Awitdrus Awitdrus, Awitdrus
Kampus Bina Widya KM. 12,5 Panam Pekanbaru 28293, Riau, Indonesia

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PERFORMA SEL SUPERKAPASITOR DENGAN MENGGUNAKAN PENGUMPUL ARUS STAINLESS STEEL-NANOPARTIKEL PLATINUM Farma, Rakhmawati; Deraman, Mohamad; Awitdrus, Awitdrus
SEMIRATA 2015 Prosiding Bidang Fisika
Publisher : SEMIRATA 2015

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Performa sel superkapasitor sangat ditentukan oleh tiga faktor utama yaitu elektrolit,  pengumpul arus dan elektroda. Elektroda karbon aktif yang disediakan dari pra- karbonisasi serabut tandan kosong kelapa sawit dengan perlakuan KOH. Karbonisasi elektroda dilakukan pada suhu 800oC menggunakan profil pemanasan multi-langkah dalam lingkungan gas N2 dan pengaktifan CO2 dilakukan pada suhu 800oC selama 3 jam. Larutan 1 M H2SO4 digunakan sebagai larutan elektrolit. Steinless Steel 316L yang telah ditumbuhkan nanopartikel platinum di atasnya digunakan sebagai pengumpul arus. Penumbuhan nanopartikel platinum di atas pengumpul arus bertujuan untuk menghasilkan sifat listrik dan elektrokimia yang lebih baik. Evaluasi terhadap nanopartikel platinum di atas pengumpul arus dilakukan dengan difraksi sinar-X yang ditandai dengan kehadiran puncak platinum (111) dan analisis energi dispersif sinar-X dengan persentase atomik platinum 3.89 %. Nilai kapasitansi sel superkapasitor berdasarkan data spektroskopi impedansi elektrokimia sebelum dan setelah penumbuhan nanopartikel platinum masing-masing sebesar 104.87 F/g dan 114.67 F/g, dan nilai hambatan seri ekuivalen menurun dari 0.438 W menjadi 0.045 W. Katakunci: Superkapasitor, Spektroskopi impedansi elektrokimia, Kapasitansi spesifik, nanopartikel platinum
The Preliminary Study of Utilization of Water Chestnut as Supercapacitor Electrode Using Steam Activation Zulkifli, Zulkifli; Awitdrus, Awitdrus; Taer, Erman
Journal of Aceh Physics Society Volume 7 Number 1, January 2018
Publisher : Aceh Physics Society

