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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) Komunikasi Fisika Indonesia Journal of Applied Materials and Technology SAINSTEK
Julnaidi, Julnaidi
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Model Matematik Eksperimental dan Validsi Momentum Takhingga Proses Kominusi dan Fragmentasi Batubara Nasution, Lukman Hakim; Weriono, Weriono; Rinaldi, Rinaldi; Julnaidi, Julnaidi; Syafar, Syafril; Harnis, Emri Juli; Irawansyah, Purnama; Hadi, Sopyan; Akmal, Nasrol; Husnadi, Andi; Haryon, Tri
SAINSTEK Vol. 12 No. 1 (2024)
Publisher : Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/js.v12i1.242

Abstract

Kominusi secara physical collision melalui prinsip linier mometum dilakukan pada sampel batubara dengan panjang 10mm, lebar dan tebal masing-masing 1mm. Jarak proses momentum adalah 100cm, tekanan udara 0.1bar hingga 3bar, dan dinding landasan berdiameter 65mm. Perubahan ukuran sampel terjadi setelah momentum, dan selanjutnya dianalisis secara matematik dengan metode penskalaan per millimeter, berfaktorkan volume dan massa material; dimana dilakukan pada kondisi sebelum dan sesudah momentum. Hasil analisis membuktikan bahwa ukuran pecahan semakin besar jika semakin jauh dari titik pusat momentum dan sebaliknya. Namun jumlah momentum akhir dan distribusi pecahan sampel tidak terdefenisikan secara matematik . Melalui metode penskalaan per millimeter yang dilakukan sebelum dan sesudah momentum berfaktorkan volume, massa dan ukuran akhir pecahan material, adalah alternatif untuk memprediksi kebutuhan energi, dan ukuran pecahan akhir yang ingin dicapai.
Harnessing multi-doping porous carbon from Musa paradisiaca L. peel waste for solid-state supercapacitors Purba, Cenora Evelynza; Nursyafni, Nursyafni; Apriwandi, Apriwandi; Kresna, Pharada; Julnaidi, Julnaidi; Nasir, Muhammad; Farma, Rakhmawati; Dewi, Rahmi; Martin, Awaludin; Hardanto, Lilik Tri; Taslim, Rika; Taer, Erman
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.187-196

Abstract

The demand for low-cost carbons with multi-doping in supercapacitors has led to a significant focus on utilizing biomass waste to produce activated carbons. The research successfully utilized Musa paradisiaca L. (MPL) peel as a porous carbon for solid-state supercapacitor. The process involved collecting banana peel waste, drying the peels using sunlight, pre-carbonization using a furnace, pH neutralization, drying, crushing carbon particles, and ensuring uniform particle size. Different concentrations of the catalytic ZnCl2 solution (300, 500, and 700 mmol/g) were selected to optimize physical and electrochemical properties. The resulting chemically activated MPL carbon powder was evaluated using SEM-EDS, XRD, and BET. MPL activated carbon with a 500 mmol/g solution of ZnCl2 was found to have optimal physical properties with a carbon percentage of 81.65%, oxygen 17.39%, phosphorus 0.42%, and boron 0.52%. Electrochemical properties were evaluated using dual-electrode system was exhibited the highest specific capacitance of 67 F/g. These findings demonstrate the potential of MPL peel waste as a high quality electrode for supercapaicor next-generation.
Areca-nut waste-derived carbon porous for sustainable electrode materials: A brief study for green-supercapacitor Nursyafni, Nursyafni; Julnaidi, Julnaidi; Taer, Erman
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.197-204

Abstract

Biomass-based porous carbon is an exceptional material with unique nano-morphological properties and a high surface area, making it an ideal candidate for improving the performance of supercapacitor electrodes. Herein, activated carbon derived novel areca-nut waste (ANW) as electrodes materials were successfully produced using a simple method. The process involved drying the ANW using pre-carbonization, chemical activation, and high-temperature pyrolysis. The zinc chloride was selected as chemical catalytic in 1 m/l solution. Subsequently, porous carbon was produced at different physical activation temperatures of 800°C, 850°C, and 900°C. The activated carbon was converted into coin-like design with an additional adhesive of PVA. The electrochemical properties were assessed using a two-electrode system in a 1 M H2SO4 electrolyte. The ANW-based supercapacitor demonstrated good electrochemical performance, with an optimal specific capacitance of 94.6 F/g at 850°C. Additionally, it exhibited an optimal energy density of 12.8 Wh/kg and a power density of 245.516 W/kg. These results suggest that porous carbon derived from ANW biomass holds promise as a sustainable working electrode for green-supercapacitor.
Self-Doped Porous Carbon Derived From Acacia Plantation Residues for Green-Supercapacitor in Sustainable Energy Applications Apriwandi, Apriwandi; Deniza, Rindhu Nabila; Martin, Awaludin; Julnaidi, Julnaidi; Taslim, Rika; Taer, Erman
Journal of Applied Materials and Technology Vol. 7 No. 1 (2025): September 2025
Publisher : AMTS and Faculty of Engineering - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.7.1.1-10

