水热液化藻类衍生碳作为超级电容器的可持续碳电极材料

C Pub Date : 2024-06-01 DOI:10.3390/c10020051
Kingsford Asare, Abhijeet Mali, Md Faruque Hasan, Philip Agbo, Abolghasem Shahbazi, Lifeng Zhang
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引用次数: 0

摘要

随着全球对可持续发展意识的提高,用于超级电容器的生物质衍生碳电极材料日益受到关注。在这项研究中,我们首次探索了利用微藻水热液化(HTL)产生的碳副产品(本文称为藻类衍生碳(ADC))制备可持续碳电极材料用于高性能超级电容器开发的可行性。具体而言,我们研究了使用多种活化试剂对碳进行活化,以及对所获得的 ADC 进行氮和铁掺杂,以提高其电化学性能。我们使用扫描电子显微镜 (SEM)、拉曼光谱、傅立叶变换红外光谱 (FTIR)、X 射线光电子能谱 (XPS) 以及 BET 表面积和孔隙分析对活化和掺杂 ADC 的结构进行了表征、并通过以 1 M H2SO4 为电解质的装配式对称双电极电池,使用循环伏安法(CV)、电静态充放电法(GCD)、阻抗和循环稳定性对 ADC 的结构及其电化学性能进行了评估。结果发现,使用 KOH 活化的 ADC(KOH-ADC)显示出最佳的电化学性能,其比电容是原始 ADC 的 14.1 倍,在电流密度为 0.5 A/g 的 GCD 测试中达到 234.5 F/g。KOH-ADC 还具有出色的电容保持率(在 10 A/g 的高电流密度下循环 10,000 次后保持率为 97%),可长期稳定运行。这项研究为利用海藻 HTL 处理后产生的碳副产品开发可持续的超级电容器电极材料指明了方向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Algae Derived Carbon from Hydrothermal Liquefaction as Sustainable Carbon Electrode Material for Supercapacitor
With the worldwide awareness of sustainability, biomass-derived carbon electrode materials for supercapacitors have attracted growing attention. In this research, for the first time, we explored the feasibility of making use of the carbon byproduct from hydrothermal liquefaction (HTL) of microalgae, termed herein as algae-derived carbon (ADC), to prepare sustainable carbon electrode materials for high-performance supercapacitor development. Specifically, we investigated carbon activation with a variety of activating reagents as well as N- and Fe-doping of the obtained ADC with the intention to enhance its electrochemical performance. We characterized the structure of the activated and doped ADCs using scanning electron microscope (SEM), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and BET surface area and pore analysis, and correlated the ADCs’ structure with their electrochemical performance as evaluated using cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), impedance, and cycle stability through an assembled symmetric two-electrode cell with 1 M H2SO4 as electrolyte. It was found that the ADC that is activated using KOH (KOH-ADC) showed the best electrochemical performance, and its specific capacitance was 14.1-fold larger with respect to that of the raw ADC and reached 234.5 F/g in the GCD test at a current density of 0.5 A/g. The KOH-ADC also demonstrated excellent capacitance retention (97% after 10,000 cycles at a high current density of 10 A/g) for stable long-term operations. This research pointed out a promising direction to develop sustainable electrode materials for supercapacitors from the carbon byproduct produced after HTL processing of algae.
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