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Purun tikus (eleocharis dulcis) merupakan tumbuhan gulma yang bersifat polutan di perairan tawar. Efek pertumbuhan purun tikus yang cepat menyebabkan pendangkalan perairan, gangguan sistem irigasi dan pengurangan oksigen bawah air. Salah satu upaya pemanfaatan purun tikus yang bernilai tambah tinggi adalah purun tikus sebagai elektroda karbon superkapasitor. Karbon aktif berasaskan purun tikus dibuat dengan metode dua langkah secara simultan yaitu karbonisasi pada suhu 600°C dalam lingkungan nitrogen dan aktivasi fisika menggunakan uap air pada suhu 900°C selama 1 jam. Densitas karbon aktif menurun dari 0,85 menjadi 0,78 gr/cm3 setelah diaktivasi. Sifat elektrokimia elektroda karbon diukur dengan metode siklik voltammetri. Kapasitansi spesifik elektroda karbon masing-masing 58, 33 dan 23 F/g pada laju imbasan 1, 2 dan 5 mV/s. Hasil penelitian ini menunjukkan bahwa purun tikus dapat dijadikan elektroda superkapasitor dan menjadi solusi untuk mengurangi kerusakan ekosistem perairan tawar. Water chestnut are polluted weed plant in fresh water. The effect of rapid growth of water chestnut causes siltation of water, irigation system disturbance and reduction of oxygen underwater. One of the effort of the value added utilization of water chestnut is as carbon electrode for supercapacitor application. Water chestnut based activated carbon is prepared by a two-step method simultaneously i.e. carbonization at 600°C in a nitrogen atmospheric and physical activation using steam at 900 °C for a hour. The density of activated carbon after activation is decreased from 0,85 to 0,78 gr/cm3. The electrochemical properties of the carbon electrode are measured using cyclic voltammetry method. The specific capacitance of carbon electrode are 59, 33 and 23 F/g at the scan rate of 1, 2 and 5 mV/s, respectively. The result of this study are indicated that water chestnut suitable for supercapacitor electrode and become a solution to reduce the freshwater ecosystem damage. Keywords: Purun tikus, superkapasitor, siklis voltammetri, kapasitansi spesifik, perairanREFERENCEAsikin, S. dan Thamrin, M. 2012. Manfaat Purun Tikus (Eleocharis Dulcis) Pada Ekosistem Sawah Rawa. Jurnal Litbang Pertanian, 31(1): 35-42Arepalli, S., Fireman, H., Huffman, C., Moloney, P., Nikolaev, P., Yowell, L., Higgins, C. D., Kim, K., Kohl, P. A., Turano, S. P. and Ready W. J. 2005. Carbon-nanotube-based electrochemical double-layer capacitor technologies for spaceflight applications. Journal of  The Minerals, Metals and Materials Society, 57:26-31.Erari, S.S., Mangimbulude, J., Lewerissa, K. 2012. Pencemaran Organik di Perairan Pesisir Pantai Teluk Youtefa Kota Jayapura, Papua. Prosiding Seminar Nasional Kimia Unesa. ISBN 978-979-028-550-7. (C): 327-340.Farma, R., Deraman, M., Awitdrus, A., Talib, I.A.  Taer, E., Basri, N.H., Manjunatha, J.G., Ishak, M.M., Dollah, B.N.M., Hashmi, S.A. 2013.  Preparation of highly porous binderless activated carbon electrodes from fibres of oil palm empty fruit bunches for application in supercapacitors. Bioresource Technology. 132:254–261Feng, C.W., R.L. Tseng., C.C. Hu., C.C Wang., 2015, Effects of pore structure and electrolyte on the capasitive characteristics of steam and KOH activated carbons for supercapasitors, Journal of power sources. 144:302-309.Ionnidou, A and Zabaniotu. 2007. Agricultural residues of precursors for activated carbon production–a review, Renewable and sustainable energy reviews. 11:1705-1966.Kurniawan, F., Wongso, M., Ayucitra, A., Soetaredjo F.E., Angkawijaya A. E., Ju,Y. H., Ismadji, S. 2014. Carbon microsphere from water hyacinth for supercapacitor electrode. Journal of the Taiwan Institute of Chemical Engineers. 47: 197-201.Liu, B., Zhou, X., Chen, H., Liu, Y., Li, H. 2016. Promising porous carbons derived from lotus seedpods with outstanding supercapacitance performance. Electrochimica Acta. 208 :55–63.Taer, E., Mustika, W.S., Zulkifli, Syam, I.D.M., Taslim, R. Pengaruh Suhu Pengaktivan CO2 Terhadap Luas Permukaan Elektroda Karbon dan Sifat Kapasitan Sel Superkapasitor dari Kayu Karet. 2015. Prosiding Seminar Nasional Fisika Universitas Andalas (SNFUA). 96-100Taer, E., Taslim, R., Aini, Z., Hartati, S.D., Mustika, W.S. 2017. Activated carbon electrode from banana-peel waste for supercapacitor applications. AIP Conference Proceedings. 1801:040004-1-040004-4.Taer, E., Zulkifli., Arif, E.N., Taslim, R. Analisa Kapasitansi Spesifik Elektroda Karbon Superkapasitor dari Kayu Karet Terhadap Laju Scan Berdasarkan Variasi Aktivasi HNO3. 2016. Spektra Jurnal Fisika dan Aplikasinya. 1(1): 35-40.Yu, M., Han, Y., Li, J., Wang, L., 2016. CO2-activated porous carbon derived from cattail biomass for removal of malachite green dye and application as supercapacitors. Chemical Engineering Journal. 17:1-41.
PEMBUATAN DAN KARAKTERISASI KARBON AKTIF DARI BAMBU BETUNG (DENDROCALAMUS ASPER) DENGAN AKTIVASI KOH BERBANTUAN GELOMBANG MIKRO Hutapea, Erin Mazelly; Iwantono, Iwantono; Farma, Rakhmawati; Saktioto, Saktioto; Awitdrus, Awitdrus
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

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Activated carbon had successfully been made from betung bamboo (Dendrocalamus Asper) bycarbonization process for 1 hour with chemical activation using pottasium hydroxide (KOH) with themass ratio of the carbon powder with KOH i.e. 1:0, 1:1, 1:2 and 2:1. In order to activate the carbon,the activation was help by microwave irradiation with the power of 630 Watt for 20 minutes. Thepurpose of this research is to characterize activated carbon using X-ray diffraction (XRD), FourirerTransform Infrared Spectroscopy (FTIR) and absorption of methylene blue. The data of X-raydiffraction pattern indicated that all of the activated carbon were in a semi-crystalline form, with theXRD peaks observed at angel of diffraction (2θ) of 21.268o and 41.014o with oriented of (002) and(100) respectively. The highest value of layer (Lc) is resulted from the ratio 1:1 as high as 21.495 nmand this data supported by the highestabsorption of methylene blue at ratio 1:1 as high as 99.327mg/g. Characterization of FTIR showed that the activated carbon had the function of cluster –OH, CHand C=C. Overall the calculated and analyzed results showed that the variation of KOHconcentration influences the qualities of the activated carbon.
EFEK WAKTU RENDAM AKTIVASI KIMIA BERBANTUAN GELOMBANG MIKRO TERHADAP SIFAT FISIKA KARBON AKTIF DARI KULIT BUAH JENGKOL (PITHECELOBIUM JIRINGA) Asra, Yurike; Iwantono, Iwantono; Saktioto, Saktioto; Farma, Rakhmawati; Awitdrus, Awitdrus
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

