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All Journal Journal of Fibers and Polymer Composites International Journal of Renewable Energy Development
Wismalqi, Wismalqi
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Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Enhancement of Aluminum-Air Battery Performance Using Rice Husk-Derived Carbon Quantum Dots and Carbon Nanotubes Zakky, Muhammad Ammar; Ridwan, Firman; Agusto, Dean Bilalwa; Wismalqi, Wismalqi; Gusriwandi, Gusriwandi
Journal of Fibers and Polymer Composites Vol. 4 No. 2 (2025): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v4i2.403

Abstract

The development of sustainable, high-performance energy storage systems is crucial for addressing the challenges associated with renewable energy integration and the limitations of conventional lithium-ion batteries. This study investigated the potential of an innovative electrolyte membrane for aluminum-air batteries, incorporating carbon quantum dots (CQDs) derived from rice husk charcoal and carbon nanotubes (CNTs) within a polyvinyl alcohol (PVA) matrix. CQDs were synthesized using a microwave-assisted technique, and CNTs were added to enhance the structural and conductive properties of the membranes. Three distinct membrane compositions were prepared: a base solution of PVA, HCl, and glycerol; a base solution with CQDs; and a base solution with CQDs and CNTs. Fourier Transform-Infrared (FT-IR) spectroscopy revealed enhanced intermolecular interactions and successful integration of the carbon nanomaterials within the polymer network. X-ray diffraction (XRD) analysis indicated a reduction in crystallite size from 11.27 nm (base membrane) to 9.65 nm (–14.36%) with CQDs and further to 8.29 nm (–26.47%) with CQDs + CNTs, suggesting improved amorphous characteristics that reinforce the membrane structure and facilitate ionic conductivity. Electrochemical impedance spectroscopy (EIS) demonstrated an increase in ionic conductivity from 4.98501 mS/cm (base membrane) to 5.51837 mS/cm with CQDs and 6.35292 mS/cm (+27.4%) with CQDs + CNTs. These findings highlight the synergistic effect of CQDs and CNTs in optimizing the ion migration pathways and charge transport within the electrolyte membrane. The utilization of rice husk charcoal as a precursor for CQDs aligns with sustainable practices and promotes the use of renewable resources. This study presents a promising approach for the development of advanced electrolyte membranes for aluminum-air batteries, contributing to efficient, environmentally friendly, and cost-effective energy storage solutions.
Electrospun PVA/CQD nanofiber–coated carbon anode for high–performance microbial fuel cells: A comparative study Ridwan, Firman; Raimon, Muhammad Restu; Agusto, Dean Bilalwa; Wismalqi, Wismalqi; Alamsjah, Feskaharny
International Journal of Renewable Energy Development Vol 15, No 4 (2026): July 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61677

Abstract

This study details the development of a high-performance microbial fuel cell (MFC) utilizing a nanofiber-coated carbon anode, fabricated through the electrospinning of polyvinyl alcohol (PVA) integrated with carbon quantum dots (CQDs). A dual-chamber H-type MFC, with a working volume of 50 mL for both anode and cathode compartments, was operated in batch mode using sterilized sugarcane juice, adjusted to a pH of 7.0, as the organic substrate. Two electrogenic bacteria, Bacillus subtilis and Escherichia coli, were separately immobilized within the PVA/CQD nanofiber matrix to assess their electrochemical performance. Structural and chemical characterizations using SEM, FTIR, and UV–Vis spectroscopy confirmed the successful incorporation of CQDs and effective bacterial colonization within the nanofiber network. Electrochemical studies, such as CV and EIS, indicated low charge transfer resistance and improved electron kinetics especially when B. subtilis was present and an Rct of about 400 ohms. MFCs based on B. subtilis reached a maximum power density of 1754 mW/m² on day four of operation at a fixed external resistance of 100 0 and the electrode surface area of 9.45 cm², about 3.5 times greater than the power density obtained with E. coli (491 mW/m²). This has been due to the high performance of B. subtilis which can form a robust conductive biofilm, releases endogenous redox mediators, and has the ability to metabolize sugar rich substrates efficiently. These findings underscore the potential of PVA/CQD nanofiber-coated carbon anodes as an effective strategy for enhancing MFC performance and provide a promising foundation for future optimization and scale-up toward sustainable energy generation from organic waste at the laboratory level.
Co-Authors Agusto, Dean Bilalwa Feskaharny Alamsjah Firman Ridwan Gusriwandi Gusriwandi Raimon, Muhammad Restu Zakky, Muhammad Ammar