超级电容器
选区衍射
材料科学
扫描电子显微镜
碳化
碳纤维
化学工程
透射电子显微镜
分析化学(期刊)
拉曼光谱
法拉第效率
电容
核化学
纳米技术
电化学
电极
化学
复合材料
色谱法
光学
物理
物理化学
复合数
工程类
作者
Kathyayini Nagaraju,Gopalakrishna Byatarayappa,R Srilakshmi,Umananda M. Bhatta,Krishna Venkatesh,N. Nagaraju
标识
DOI:10.1016/j.inoche.2023.111404
摘要
Extraction of biodiesel from Pongamia pinnata seeds is a vital "Green" synthesis process which is reliable, sustainable, and eco-friendly. The cake obtained during this process is generally utilized as a fertilizer and rich in carbon & nitrogen content. In the present work, initially the material was subjected to carbonization process (PC) was activated with three different porogens such as KOH, KCl, K2HPO4 (K+ as common ion) and labeled as PC-1, PC-2 & PC-3 respectively. The physico-chemical properties of all the carbon materials were investigated by various analytical techniques such as Powder X-Ray diffraction (P-XRD), Brunner Emmett Teller (BET), Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM-EDS), Transmission Electron Microscopy and Selected Area Electron Diffraction (TEM-SAED), & Raman spectroscopy. PC-1 exhibited better electrochemical performance than the other activated carbons (ACs) & PC with specific capacitance (Cs) of 253F/g at 2.5 A/g, retained 75% Cs at the end of 10,000th cycle and 100% coulombic efficiency in 1 M KOH solution. The symmetric supercapacitor coin cell (SSC) using PC-1 (1 M KOH) exhibited a high Cs of 112F/g at scan rate of 2 mV/s, a maximum energy density (ED) of 38.6 Wh/kg and power density (PD) of 9 kW/kg. Interestingly, the coin cell demonstrated a total of 100 k cycles at high current density of 25 A/g with time gap of fifteen days for 50 k cycles. Six SSCs connected in series were successfully used to power up a flashlight with 15 white LED's (each 4 V) connected in series for 3 min.
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