Sintesis Dan Karakterisasi Kompleks Brazilin dari Ekstrak Kayu Secang (Caesalpinia sappan Linn) Serta Aplikasinya dalam Dye Sensitized Solar Cells (DSSC)

Abstract

Secang (Caesalpinia sappan Linn) merupakan tanaman endemik Kalimantan Barat yang mengandung pigmen berwarna merah brazilin. Dalam penelitian ini, brazilin diperoleh melalui proses maserasi dilanjutkan dengan partisi cair-cair, selanjutnya dikomplekskan dengan ion logam Cu, Mg, dan Zn untuk meningkatkan kinerjanya ketika digunakan sebagai sensitizer pada dye sensitized solar cell (DSSC). Pengompleksan dilakukan menggunakan media gliserol-air, sedangkan fabrikasi DSSC dilakukan menggunakan metode doctor blading. Hasil analisis FTIR terhadap ekstrak kayu secang menunjukkan adanya gugus fungsi O-H, C=O, C=C, dan C-H, yang merupakan gugus fungsional khas dari brazilin. Terbentuknya kompleks brazilin-Cu, brazilin-Mg, dan brazilin-Zn ditandai dengan menurunnya intensitas puncak dari C=O pada 1606 cm-1 dan –OH pada 3263 cm-1. Hasil analisis UV-Vis menunjukkan bahwa kompleks memiliki rentang panjang gelombang lebih lebar dan cenderung batokromik. DSSC yang menggunakan kompleks brazilin-Cu, brazilin-Mg, dan brazilin-Zn menghasilkan rendemen konversi energi maksimum pada 200 W/m2, berturut-turut sebesar 0.034 %, 0.030 %, dan 0.013 %, serta DSSC ekstrak kayu secang murni sebesar 0.029 %. Dengan demikian, penggunaan sensitizer berbasis kompleks logam-brazilin dapat meningkatkan efisiensi DSSC. Kata kunci: Brazilin, DSSC, fotosensitizer, kayu secang, kompleks. Secang (Caesalpinia sappan Linn) is an endemic plant in West Kalimantan that contains Brazilin red pigments. In this study, brazilin was obtained through a maceration process carried out by a liquid-liquid partition, then complexed with metal ions to improve the performance of compilation used as a sensitizer on dye-sensitized solar cell (DSSC). Complexation is carried out using glycerol-water media, while DSSC fabrication is carried out using the doctor blading method. The results of FTIR analysis of secang wood extract showed the presence of a functional group O-H, C=O, C=C, and C-H, which are typical functional groups of brazilin. The formation of the brazilin-Cu, brazilin-Mg, and brazilin-Zn complexes is characterized by an increase in peak intensity of C=O at 1606 cm-1 and O-H at 3263 cm-1. The results of the UV-Vis analysis show that the complex has a wider wavelength and uses batochromic. DSSCs that use the brazilin-Cu, brazilin-Mg, and brazilin-Zn complexes that complement each other produce efficiencies of 0.034%, 0.030%, and 0.013%, and DSSC pure secang wood extract of 0.029%. The efficiency of the brazilian metal-complex when compared with brazilin, the efficiency increases, so that the maximum efficiency obtained by the Cu-brazilin sensitizer is equal to 0.034%. Keywords: Brazilin, DSSC, photosensitizer, secang wood, complex.

Characterization of Poly(vinylidene Fluoride) Nanofiber-Based Electrolyte and Its Application to Dye-Sensitized Solar Cell with Natural Dyes

“…Telang flower produced the highest efficiency, with 1.69% for liquid electrolyte, 1.6% for PVDF NF polymer electrolyte, and 1.23% for PVDF polymer electrolyte. The overall efficiency value is much higher compared to the DSSC system based on a braziline photosensitizer and liquid electrolyte with the highest efficiency of 0.034% published by Zulenda et al, a chlorophyll photosensitizer from pandan leaf extract and liquid electrolyte with an efficiency of 0.1% published by Al Alwani et al, a chlorophyll photosensitizer from spinach leaf extract and liquid electrolyte with an efficiency of 0.398% published by Kabir et al [2,[5][6]. High efficiency is generally determined by the pigment content and band gap value.…”

“…Energy, especially electrical energy, is one of the main drivers of a country [1][2]. Despite being one of the main needs of the community, the availability of electrical energy still depends on petroleum, natural gas, and various sources of fossil fuels which are getting depleted [3].…”

Contribution of extractives to the bark color of Caesalpinia sappan

“…The polar extracts of sappan wood (Caesalpinia sappan) bark might also contain brazilin, a major compound isolated and identified from its heartwood which has been known to be a precursor to the red colored dye compound from sappan wood (Caesalpinia sappan) (Rosanti et al 2023). A previous research by Zulenda et al (2018) showed that brazilin had an absorbance at 435 nm, but the presence of complexes such as metals could resulted in bathochromic shift, whereby its light absorbance shifted into longer wavelength.…”