Exfoliated graphite via ball-milling for enhanced microwave absorption and electrochemical energy storage application

IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sushree Pattnaik , Arya Das , E.V. Bhavya , Ashok Kumar Sahu , Balamati Choudhury , Mamata Mohapatra
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Abstract

Graphite and its derivatives are one of the emerging materials in energy storage and microwave absorption application. In the present study, exfoliated graphite generated from a high-pure graphite precursor through a cost-effective and environmentally friendly planetary ball milling technique has been evaluated for its supercapacitive and microwave absorption properties. The exfoliated graphite exhibits a two-fold increase in surface area compared to the high-pure graphite. The O/C ratio increased to 16.69% due to the presence of oxygen groups after ball milling, enhancing the microwave absorption and electrochemical energy storage performance of exfoliated graphite. Remarkably, the exfoliated graphite shows an enhanced microwave absorption of ∼59.15% across 8.2-12.4 GHz. Further for the realisation of the practical application, simulation study has been incorporated showing a minimum reflection loss of -25.53 dB at 9.7 GHz combining with a ferrite material. It also exhibits an excellent specific capacitance value of 177 Fg-1 at a current density of 0.5 Ag-1 for three electrode system. When assembled as a symmetric two-electrode system the exfoliated graphite exhibits an energy density of 1.66 Whkg-1 with a power density of 420 Wkg-1. This study provides a detailed investigation of exfoliated graphite as a potential material for microwave absorption and electrochemical energy storage.

Abstract Image

石墨及其衍生物是一种新兴的储能和微波吸收材料。在本研究中,利用高纯度石墨前驱体,通过经济、环保的行星球磨技术制备了剥离石墨,并对其超级电容和微波吸收性能进行了评估。与高纯度石墨相比,剥离石墨的表面积增加了两倍。由于球磨后氧基的存在,脱屑石墨的O/C比提高到16.69%,增强了脱屑石墨的微波吸收和电化学储能性能。值得注意的是,剥离石墨在8.2-12.4 GHz范围内的微波吸收增强了~ 59.15%。为了进一步实现实际应用,模拟研究表明,结合铁氧体材料,在9.7 GHz时反射损耗最小为-25.53 dB。在电流密度为0.5 Ag-1的三电极系统中,其比电容值为177 Fg-1。当作为对称双电极系统组装时,脱落石墨的能量密度为1.66 Wkg-1,功率密度为420 Wkg-1。本研究为剥脱石墨作为微波吸收和电化学储能的潜在材料提供了详细的研究。
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
Carbon Trends
Carbon Trends Materials Science-Materials Science (miscellaneous)
CiteScore
4.60
自引率
0.00%
发文量
88
审稿时长
77 days
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