', Sugianto
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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EFEK MODIFIKASI PERMUKAAN KARBON AKTIF MONOLIT TERHADAP SIFAT FISIS DAN ELEKTROKIMIA SEL SUPERKAPASITOR Yanti, Sri; Taer, Erman; ', Sugianto
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Surface modification of activated carbon monolith electrode   for  a  supercapacitor cell from rubber wood has successfully been made by two activation methods. Physical activation  was perfomed  using  CO2  gas  at a temperature of  800oC, and chemical  activation used  3  M  KOH  and  3  M  NaOH  as activation  agents. This study used two kinds  of activated agents, namely COK for KOH activated agent and CON for NaOH activated agent. Both  activation methods yielded different physical and electrochemical properties. The  physical properties  that were analyzed  were  density ,   surface  morphology,  and  BET  surface area,  whereas  the electrochemical properties were specific capacitance, specific energy,  and specific power.  N2  gas  isothermal  adsorption  showed  a BET  surface area  of  577.52  m2g-1 and  441.45  m2g-1. Meanwhile,  the electrochemical  properties obtained of sample were  the specific  capacitance  values  of  103.65  Fg-1 and  83.45  Fg-1for  CON  and COK, respectively . Based on all obtained data and their analysis, it was concluded that KOH   activators  resulted  the  electrochemical properties  better  compared tothose of  NaOH activators.
KARAKTERISASI BAHAN FEROELEKTRIK BARIUM STRONTIUM TITANAT (Ba0,7 Sr0,3TiO3) MENGGUNAKAN MIKROSKOP IMBASAN ELEKTRON (SEM) Rizki, Befriana Ayu; Dewi, Rahmi; ', Sugianto
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Ferroelectric  of Ba0,7Sr0,3TiO3  has been made  from  BaCO3  (Barium Carbonat), SrCO3(Strontium Carbonat),  and TiO2  (Titanat Oksida)  with variation  of  calcination temperatures  of  600oC, 700oC,  and 800oC.  Ferroelectric product  of Ba0,7Sr0,3TiO3  was characterized by Scanning Electron Microscopy (SEM). Sizes  of ferroelectric particle increased  with  sintering  temperatures,  as follow  1,67µm, 2,27µm,  and 2,38µm for samples with high temperature  of  600oC, 700oC and 800oC. Respectively then  the density of particle decreased with  temperature i.e 5,03x10-4 %, 4,40x10-4 %, and 1,52x10-4 %.  The average value of resistance increased  with  calcination  temperature  and sintering  temperature of 400oC, 600oC, 700oC and 800°C  i.e  6,716x108Ω, 6,740x108 Ω, 6,754x10 8 Ω and 6,768x108 Ω, as well as the value of the average resistivity increased with  rise  in calcination  temperature  and sintering temperature  as follow 193,122x108 Ωm, 194,884x108 Ωm, 196,784x108 Ωm,  and 198,882x108Ωm. These  were due to the effect of temperature on the arrangement  of the material  atoms.  It was concluded then the resistivity of a material does not depend on its geometric shape but depend on the temperature of the material.
PENGARUH AKTIVASI KARBON DIOKSIDA PADA PRODUKSI KARBON AKTIF MONOLIT DARI KAYU KARET Herniyanti, Septa; Taer, Erman; ', Sugianto
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

Activated carbon monoliths from rubber wood have successfully been fabricated using combined physical-chemical activation and chemical activation. The process of combination of physical-chemical activation was started from physical activation process by flowing CO2gas for 2 hours at temperature of 800 oC, then applying chemical activation process by immersing the carbon in 3 M KOH solution and 2,5 M H3PO4  solution. The samples activated by the combination  of physical-chemical activation were named as A1and those that were activated by chemical activation were named as sample A2.  Both activation methods yielded different activated carbon. The physical properties analyzed were density, porosity, and BET surface area, whereas the electrochemical property obtained from measurements using cyclic voltammogram method was specific capacitance. N2adsorption-desorption gas treatment resulted BET surface area of 542.586 m2g-1 and 115.147 m2g -1 for each sample, respectively. The resulted specific capacitances of the measurement using the cyclic voltammogram method for each sample were 43.67 F g-1and 37.74 F g-1 , respectively. Based on all obtained data analysis, it can be concluded that the physical-chemical activation produced larger BET surface area and higher specific capacitance than those resulted from chemical activation for supercapacitor cells.
PENENTUAN NILAI KALORI DETRITUS HUTAN MANGROVE DENGAN MENGGUNAKAN BOMB CALORIMETER Andi, Pos; ', Sugianto; Emrinaldi, Tengku
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Abstract

A  research  has  been conducted to determine a  calorie  quality    of mangrove detritus using Bomb  Calorimeter. The measurements  were carried out in  order to measure the physical parameters,  such as water content,  concentration of  ash, amount  of sulfur, and calorie content. Each sampel was treated on the same pressure and volume. The sampleswere taken from Dumai city on five different regions. Quality test  to the  samples resulted calorie content of 4.185 cal/g, the degree of water of 14,29 %, the  degree of ash of 4.48 % and the amount of sulfur of 0,03  %  for sample of point A.  Meanwhile for point B, C, D, and E, the value of calorie content, degree of water, degree of ash, and degree of sulfur were 4.195 cal/g, 4.139 cal/g, 4.164 cal/g, and 4.002 cal/g,  13,90 %, 14,30 %, 13,10 %,  and 13, 80 %, 4,84 %, 5,45 %, 4,59 %, and 6,10 %, and 0,11 %, 0,11 %, 0,15 %,  and  0,19 %, respectively . Among the four  physical parameters, calorie content is the most  important parameter to indicate the quality of detritus of mangrove. Based on the obtained data, the sample  of point B was the best sample  because of its highest calorie content compared to the other samples.