Volume 49 Number 3

Effect of temperature of boric acid-doped porous activated carbon preparation on the electrochemical capacitor performance

Tawatchai Kangkamano^a, Panita Kongsune^{a,b,* Sirikorn khaophonga, Sonchai Intachaia,b}

 
ABSTRACT:     This research aims to utilize coffee grounds as a sustainable precursor for activated carbon preparation, varying carbonization temperature and activator concentration and enhancing its electrochemical performance through boric acid doping. Coffee grounds, KOH, and water were mixed in weight ratios of 1:0.5:2 and 1:1.0:2, stirred, incubated at room temperature for 24 h, and then carbonized in a furnace at 400, 500, 600, and 700?C for 4 h. Struc tural, morphological, and chemical properties of the optimal conditions of AC0.5_500, AC1.0_500, AC0.5_600, and AC1.0_600 revealed evenly distributed pores, higher surface area, graphitization, and yield percentage. Subsequently, four selected samples underwent surface treatment with boric acid at 140?C for 48 h via hydrothermal treatment. Electrocapacitive behavior was investigated, revealing that among the different temperatures and activating contents in both doping and undoping samples, higher temperatures and KOH content induced higher specific capacitance values. As a result, B_AC1.0_600 exhibited good electrochemical behavior with a capacitance of approximately 282 F?g?1, an energy density of 16.54 Wh?kg?1, and a power density of 138.54 W?kg?1 at a current density of 0.5 A?g?1. These f indings suggest that porous carbons derived from waste coffee grounds and modified with boric acid hold significant potential as alternative electrode materials for supercapacitors.

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* Corresponding author, E-mail: dpanita@tsu.ac.th

Received 20 May 2024, Accepted 22 Feb 2025