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All Journal Jurnal Sains Materi Indonesia Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences Journal of Renewable Energy and Mechanics
Jarot Raharjo
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Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Journal : Seminar Nasional Teknik Kimia Kejuangan

 1 
Studi Pengaruh Co-doping Neodymium (Nd) Terhadap Sifat Fisik Elektrolit Ce0.9Gd1-xNdxO2-z dengan Metode Sol-Gel untuk Aplikasi IT-SOFC Jarot Raharjo; masumi .; Wahyudin .
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Neodymium and Gadolinium co-doped ceria (Ce0.9Gd1-xNdxO2-z) is a promising alternative as a solidelectrolyte for intermediate temperature solid oxide fuel cell (IT-SOFC) due to its low operating temperatureand its high electrical conductivity. Ce0.9Gd1-xNdxO2-z powders, with x=0.25, 0.50 and 0.75mol% ofneodymium were successfully syhnthesized with a sol-gel method and citric acid as an organic precursor.The samples were calcined at temperature of 750oC for 5 hours. The powders properties were thencharacterized by X-ray diffraction, scanning electron microscopy, thermal gravimetry analysis, and thesintered pellets were evaluated by Archimedes method for calculate the density. Sintered Ce0.9Gd1-xNdxO2-zsamples exhibited the maximum theorical density of 97% which is suitable for solid electrolytes. TheCe0.9Gd1-xNdxO2-z powders consist of face-centered cubic fluorite ceria structure confirmed with x-raydiffraction (XRD). methodology investigated showed a better control of stoichiometry, impurities, and lowcost.
Pengaruh Temperatur Anil terhadap Sifat Elektrokimia Lantanum Pentanikel (LaNi5) dengan Penambahan Serium Oksida (CeO2) Ade Utami Hapsari; Jarot Raharjo; Yelvia Deni
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Annealing is one of the processes to increase capacity, discharge rate, and cycle life for anode AB5 type alloymaterial. Increasing the annealing temperature will increase capacity and homogenize material. This makesthe material more corrosion resistant and resistant to degradation during the process of absorption ordesorption of hydrogen atoms in the electrolyte solution. The study was conducted to see the characterizationof powders anode materials LaNi5 after the addition of 1% CeO2 and annealed at 300, 600, and 900°C for 6hours in an argon gas environment. The powders were characterized using XRD and SEM-EDX.Electrochemical testing is measured by using Electrochemical Impedance Spectroscopy (EIS) at a frequencyof 5 mHz - 100 kHz. Increasing anneal temperature changes the diffraction phase, decreasing conductivityand increasing the resistance value. Semicircle pattern of LaNi5 anode material with the addition of 1%CeO2 conducted annealing process shows the semicircle pattern with a radius of the arc increases. Thisindicates the magnitude of the resistance barrier material.
Studi Pengaruh Presipitan Basa Terhadap Sifat Fisik Nanomaterial Cerium Dioksida (CeO2) dengan Metode Presipitasi Jarot Raharjo; Hanif Yuliani; Ade Utami Hapsari; Damisih Damisih; Putri Widya Pangestika; Defi Rahma Santi
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2018: PROSIDING SNTKK 2018
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Co-Authors Ade Utami Hapsari Ade Utami Hapsari Ade Utami Hapsari Aghni Ulma Saudi Arya Sutrisna Damisih Damisih Damisih Damisih Dedikarni Defi Rahma Santi Deni Shidqi Khaerudini Hanif Yuliani Hanif Yuliani masumi . Oka Pradipta Arjasa Putri Widya Pangestika Retna Deca Pravitasari Syawaldi Kamaharudin Wahyudin . Yelvia Deni