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All Journal Jurnal Spektra Journal of Aceh Physics Society Science and Technology Indonesia Juripol (Jurnal Institusi Politeknik Ganesha Medan) Community Development Journal: Jurnal Pengabdian Masyarakat Indonesia Berdaya Jurnal Pengabdian kepada Masyarakat Nusantara Journal of Technomaterial Physics Jurnal Natural Madani: Multidisciplinary Scientific Journal Jurnal Pengabdian Masyarakat Berdampak
Hariyati Lubis, Hariyati
Universitas Amir Hamzah
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Journal : journal of technomaterial physics

 1 
Analysis and Characterization of Fe3O4/Silica Composite from Rice Husk Ash Susilawati, Susilawati; Lubis, Hariyati; Yanti, Jeddah; Pardede, Syahrani Nabilla; Napitupulu, Agnes Federova
Journal of Technomaterial Physics Vol. 6 No. 1 (2024): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v6i1.15975

Abstract

In this investigation, Fe3O4/Silica composites were synthesized from rice husk ash utilizing the coprecipitation technique, aiming to elucidate the influence of variedheating temperatures on the surface morphology and elemental composition of the composites. Comprehensive characterizations were conducted employing FourierTransform Infrared (FTIR) Spectroscopy, X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). These analyses unveiled a heterogeneous distributionof Fe3O4 nanoparticles and affirmed the amorphous characteristic of the silica constituent, with the XRD results prominently displaying a broad peak at approximately 2θ = 38°, signifying the amorphous nature. Despite the alterations in heating temperatures, SEM observations indicated a negligible effect on the nanoparticles' surface morphology, whereas notable variations were discerned intheir elemental composition. The outcomes of this study provide insightful contributions to the understanding of the structural properties of Fe3O4/Silica composites, suggesting avenues for refining synthesis methodologies for enhanced environmental and technological utilization.
Comparative Analysis of Gasoline and Liquefied Petroleum Gas (LPG) on Motorcycle Engine Performance Yamin, Octo Muhammad; Nasution, Devi Maiya Sari; Noer, Zikri; Lubis, Hariyati; Sofie, Tengku Machdhalie
Journal of Technomaterial Physics Vol. 6 No. 2 (2024): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v6i2.18270

Abstract

This research aims to determine the efficiency of LPG fuel performance compared to gasoline in motorcycle engines. The research method involves a brake dynamometer test with engine speed variations of 2000 rpm, 2200 rpm, and 2500 rpm. Based on the results obtained, the exhaust gas temperature (°C) at an engine speed of 2000 rpm with gasoline is 148°C and 146°C, while with LPG, it is 107°C and 108°C. The fuel consumption rate (cc/min) at 2000 rpm is 15.8 cc/min, 16.2 cc/min with gasoline, and 9.36 cc/min with LPG. At 2200 rpm, the fuel consumption is 16.2 cc/min, 22.8 cc/min with gasoline, and 10.48 cc/min with LPG. At 2500 rpm, it is 20.2 cc/min, 19.4 cc/min with gasoline, and 14.40 cc/min with LPG. In terms of fuel consumption savings, using LPG as a fuel can significantly reduce fuel usage.
Cycle Voltametry Performance of Nitrogen-Doped Reduced Graphene Oxide Derived from Oil Palm Empty Fruit Bunch for Sodium-Ion Batteries Sihombing, Gunawan; Yamin, Octo Muhammad; Noer, Zikri; Lubis, Hariyati; Agus, Muhammad Abduh Akram; Idamayanti, Dewi
Journal of Technomaterial Physics Vol. 7 No. 1 (2025): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v7i1.18305

Abstract

This study investigates the electrochemical performance of nitrogen-doped reduced graphene oxide (NRGO) derived from oil palm empty fruit bunches as an anode material for sodium-ion batteries (SIB). The aim is to evaluate the potential of NRGO to enhance sodium-ion storage through cyclic voltammetry (CV) analysis. The NRGO was synthesized using a modified Hummers method followed by nitrogen doping through thermal treatment under an ammonia atmosphere. Cyclic voltammetry measurements were conducted at scan rates of 0.2 mV/s, 1 mV/s, and 10 mV/s to analyze the redox behavior and charge storage capacity. At a low scan rate of 0.2 mV/s, the current response was minimal, indicating limited sodium-ion intercalation. At 1 mV/s, the current increased, suggesting enhanced ionic mobility, though no distinct redox peaks were observed, implying a primarily capacitive mechanism. At the highest scan rate of 10 mV/s, the current response increased further, but the absence of clear redox peaks persisted, indicating limited faradaic reactions. The initial CV cycles showed a higher current due to the formation of a solid electrolyte interphase (SEI) layer and structural rearrangements, which stabilized in subsequent cycles. The overall charge storage mechanism appears to be dominated by double-layer capacitance rather than faradaic processes. These findings suggest that NRGO derived from oil palm empty fruit bunches exhibits moderate electrochemical performance as a SIB anode material. While the material demonstrates promising charge storage capabilities, further optimization is required to enhance redox activity. Future research should focus on improving synthesis conditions, such as increasing nitrogen doping levels and enhancing surface area, to achieve better electrochemical performance and make NRGO a viable candidate for sodium-ion battery applications.
Co-Authors Agung Imaduddin Agus, Muhammad Abduh Akram Awan Pelawi Batubara, Enika Diana Devi Maiya Sari Nasution Eddy Marlianto Efendi, Syahril Eidi Sihombing Eidi Sihombing Eidi Sihombing Gunawan Sihombing Hasibuan, Edi Sarman Herty Afrina Sianturi Hilda Ayu Marlina Idamayanti, Dewi Irma, Mutia Irpansyah Siregar Jeddah Yanti Lubis, Kurniawan Lubis, Renny Marhaposan Situmorang Martha Rianna Merpiseldin Nitsae Muhammad Zarlis Napitupulu, Agnes Federova Nasution, Devi Maiya Sari Noer, Zikri Pardede, Syahrani Nabilla Perdinan Sinuhaji Pius Sebleku Rafly Ihsan As Siddiq, Muhammad Rahmayati, Tengku Elfira Rika Permata Sari Siregar Rinaldi, Fajar Sari Nasution, Devi Maiya Sianturi, Josten Siregar, Irfansyah Susanti, Rika Deni Susilawati Susilawati, Susilawati Tengku Machdhalie Sofie Timbangen Sembiring Yamin, Octo Muhammad Yenni Ramadhani Harahap