging current density of 0.3 A g⁻¹) and better power performance.

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冷冻预处理对超级电容器用椰壳活性炭性能的影响

为降低活性炭(AC)制备活化过程中KOH的消耗，对椰壳(CS)进行冷冻预处理，使冷冻后的椰壳热解炭(FCS)的比表面积和总孔体积增大。以不同KOH/carbon比的CS和FCS制备了ACs。与KOH/carbon比为5:1的CS相比，KOH/carbon比为3:1的FCS冷冻AC具有更大的比表面积(2410 m2 g−1)，更宽的平均孔径(3.35 nm)，更高的比电容(放电电流密度为0.3 ag−1时395 F g−1)和更好的功率性能。

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

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive