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All Journal Science and Technology Indonesia Jurnal Pijar MIPA Unesa Journal of Chemistry
Pirim Setiarso
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology Mathematics Physics

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STUDI ELEKTROKIMIA EKSTRAK BETALAIN UMBI BIT SEBAGAI PEWARNA ALAMI DSSC (DYE SENSITIZED SOLAR CELL) Elma Alfianti Indri Lestari; Pirim Setiarso
Unesa Journal of Chemistry Vol 10 No 3 (2021)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1602.154 KB) | DOI: 10.26740/ujc.v10n3.p318-325

Abstract

This research was conducted to explore and utilize fresh beetroot as raw material for natural dyes in DSSC. DSSC (Dye Sensitized Solar Cell) is a photovoltaic cell that can convert sunlight into electricity using environmentally friendly raw materials and low production costs. In this study, DSSC was made using the doctor blade method using natural dyes derived from betalain tuber extract. beet. Natural dyes were chosen because they are easy to obtain, as well as cheap and environmentally friendly. The betalain from the beetroot is macerated with ethanol as a solvent. Characterization of natural dyes was carried out using UV-Visible spectrophotometry to determine the wavelength absorption, electrochemical characterization of dyes was carried out using cyclic voltammetry, and to determine the efficiency of the DSSC was carried out by I – V characterization. In this study, an absorption wavelength of 534 nm was produced which showed the uptake of the pigment betasianin. The electrochemical characterization showed that the energy of the HOMO (Highest Occupied Molecular Orbital) in the dye was -5.00 eV. The LUMO (Lowest Unoccupied Molecular Orbital) energy in dye is -3.71 eV. Analysis of the energy bandgap (energy gap) of the dye yields 1.29 eV, meaning that the prepared dye can be used as a sensitizer on the DSSC. I-V characterization showed that the efficiency value of DSSC with natural dye for beetroot was 0.004%. These results indicate that the natural dye extract of beetroot betalain can be used as a natural dye in DSSC. Key words: betalain,DSSC,electrochemical
Optimasi Respon Elektrokimia Gliserol Berbagai Tingkat pH Studi Voltametri Siklik Dengan Elektroda Kerja Amalgam (Cu/Hg) Rohman, Mohammad Chabibur; Pirim Setiarso
Unesa Journal of Chemistry Vol. 13 No. 3 (2024): Vol 13 No 3 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v13n3.p89-94

Abstract

Effect of pH on glycerol measurement using Cu/Hg amalgam working electrode by cyclic voltammetry method. The Cu/Hg amalgam electrode was chosen for its good conductivity and ease of surface cleaning, which prevents passivation due to compound buildup on the surface. In this study, the working electrode, comparison electrode, and auxiliary electrode were dipped into a glycerol solution with a pH variation between 5 and 8. The results show that the optimum pH for glycerol measurement is pH 7, with the highest reduction current response of -0.0142 A, indicating optimal glycerol ionization conditions. The decrease in current response above pH 7 is due to the interaction of glycerol with phosphate buffer which shifts the reaction equilibrium towards the formation of a by-product, hydroxypropenal. Therefore, the Cu/Hg amalgam electrode is effectively used as a working electrode for glycerol analysis, with the optimum pH at 7 for maximum results
Electrochemical analysis of butylated hydroxytoluene Rosyiidah, Nur Anisa; Pirim Setiarso
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5858

Abstract

Electrochemical analysis has carried out butylated hydroxytoluene (BHT) measurements. Cyclic voltammetry is used in this research as a qualitative-quantitative analysis of oxidation and reduction reaction processes, adsorption processes on electrode surfaces, and chemical electron transfer mechanisms.  This research aims to determine the optimum deposition time and scan rate in cyclic voltammetry, the BHT standard equation, the limit of detection, and the recovery percentage.  In this research, a deposition time of 25 seconds produces the highest current response of 3.89672 x 10-4 Ampere.  The scan rate is 150 mV/second, producing the highest and optimum current response of 4.24561 x 10-4 Ampere.  BHT standard equation y = (4.92784 x 10-6) x + (1.25207 x 10-4) is obtained with R2 = 0.99933. The limit of detection value is 2.69683 ppm, and the recovery percentage is 101.314%.  Therefore, this cyclic voltammetry method is suitable for analyzing BHT because it has high sensitivity.
Effect of pH on Brazilin Extraction from Sappanwood (Caesalpinia sappan L.) and Its Impact on the Efficiency of Natural Dye-Sensitized Solar Cells (DSSCs) Al Hafidl, Achmad Naufal; Nita Kusumawati; Pirim Setiarso; Samik, Samik; Maria Monica Sianita Basukiwardojo; Khofifatul Rahmawati
Science and Technology Indonesia Vol. 11 No. 2 (2026): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2026.11.2.378-388

Abstract

Dye-sensitized solar cells (DSSCs) are a sustainable photovoltaic technology for addressing the global energy crisis through the conversion of solar energy using photosensitive dyes. This study aims to investigate the effect of pH variation during extraction on the optical, electrochemical, and photovoltaic characteristics of brazilin dye from sappanwood (Caesalpinia sappan L.) for DSSC applications. Brazilian extraction was performed using Microwave-Assisted Extraction (MAE) with pH conditioning from 2 to 12. UV-Vis spectroscopy showed an increase in light absorbance at 400–800 nm. The pH 8 dye exhibited a maximum absorption peak at 444.59 nm due to the formation of a quinoidal base through partial deprotonation of the hydroxyl (-OH) group. FTIR characterization confirmed the chemical structure of the dye with characteristic absorption spectra of broad bands at 3000–3500 cm-1 for the phenolic hydroxyl group and peaks at 2800–3000 cm-1 for aromatic C-H stretching vibrations, as well as aromatic C=C and C=O stretching vibrations at 1600–1400 cm-1. Energy band gap analysis revealed that the dye at pH 2–12 has an energy gap range of 0.1788–0.5355 eV. Optimizing the extraction pH revealed that pH 8 yields the most effective dye performance, resulting in a peak DSSC efficiency of 2.17%, a minimal charge transfer resistance of 100 Ω, and the narrowest energy bandgap at 0.1788 eV. Weakly basic conditions enhance dye molecule conjugation, strengthen bonding with TiO2, and optimize the overall charge transfer process. The research findings confirm the potential of optimizing natural dye extraction conditions as a strategy to enhance DSSC efficiency in a sustainable and environmentally friendly manner.
Co-Authors Al Hafidl, Achmad Naufal Elma Alfianti Indri Lestari Khofifatul Rahmawati Maria Monica Sianita Basukiwardojo Nita Kusumawati Rohman, Mohammad Chabibur Rosyiidah, Nur Anisa Samik Samik