Abstract

To improve bio-organic-carbon quality for supercapacitors, consider using dual or more heteroatom for more profitable carbon-chain doping. Developing suitable sources and preparation strategies is challenging but essential. Herein, we introduce a potential carbon source derived from acacia plantation residues, doped with boron, oxygen, and phosphorus. The pore structure of this carbon material can be precisely tuned to exhibit a well-defined hierarchical arrangement of micro-, meso-, and macropores through a low-ratio of phosphoric acid (H?PO?) impregnation method combined with dual-environment (N2 and CO2) vertical pyrolysis in one step integrated. The resulting material displays a confirmed hierarchical morphology with a hierarchical transformation into tunnel pores, in specific surface area of 521.70 m²/g which contributed to high charge storage and deliverability. Additionally, the material contains significant levels of boron (0.93%), oxygen (9.19%), and phosphorus (0.34%), facilitating a reversible Faradic reaction in the working electrode. Consequently, optimized-electrode achieves a specific capacitance of 198 F/g at 1 A/g in H?SO? electrolyte. In a two-electrode system, records energy density of 14 Wh/kg (1 A/g) at a maximum power density of 670 W/kg (10 A/g). These findings suggest that the natural incorporation of boron, oxygen, and phosphorus enhances both the activity and the hierarchical pore structure of carbon derived from acacia plantation residues.
Oxygen/sulphur self-doped tunnel-like porous carbon from yellow bamboo for advanced supercapacitor applications Taer, Erman; Yanti, Novi; Putri, Rahma Lia; Apriwandi, Apriwandi; Martin, Awaludin; Julnaidi, Julnaidi; Chitraningrum, Nidya; Fudholi, Ahmad; Taslim, Rika
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 16, No 3: September 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v16.i3.pp2030-2042

Abstract

The 3D hierarchical pore structure with tunnel-like pores is essential to the performance of porous activated carbon (AC) materials used in symmetric supercapacitors. This study aimed to effect of adding (0.3, 0.5, and 0.7) M KOH reagent and heat treatment on the formation of 3D porous, tunnel-like AC derived from yellow bamboo (YB) through N2-CO2 pyrolysis at 850 °C. The AC produced had a high concentration of nanopores, becoming a valuable storage medium with favorable physical-electrochemical properties. The results showed that 0.5-YBAC had the best physical and electrochemical properties, with a carbon purity, 89.16%, micro crystallinity of 7.374 Å, and excellent amorphous porosity. Furthermore, 3D hierarchical pore structure, enriched naturally occurring heteroatoms, dopant of oxygen (10.14%) and sulfur (0.10%). A maximum surface area of 421.99 m² g⁻¹, along with a dominant combination of micro-mesopores. The electrochemical performance test of the 0.5-YBAC electrode showed a Csp of 214 F g⁻¹, with Esp 24.7 Wh kg⁻¹ and Psp 19.2 W kg⁻¹. In conclusion, this study showed the potential of YB stems to enhance the development of supercapacitors, offering superior porosity characteristics for efficient energy storage applications.
Co-Authors Ahmad Fudholi Akmal, Nasrol Apriwandi Apriwandi . Awaludin Martin Chitraningrum, Nidya Deniza, Rindhu Nabila Erman Taer Hardanto, Lilik Tri Harnis, Emri Juli Haryon, Tri Husnadi, Andi Irawansyah, Purnama Kresna, Pharada Muhammad Nasir Nasution, Lukman Hakim Novi Yanti Nursyafni, Nursyafni Purba, Cenora Evelynza Putri, Rahma Lia Rahmi Dewi Rakhmawati Farma Rika Taslim Rinaldi Rinaldi Sopyan Hadi Syafril Syafar Weriono