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Activated carbon based on jengkol fruit shell at soaking times assisted pottasium hydroxide (KOH)activation by microwave has successfully been made, the ratio of carbon mass to KOH of 2:1. Thechemical activation soaking time was varied at 24 hours, 36 hours, and 48 hours. The aims of thisresearch was to study the effect of soaking time on the physical properties of activated carbon ofjengkol shell that represented by micro structure, surface area, adsorption, and chain structure ofactivared carbon. The micro structure pattens of samples were in semi-crystralline structure as thepresence of quite narrow 2 peaks at 2θ : 22,994o and 42,102o representing the crystal orientation of(002) and (100). The highest of stack height (Lc) was produced from the sample with soaking times 24hours which was 1,773 nm, with surface area of 124,50 m2/g. The adsorption of methylen blue was ashigh as 99,569mg/g and chain stucture of activated carbon based on jengkol shell was obtainedfunction group of C-H, C-C, C=O, and C-O at wave number of 2943,43 cm-1, 2369,65 cm-1, 1612,56cm-1 and 1160,23 cm-,1 respectively.
PEMBUATAN DAN KARAKTERISASI KARBON AKTIF DARI SERABUT TANDAN KELAPA SAWIT SEBAGAI ADSORBEN DENGAN VARIASI AKTIVATOR KOH BERBANTUAN IRADIASI GELOMBANG MIKRO Farma, Rakhmawati; Wahyuni, Fitri; Awitdrus, Awitdrus
Komunikasi Fisika Indonesia Vol 14, No 1 (2017)
Publisher : Universitas Riau

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The aims of this study are to determine the influence of percentage of potassium hydroxide (KOH) and tothe adsorption of methylene blue of the activated carbon. Activated carbon was prepared from fibers ofempty fruit bunches of oil palm (fibers of EFB) pre-carbonized at 280℃ for 4 hours. Chemical activationwas conducted to the sample for 25 hours with weight percentage of KOH of 25%, 50%, and 75%, andsubsequently the sample was then irradiated by microwave with the out put power of 720 Watt for 15minutes. The highest methylene blue of 87,731 mg/g was obtained from sample with percentage of KOHof 75%. The higest stack height (Lc) of 2.897 nm was also resulted from the methylen blue. 
PENGARUH PENAMBAHAN MATERIAL PLASMONIK PERAK (Ag) TERHADAP SIFAT FISIS NANOROD ZnODENGAN METODE SEED-MEDIATED HYDROTHERMAL Anggelina, Fera; Iwantono, Iwantono; Umar, Lazuardi; Awitdrus, Awitdrus
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

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ZnOnanorods with addition of plasmonic materials of silver (Ag) have successfully been grown ontoFlourine Tin Oxide (FTO) substrates by using seed-mediated hydrothermal method though twosteps: seeding and growing processes. Ag was added to the ZnOnanorods after finishing theZnOnanorods growth process at a temperature of 90°C for 8 hours. Effect of Ag to the physicalproperties was evaluated by using the characterization techniques of X-Ray Diffraction (XRD),Field Emission Scanning Electron Microscopy (FESEM)-Energy Dispersive X-Ray (EDX), and UVVisspectroscopy. XRD pattern of the sample did not show special diffraction peak of Ag. FESEMphotograph confirmed that the Ag was substituted to the ZnOnanorods lattice. The presence of Ag inthe ZnOnanorodsaffected tobroken a part of the surface of ZnOnanorods, vary the diameter size ofthe ZnOnanorods and vertical orientation of ZnO array was not formed perfectly. In addition, thepresence of Ag in the ZnOnanorods was confirmed by EDX spectrum of sample that observed 0.2%of Ag-weight percentage. The addition of Ag to the ZnOnanorods positively affected to opticalproperties of ZnO, as absorption spectrum of sample become wider, ranked from UV to visible. Itwas concluded that addition of Ag to the ZnOnanorods active material of DSSC can increase theefficiency of the cell significantly.
EFEK VARIASI DAYA IRADIASI GELOMBANG MIKRO TERHADAP KARBON AKTIF TONGKOL JAGUNG UNTUK PENJERNIHAN AIR Fadillah, Raysa; Farma, Rakhmawati; Awitdrus, Awitdrus
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

