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All Journal Jurnal Teknologi Industri Pertanian Jurnal Rekayasa Proses International Journal of Renewable Energy Development JURNAL KIMIA SAINS DAN APLIKASI Research Report - Engineering Science Jurnal Sains dan Teknologi Jurnal Pendidikan Indonesia Seminar Nasional Teknik Kimia Kejuangan Jurnal Rekayasa Proses International Journal of Applied Sciences and Smart Technologies Metalurgi International Journal of Renewable Energy Development Jurnal Rekayasa Proses
Ratna Frida Susanti
Jurusan Teknik Kimia, Fakultas Teknologi Industri Universitas Katolik Parahyangan, Bandung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences

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Journal : JURNAL KIMIA SAINS DAN APLIKASI

 1 
Synthesis and Electrochemical Properties of SnO2 Composited Activated Carbon from Coffee Ground Waste for Supercapacitor Applications Agung Nugroho; Muhammad Reza Wirayudha Pratama; Hans Kristianto; Haryo Satriya Oktaviano; Arenst Andreas Arie; Ratna Frida Susanti
Jurnal Kimia Sains dan Aplikasi Vol 26, No 8 (2023): Volume 26 Issue 8 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.8.293-299

Abstract

Biomass has been considered an alternative source of electrode materials. Converting biomass into activated carbon is one of the possible approaches. Coffee ground waste is abundant as the world’s coffee-drinking culture grows. This paper describes a study that converted coffee grounds into activated carbon and tested its feasibility for electrode materials. We use a simple pyrolysis technique (800°C) to synthesize activated carbon from waste coffee grounds, with potassium hydroxide (KOH) as an activator. Tin oxide (SnO2), which has a high theoretical capacity, was impregnated into the carbon framework using a hydrothermal method operating at 180°C for 2 hours. The X-ray diffraction (XRD) pattern and Fourier transform infrared spectroscopy (FTIR) results show that SnO2 was successfully impregnated into the carbon structure. Raman analysis also shows that the carbon structure of the activated carbon still retains despite the presence of the metal oxide during the hydrothermal synthesis. Furthermore, electrochemical measurements utilizing the galvanostatic method using a three-electrode system demonstrated that the specific capacitance of the material increased by approximately 106% at 5 A/g following SnO2 impregnation. Long cycle testing further demonstrates that including SnO2 in the carbon, structure may sustain outstanding performance even at high current densities of 5 A/g for 100 cycles with 99% capacity retention. The results demonstrate the possibility of activated carbon from coffee ground waste composited with tin oxide as supercapacitor electrodes.
Synthesis and Characterization of rGO Using a Combination Hummers Method and Hydrothermal Reduction Pardede, Maichel Letare; Jonathan, Nicholas; Irawan, Robin; Nugroho, Agung; Susanti, Ratna Frida
Jurnal Kimia Sains dan Aplikasi Vol 28, No 7 (2025): Volume 28 Issue 7 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.7.396-404

Abstract

Reduced graphene oxide (rGO) was successfully synthesized through a combination of two oxidation methods. The Hummers method was employed to synthesize graphite oxide (GrO), followed by a hydrothermal reduction technique to obtain a more ordered rGO structure. X-ray diffraction (XRD) analysis confirmed the transformation of GrO to rGO, as indicated by an interlayer spacing of 0.35–0.40 nm. This value reflects the crystalline characteristics and multilayer nature of the structure. The calculated crystallite size yielded La = 5.825 nm and Lc = 0.967 nm, suggesting a relatively high degree of crystallinity. Raman spectroscopy revealed an increase in structural disorder after the reduction process, as shown by an ID1/IG ratio of 1.771, which indicates the formation of structural defects due to the removal of oxygen-containing groups. Meanwhile, the IG/ID3 ratio of 1.039 confirms that the carbon atoms in rGO are arranged in a hexagonal graphite lattice. Additionally, the I2D/IG ratio of 0.321 indicates the presence of a multilayer structure. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX) showed that the rGO consists of graphene layers exhibiting folding and wrinkling, likely caused by thermal fluctuations during reduction at 180°C. The success of the reduction process was further supported by the increase in the C/O ratio from 2.42 in GrO to 5.39 in rGO. Electrochemical characterization by cyclic voltammetry (CV) demonstrated that rGO exhibits pseudocapacitive behavior, achieving a specific capacitance of 408.661 F/g at a scan rate of 5 mV/s. Overall, the combined synthesis approach employed in this study successfully produced rGO with favorable morphology and promising electrochemical properties, highlighting its potential for energy storage applications such as supercapacitors.
Co-Authors Adiatama, Aufa Rai Agung Nugroho Anastasia Prima Kristijarti Anastasia Prima Kristijarti Arabella Febiola Armani Arabella Febiola Armani Arenst Andreas Arenst Andreas Arie Arif Budianto Cuaca Ashanty Stenny Bahri, Elsha Pamida Dessy Natalia Edward Yonathan Natapraja Elsha Pamida Bahri Federick Dwi Putra Federick Dwi Putra Federick Dwi Putra Felisha Hapsari Tanujaya Felisha Hapsari Tanujaya Felisha Hapsari Tanujaya Garry Christianto Solihin Gelar Panji Gemilar Gelar Panji Gemilar Gelar Panji Gemilar Gelar Panji Gemilar Gemilar, Gelar Panji Haryo Satriya Oktaviano Haryo Satriya Oktaviano Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Himawan Tri Bayu Murti Petrus Ignatius Jeremy Renaldo Indra Perdana Indra Perdana Irawan, Robin Ivanna Crecentia Narulita Simanungkalit Jonathan, Nicholas Kevin Cleary Wanta Kristianto, Hans Mariskha Tri Adithia, Mariskha Tri Muhammad Reza Wirayudha Pratama Nasti, Al Nadine De Nugroho, Agung Pardede, Maichel Letare Rachel Ananda Sartika Garini Sembiring, Abraham Danofan Shinta Virdhian Shinta Virdhian Siburian, Kyfti Yolanda Simanungkalit, Ivanna Crecentia Narulita Stephen Lim Stephen Lim Susiana Prasetyo S Tabita Kristina Mora Ayu Panggabean Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Widi Astuti Yohana Fransiska Ferawati