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

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Journal : Unesa Journal of Chemistry

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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
Co-Authors Elma Alfianti Indri Lestari Rohman, Mohammad Chabibur Rosyiidah, Nur Anisa