Synthesis of graphene by electrochemical exfoliation from petroleum coke for electrochemical energy storage application

IF 2.9 Q2 ELECTROCHEMISTRY Journal of Electrochemical Science and Engineering Pub Date : 2023-11-14 DOI:10.5599/jese.2005
Dhana Priya Singaramohan, Saravanathamizhan Ramanujam, Manimozhi Veerasamy, Santhoshini Priya Thomas, Balasubramanian Natesan
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Abstract

The objective of the present work was to synthesize a graphene-like structure from petroleum coke (pet coke). Graphene is a potential alternative conducting material to replace traditional electrode materials such as indium tin oxide. The phosphoric acid was used to activate the pet coke in conditions where the coke to acid ratio is varied as 1:1, 1:2, 1:3, 1:4 and 1:5. The samples were kept at different temperatures in the furnace maintained in inert atmospheric conditions at 400, 500 and 600 °C for activation time intervals of 1, 2 and 3 h. The extent of activation of pet coke samples was characterized by their yield and iodine number. For the optimized conditions (600 °C, 3 h, 1:4 coke to acid ratio), the activated pet coke was moulded and taken as the anode for electrochemical exfoliation using platinum wire as cathode, and 0.3 M H2SO4 solution as electrolyte. The electrochemical exfoliation was carried out using DC power supply at 22 V for 8 h, and the obtained exfoliated product was analysed by surface-sensitive techniques (XRD, Raman and SEM). The specific capacitance values were measured using cyclic vol­tammetry in KOH, Na2SO4 and H2SO4 electrolytes. The highest specific capacitance value of 40 F g-1 for the scanning rate of 25 mV s-1 was obtained in 1 M H2SO4. It was confirmed that graphene-like structure produced from activated pet coke can be used as an alternate material for supercapacitor applications.
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以石油焦为原料,电化学剥落合成石墨烯的电化学储能研究
以石油焦(pet焦)为原料合成类石墨烯结构物。石墨烯是一种潜在的替代导电材料,可以取代传统的电极材料,如氧化铟锡。在焦酸比为1:1、1:2、1:3、1:4、1:5的条件下,用磷酸对聚酯焦进行活化。在400℃、500℃和600℃的惰性大气条件下,在不同的温度下保持焦炭样品,活化时间间隔为1、2和3 h。pet焦炭样品的活化程度通过其产率和碘值来表征。在优化条件(600℃,3 h,焦酸比1:4)下,以活化聚酯焦为阳极,铂丝为阴极,0.3 M H2SO4溶液为电解液进行电化学剥离。在22 V直流电源下进行8 h的电化学剥离,并采用XRD、Raman和SEM等表面敏感技术对剥离产物进行分析。采用循环伏安法测定了KOH、Na2SO4和H2SO4电解液中的比电容值。在1 M H2SO4溶液中,扫描速率为25 mV s-1时,比电容值最高为40 gf -1。实验证实了由活化的pet焦炭制备的类石墨烯结构可作为超级电容器的替代材料。
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来源期刊
CiteScore
3.60
自引率
27.30%
发文量
90
审稿时长
6 weeks
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