Judul: The Performance of Dye Sensitized Solar Cell (DSSC) with Mangosteen Rind Extract and Papaya Leaf Extract Natural Dye Mixture
Abstrak: Pewarna alami secara umum memiliki rentang absorpsi cahaya yang lebih sempit dari pewarna sintetis, sehingga efisiensi konversi energi dye sensitized solar cell (DSSC) yang dihasilkan lebih kecil. Pencampuran pewarna memiliki potensi untuk memperluas area absorpsi cahaya. Penelitian ini bertujuan menganalisis kinerja DSSC berbahan dasar pewarna alami campuran ekstrak kulit manggis dan daun pepaya. Pewarna dipreparasi dengan metode maserasi dan diperoleh tiga jenis pewarna, yaitu ekstrak kulit manggis, ekstrak daun pepaya, dan campuran keduanya dengan tiga rasio volume berbeda. Elektrode kerja merupakan kaca indium tin oxide (ITO) dengan semikonduktor TiO2 yang direndam dalam pewarna. Elektrode lawan adalah kaca ITO yang dilapisi grafit. Elektrolit polimer dipreparasi dengan mencampurkan larutan elektrolit iodida/triiodida dengan polistirena tersulfonasi. Pencampuran pewarna terbukti dapat meningkatkan efisiensi konversi energi DSSC. Pewarna campuran ekstrak kulit manggis dan daun pepaya dengan rasio 3:1 memberikan efisiensi konversi energi terbesar, yaitu 1,97%., Most natural dyes have narrower light absorption wavelength ranges than synthetic dyes, resulting in dye sensitized solar cells (DSSC) with lower energy conversion efficiency. Mixing natural dyes can widen the light absorption area. This research aims to analyze the performance of DSSCs with mixed natural dyes of mangosteen rind extract and papaya leaf extract. The dye was prepared by maceration. Three varieties of dyes were obtained, which are mangosteen rind extract, papaya leaf extract, and the mixture of both in three different volume ratios. The working electrode is an ITO glass with TiO2 semiconductor, immersed in dye. The counter electrode is an ITO glass with a thin graphite layer. Polymer electrolyte was prepared by mixing an iodide/triiodide electrolyte solution with sulfonated polystyrene. Mixing of dyes is proven to be able to increase the energy conversion efficiency of DSSC. Mixed dye of mangosteen rind extract and papaya leaf extract with 3:1 volume ratio yielded the highest energy conversion efficiency of 1,97%.
Keyword: DSSC, mangosteen rind, mixed dye, papaya leaf, sulfonated polystyrene

Judul: Performance of Dye Sensitized Solar Cell Based on Sulfonated Polystyrene and Natural Dye Butterfly Pea Flower
Abstrak: Dye Sensitized Solar Cell (DSSC) adalah seperangkat sel surya yang berbasis fotoelektrokomia yang melibatkan transfer muatan listrik dari suatu fase ke fase lain Pewarna yang digunakan pada penelitian ini adalah sari alami bunga telang yang didapatkan dari proses tanpa maserasi. DSSC terdiri atas elektrode kerja, pewarna, dan elektrode lawan. Larutan elektrolit yang umum digunakan adalah I- /I3 - namun elektrolit ini mempunyai kelemahan mudah menguap sehingga dapat menurunkan nilai efisiensi DSSC. Penelitian ini bertujuan mengetahui penggunaan sari alami bunga telang sebagai zat warna pada sistem DSSC, pengaruh penambahan polistirena tersulfonasi disebabkan potensinya sebagai elektrolit DSSC dengan dua perlakuan berbeda yaitu pencampuran dan perendaman pewarna terhadap TiO2 yang memengaruhi nilai efisiensi kinerja DSSC. Nilai efisiensi DSSC dengan perlakuan pencampuran dan penambahan PSS menghasilkan efisiensi tertinggi sebesar 1,56%. Teknik pewarnaan terhadap PSS melalui proses pencampuran memperoleh efisiensi kinerja lebih baik dibandingkan dengan proses perendaman., Dye Sensitized Solar Cell (DSSC) is a set of solar cells based on photoelectrochemistry which involves the transfer of electrical charge from one phase to another. The dye used in this research is the natural essence of butterfly pea flowers obtained from a process without maceration. DSSC consists of a working electrode, dye, and counter electrode. The electrolyte solution that is commonly used is I- /I3 - , but this electrolyte has the weakness of being volatile so that it can reduce the efficiency value DSSC. This study aims to determine the use of natural butterfly pea flower as dyes in the DSSC system, the effect of adding sulfonated polystyrene due to its potential as a DSSC electrolyte with two different treatments, namely mixing and soaking dyes against TiO2 which affects the efficiency value of DSSC performance. The efficiency value of DSSC with PSS mixing and addition treatment resulted in the highest efficiency of 1.56%. The staining technique for PSS through the mixing process obtained better performance efficiency compared to the soaking process.
Keyword: bunga telang, DSSC, efisiensi, polistirena tersulfonasi

Judul: The Control and Eradication of Brucellosis in Cattle from the Standpoint of Human Health
Abstrak: Brucella abotus occurs boyh in man and cattle. The oragnism may trhrive wherever cattle re raised by man for breeding purpose. As such, spread to humans can easily be lessened if the diases is properly cotrolled an/or eradicated in cattle.
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