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All Journal Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam (JURRIMIPA)
Yahdi Bin Rus
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Mathematics

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Sintesis One-Pot Komposit Reduced Graphene Oxide/Polipirrol (rGO/PPy) pada Substrat Stainless Steel Fleksibel sebagai Elektroda Superkapasitor Nur Hayati; Nina Aprilini; Pratiwi Sanggusti; Rahmat Hidayat; Hidayat Hidayat; Maria Ulfa; Yahdi Bin Rus
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 5 No. 2 (2026): Agustus : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v5i2.9755

Abstract

The development of portable, wearable, and flexible electronic devices has increased the demand for energy storage systems with high electrochemical performance, long cycle life, and good mechanical flexibility. In this study, a reduced graphene oxide/polypyrrole (rGO/PPy) composite electrode was successfully synthesized on a flexible stainlesssteel substrate using a one-pot electropolymerization method for flexible supercapacitor applications. The rGO electrode was first prepared by the doctor blade technique and subsequently modified through the electropolymerization of 5 mM pyrrole using Cyclic Voltammetry (CV). The electrochemical performance of the synthesized electrodes was evaluated through Cyclic Voltammetry, capacitance measurements, cycling stability tests for up to 1000 cycles, and bending tests to assess their mechanical flexibility. The results showed that the incorporation of PPy significantly enhanced the electrochemical response and increased the capacitance of the electrode compared with pristine rGO, indicating the additional contribution of pseudocapacitive charge storage. However, during the cycling stability test, the rGO electrode exhibited higher capacitance retention after 1000 cycles than the rGO/PPy electrode, suggesting that the PPy layer experienced gradual structural degradation during repeated charge–discharge processes. Despite this decrease in cycling stability, the bending test demonstrated that the rGO/PPy electrode maintained good structural integrity without visible cracking or delamination after mechanical deformation. These findings indicate that the one-pot electropolymerization method successfully produced an rGO/PPy composite electrode with improved electrochemical performance and good mechanical flexibility, demonstrating its potential as an electrode material for flexible supercapacitor applications.
Pengaruh Elektrodeposisi Nanopartikel Perak pada Elektroda Reduced Graphene Oxide terhadap Stabilitas Superkapasitor Pratiwi Sanggusti; Nur hayati; Nina Aprilini; Rahmat Hidayat; Harman Amir; Hidayat Hidayat; Maria Ulfa; Yahdi Bin Rus
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 5 No. 2 (2026): Agustus : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v5i2.9756

Abstract

Supercapacitors have attracted considerable attention as energy storage devices owing to their high power density, rapid charge–discharge capability, and long cycle life. However, the electrochemical performance of reduced graphene oxide (rGO) is limited by the restacking phenomenon, which decreases the active surface area and restricts electrolyte ion diffusion. This study investigates the effect of silver (Ag) nanoparticle deposition on the stability of rGO electrodes using an electrodeposition method. Ag nanoparticles were deposited from a 5 mM AgNO₃ solution and the resulting electrodes were characterized by Scanning Electron Microscopy (SEM). Their electrochemical performance was evaluated using Cyclic Voltammetry (CV) and cycling stability tests up to 1,000 cycles. SEM analysis confirmed the successful and relatively homogeneous distribution of Ag nanoparticles on the rGO surface. The electrochemical results showed that the rGO/Ag electrode retained approximately 96–97% of its initial capacitance after 1,000 cycles, whereas the pristine rGO electrode retained only about 69%. These findings demonstrate that Ag deposition effectively enhances the structural stability and electrochemical performance of rGO electrodes, indicating their potential for high-performance supercapacitor applications.
Pengaruh Modifikasi Polianilin terhadap Kinerja Elektrokimia Elektroda Reduced Graphene Oxide untuk Superkapasitor Nina Aprilini; Nur Hayati; Pratiwi Sanggusti; Rahmat Hidayat; Yahdi Bin Rus
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 5 No. 2 (2026): Agustus : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v5i2.9758

Abstract

Supercapacitors have attracted considerable attention as energy storage devices due to their high power density, rapid charge-discharge capability, and long cycle life. However, the relatively low capacitance of reduced graphene oxide (rGO) limits its electrochemical performance when used as a single electrode material. This study aimed to investigate the effect of polyaniline (PANI) deposition on rGO electrodes through an electrochemical deposition method using a 5 mM aniline solution. The rGO electrode was first prepared on a stainless-steel substrate, followed by PANI deposition using cyclic voltammetry within a potential window of −0.4 to +0.4 V at a scan rate of 100 mV s⁻¹ for 10 cycles. The electrochemical performance of the fabricated electrodes was evaluated by cyclic voltammetry and cycling stability tests up to 1000 cycles. The cyclic voltammogram of the rGO/PANI electrode maintained a quasi-rectangular profile, indicating that the electrochemical deposition process produced an active electrode capable of charge storage. The specific capacitance of the rGO/PANI electrode reached 308.87 F g⁻¹, which was higher than that of pristine rGO at 240.88 F g⁻¹. Furthermore, the rGO/PANI electrode retained 67% of its initial capacitance after 1000 cycles, whereas pristine rGO retained only 49%. These results indicate that the incorporation of PANI improved both the specific capacitance and cycling stability of the electrode. The findings demonstrate that electrochemically deposited PANI is a promising approach for enhancing the electrochemical performance of rGO-based supercapacitor electrodes.
Peningkatan Efisiensi Sel Surya Perovskite melalui Optimasi Rasio Komposisi rGO dan Polimer Co-Additive Rahma Yuniza Putri; Rahmat Hidayat; Yahdi Bin Rus; Maria Ulfa
JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM Vol. 5 No. 2 (2026): Agustus : JURRIMIPA: Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurrimipa.v5i2.9814

Abstract

This research investigates the optimization of perovskite solar cells (PSCs) based on  by engineering the active layer interface using a binary composite of Reduced Graphene Oxide (rGO) and Polyethylene Glycol (PEG) polymer co-additive. The background of this study addresses the low long-term stability and high charge recombination challenges in PSCs despite their high potential as a next-generation photovoltaic technology. The fabrication method involved sequential solution deposition steps on Fluorine-doped Tin Oxide (FTO) substrates, with rGO:PEG weight ratios varied at 2:1, 1:1, and 1:2. Photovoltaic testing under a sun simulator revealed that interface modification significantly boosts efficiency compared to the pristine control device. The experimental findings demonstrate that the balanced ratio of rGO:PEG (1:1) achieves the peak Power Conversion Efficiency (PCE) of 5.43%, driven by a massive surge in short-circuit current density () to 9.78 . This study implies that precision stoichiometric control of rGO-polymer co-additives provides a powerful synergistic strategy to enhance charge extraction and maximize the performance of inorganic perovskite solar cells.
Co-Authors Harman Amir Hidayat Hidayat Maria Ulfa Nina Aprilini Nur Hayati Pratiwi Sanggusti Rahma Yuniza Putri Rahmat Hidayat