Article Per Year (5 Year)
p-Index From 2021 - 2026
0.408
P-Index
This Author published in this journals
All Journal Environmental and Materials Journal of Innovation Materials, Energy, and Sustainable Engineering
Nugraha Ramadhan
Department of Physics, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Surabaya, East Java 60111
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Electrochemical performance of Na2MnPO4F/C cathode synthesized through a solid-state method with variation of carbon concentration between citric acid and coconut shell charcoal Nugraha Ramadhan
Journal of Innovation Materials, Energy, and Sustainable Engineering Vol. 4 No. 1: (July) 2026
Publisher : Institute for Advanced Science Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/jimese.v4i1.2026.2692

Abstract

Background: The increasing demand for sustainable and low-cost energy storage systems has encouraged the development of sodium-ion batteries as an alternative to lithium-ion batteries. However, the low electronic conductivity and slow Na⁺ diffusion kinetics of Na₂MnPO₄F remain major limitations for its cathode performance. Methods: In this study, Na₂MnPO₄F/C cathode materials were synthesized using a solid-state method with carbon coating derived from citric acid and coconut shell charcoal at concentrations of 0, 3, 5, and 7 wt.%. Findings: Structural characterization confirmed the successful formation of the Na₂MnPO₄F phase, where citric acid at 7 wt.% produced the highest phase purity (99.9%), while coconut shell charcoal achieved the highest purity at 3 wt.% (90.066%). SEM-EDX analysis revealed that increasing carbon concentration influenced particle morphology, elemental distribution, and surface porosity, while FTIR analysis confirmed the presence of Mn–O, PO₄, and C–C bonding within the composites. Electrochemical characterization using EIS demonstrated that carbon coating significantly improved charge-transfer behavior, with the 7 wt.% citric acid sample exhibiting the lowest resistance and the best electron transport capability. Conclusion: These findings indicate that carbon coating, particularly using citric acid, effectively enhances the structural stability and electrochemical performance of Na₂MnPO₄F cathodes, highlighting its potential for sustainable sodium-ion battery applications. Novelty/Originality oh this article: The use of carbon coating derived from citric acid and coconut shell charcoal at concentrations of 0, 3, 5, and 7 wt.% on Na₂MnPO₄F/C cathode materials successfully improved charge-transfer behavior, structural stability, and electron transport capability, particularly in the 7 wt.% citric acid sample which exhibited the lowest resistance and the best electron transport capability.
Utilization of water hyacinth as a reducing agent in microwave-assisted synthesis of zinc oxide nanoparticles for photocatalytic applications Nugraha Ramadhan; Nathania Safitri Indar Permana; Achmad Bagas Fadillah; Andre Susanto; Muhammad Aulia Rahman Sulaiman
Environmental and Materials Vol. 4 No. 1: (June) 2026
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v4i1.2026.2771

Abstract

Background: The textile industry is the second largest contributor to industrial pollution worldwide, accounting for about 10% of carbon emissions and 20% of wastewater, mainly from textile dyeing. One of the most widely used dyes is methylene blue, a thiazine-based cationic aromatic dye that threatens aquatic ecosystems and human health. Conventional wastewater treatments are less effective in Indonesia due to high operational costs. Photodegradation using semiconductor photocatalysts offers a simple and affordable alternative. Zinc oxide nanoparticles provide advantages over titanium dioxide, including lower cost and excellent electrical, mechanical, and optical properties. This study aims to synthesize zinc oxide nanoparticles using water hyacinth leaf extract as a natural reducing agent, combined with microwave irradiation to enhance eco-friendly synthesis. Methods: The extract was applied at concentrations of 4%, 8%, and 12%. Characterization using X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy confirmed the formation of zinc oxide nanoparticles. Findings: The nanoparticles displayed average particle sizes of 134.42 nm, 120.54 nm, and 102.64 nm, respectively. Photodegradation performance analyzed by ultraviolet–visible spectrophotometry showed that methylene blue, with maximum absorbance at 664 nm, exhibited significant absorbance reduction after exposure to the nanoparticles, confirming their photocatalytic activity. Conclusion: Water hyacinth-assisted microwave synthesis produces zinc oxide nanoparticles efficiently, offering a low-cost and environmentally friendly solution with strong potential for textile dye wastewater treatment. Novelty/Originality of this article: The originality of this research lies in integrating water hyacinth extract and microwave irradiation, which accelerates nanoparticle synthesis while promoting sustainability, making it particularly suitable for application in developing countries.
Co-Authors Achmad Bagas Fadillah Andre Susanto Muhammad Aulia Rahman Sulaiman Nathania Safitri Indar Permana