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The power of microwave irradiation affect the quality of activated carbon. In this research the activated carbon has been made of biomass of corn cob by using carbonization process, chemical activation using potassium hydroxide as the activating agent and microwave irradiation power was variated for 360 watt, 450 watt, 630 watt, dan 720 watt in 15 minutes. The surface morphology of activated carbon for the sample KA720 produced lots of pores more than that of the sample KA360, KA450, and KA630. The sea water that has been mixed with activaed carbon using microwave irradiation power of 720 watt with temperatur of 26oC, and pH of 7,41. 
PENGARUH AKTIVASI KIMIA DENGAN BANTUAN IRADIASI GELOMBANG MIKRO TERHADAP SIFAT FISIS KARBON AKTIF DARI SEKAM PADI SEBAGAI ADSORBEN Kartikasari, Nurlisa; Farma, Rakhmawati; Awitdrus, Awitdrus
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

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The percentage of KOH affects the quality of activated carbon. In this research the activated carbon has been made of biomass from rice husk by using the process carbonization, chemical activation using Potassium Hydroxide variated percentage for 5%, 10%, 15% and 20% from the mass of sample and microwave irradiation power by 450 Watt. The surface morphology of activated carbon for the sample KA10 produced the even pores structure and lots of pores more than sample KA5, KA15 and KA20. The analysis results of surface morphology of activated also supported by analysis atomic adsorption spectroscopy (AAS) show that sample KA10 has the highest heavy metal adsorption 92,40% for Ni, 91,31% for Pb and 70,24% for Zn.  
Pengaktifan Kimia Berbantuan Gelombang Mikro Karbon Aktif dari Kulit Kacang dengan Waktu Pra-karbonisasi yang Berbeda Awitdrus, Awitdrus; Mulfida, Dewi; Farma, Rakhmawati; Saktioto, Saktioto; Iwantono, Iwantono
Jurnal Fisika Vol 8, No 2 (2018)
Publisher : Jurnal Fisika

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Karbon aktif berbahan dasar kulit kacang (Arachis hypogaea L) disintesis menggunakan metode pengaktifan kimia berbantuan gelombang mikro. Kulit kacang dipra-karbonisasi selama 2 jam, 3 jam dan 4 jam pada temperatur 200 oC. Pengaktifan kimia dilakukan menggunakan kalium hidroksida dengan rasio massa pra-karbonisasi dan kalium hidroksida adalah 2:1 selama 24 jam. Iradiasi gelombang mikro dilakukan pada daya keluaran 630 watt selama 20 menit. Sifat fisika karbon aktif dikarakterisasi menggunakan difraksi sinar-X untuk mengetahui struktur mikro, isoterma adsorpsi/desorpsi N2 untuk mengetahui parameter porositas, serta infra merah transformasi Fourier untuk mengetahui struktur rantai karbon aktif. Pola difraksi sinar-X menunjukkan bahwa semua karbon aktif memiliki struktur turbostratik yang ditandai dengan adanya puncak (002) dan (100). Luas permukaan dan volume pori karbon aktif tertinggi adalah 153 m2/g dan 0,064 cm3/g untuk karbon aktif dengan waktu pra-karbonisasi selama 2 jam. Struktur rantai karbon menunjukkan adanya  gugus fungsi P=O, C-O, C-C, C-H pada bilangan gelombang 1031 cm-1, 1609,67 cm-1, 2363,87 cm-1, dan 2867,31 cm-1.
MORFOLOGI DAN EFISIENSI SEL SURYA FOTOELEKTROKIMIA BERBASIS NANOSTRUKTUR ZnO DILAPISI TEMBAGA Iwantono, Iwantono; Natalia, Sella; Abdi, Rinaldo; Awitdrus, Awitdrus; Zulkarnain, Zulkarnain
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

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ZnO nanostructures coated Cu (Copper) have been successfully grown using a method of seed mediated hydrotermal. The growth of Cu coated ZnO nanostructures were used as an active material of DSSC. The Cu on ZnO nanostructures has been coated at a concentration of 10 mM at room temperature in 30 minutes. The samples were characterized using Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray (EDX). The FESEM images showed that the geometrical shape of ZnO nanostructures was nanoflower. Spectra of EDX showed Cu was really exist in all samplesof about 0.8%. A DSSC was fabricated by using the ZnO nanostructured coated Cu as an active material.The results of I-V measurements under iluminattion of halogen lamp its intensity of 100 mW/cm2 has produced efficiency 0.35% (DSSC without copper) and increasedto 0,43% whenCuwas coated on ZnO.