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All Journal Jurnal Ilmiah WUNY Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Rekayasa Mesin Journal of Environmental Engineering and Sustainable Technology International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Jurnal Polimesin
Purnami Purnami
Brawijaya University
Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health

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THE ROLE OF VISIBLE LIGHT IN OPTIMIZING HYDROGEN YIELD DURING ALKALINE ELECTROLYSIS Santoso, Mardi; Ahmad, Anton Royanto; Purnami, Purnami; Hamidi, Nurkholis
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2026.007.01.13

Abstract

Hydrogen is a clean energy carrier, but the efficiency of its production via alkaline water electrolysis remains a key challenge due to high energy consumption and limited reaction kinetics. This study explores the potential of visible light irradiation—specifically red, green, and blue LEDs—to enhance hydrogen production efficiency under standard electrolysis conditions. Using NiFe electrodes in 30% KOH solution, experiments were conducted at 9 V and 1.5 A for 10 minutes, with each LED source (700 lumens) positioned 50 mm above the electrolyte. Hydrogen yield was recorded via a water displacement method, and temperature changes were monitored to assess photothermal effects. Results showed a significant improvement in hydrogen production under light exposure, with blue light yielding the highest output (17.85 mL), followed by green (13.15 mL), red (10.65 mL), and the non-irradiated control (8.15 mL). These enhancements are attributed to the synergistic effects of photon energy and thermal stimulation, which improve electrochemical kinetics. This study provides evidence that visible light can be an effective, low-cost method to boost hydrogen evolution performance in alkaline electrolysis systems.
THE EFFECT OF DIAMETER VARIATION ON THE COMBUSTION CHARACTERISTICS OF METHYL LAURATE AND METHYL OLEATE DROPLETS Saktyawan, Helmi; Santoso, Rangga; Yuliati, Lilis; Purnami, Purnami
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2026.007.01.15

Abstract

The demand for fuel continues to increase while the availability of fossil fuel energy is decreasing day by day. This study aims to investigate the effect of diameter variation on the combustion characteristics of methyl laurate and methyl oleate droplets. Observations were made on the combustion characteristic of methyl laurate and methyl oleate droplets at the diameter variation stage. This research uses the experimental method (experimental research). The independent variables include diameters of 0.7 mm, 0.8 mm, 0.9 mm, 1.00 mm, 1.1 mm, and 1.2 mm. The fuels employed in this study were methyl laurate and methyl oleate. The observed dependent variables included ignition delay time, burning time, droplet temperature, droplet diameter evolution, and flame height. The findings obtained from the visualization of ignition delay time for methyl oleate with varying diameters revealed that it is more challenging to ignite than methyl laurate. Furthermore, the burning time of methyl oleate with different diameters was found to exceed that of methyl laurate. It was observed that the droplet temperature of methyl oleate increased to a greater extent than the droplet temperature of methyl laurate. Furthermore, the flame height of methyl oleate was found to be higher and exhibited greater variability, in contrast to the more stable behavior exhibited by methyl laurate. The fluctuation in the diameter of methyl oleate is in contrast to the stability exhibited by methyl laurate with regard to increasing droplet size.
Development of phenolic-modified activated carbon for reduced energy band gap and improved semiconductor performance Rahmadanti Rahmadanti; Agung Sugeng Widodo; Sulistyono Sulistyono; Purnami Purnami
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.8234

Abstract

This study aims to develop more efficient activated carbon-basedsemiconductor materials through modification with phenolic compounds to reduce the energy gap and increase adsorption capacity. Activated carbon was modified by adding phenolic compounds, then characterized using FTIR, UV-Vis, SEM, and EDS to analyze structural, morphological, and electronic changes. The UV-Vis characterization results showed that the AC 70 + F 30 sample experienced a wavelength shift towards the x-axis, which indicates a decrease in energy gap and is confirmed by Tauc plot analysis from 3.60 eV to 2.98 eV. SEM-EDS results revealed changes in pore morphology and a decrease in carbon content due to the interaction between activated carbon and phenolic compounds. These findings indicate that phenolic modification effectively reduces the energy gap and improved charge-transfer characteristics, thereby contributing to the development of more environmentally friendly and efficient activated carbon-based semiconductor materials.
Co-Authors Agung Sugeng Widodo Akbar, Dekrit H. Anggara, Teuku Anton Royanto Ahmad ARDIANSYAH ARDIANSYAH Daroini, Ahmad Najih Denny Widhiyanuriyawan Dewi, Fransisca Gayuh Utami Dhimas Nur Cahyadi Dina Novera Serfandi Esiliy , Rehab Ragay Faiz, Naufal Muhammad I Nyoman Gede Wardana ING Wardana ING. Wardana, ING. Lilis Yuliati Mardi Santoso Mas'ud, Sifa'ul Mega Nur Sasongko Mohamad, Effendi Bin Nurkholis Hamidi Nurkholis Hamidy Oyong Novareza Paepenan, Semuel Poumer Putu Hadi Setyarini Rahmadanti Rahmadanti Saktyawan, Helmi Santoso, Rangga Schulze, Ajani Aiman Schulze, Klauss Sinurat, David Fernando Siswahyudianto Slamet Wahyudi Sugeng Prayitno Budio Sulaiman, Abdul Mudjib Sulistyono Sulistyono Sulistyono Sulistyono Syahputra, Hogi Veronika K, Veronika Wardhani, Angelia Kusuma widya wijayanti Willy Satrio Nugroho Yepy Komaril Sofi’i Yusuf, M Umar