Sintesis Fe3O4 dengan Metode Elektrokimia sebagai Elektrokatalis pada Metal-Air Batteries

Pratama, Oky Iyan and Izzati, Rizkiyah Fitri (2017) Sintesis Fe3O4 dengan Metode Elektrokimia sebagai Elektrokatalis pada Metal-Air Batteries. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh pH larutan elektrolit dan voltase terhadap waktu pembentukan Fe3O4, efisiensi sintesis, serta karakteristik produk, mengetahui mekanisme reaksi pembentukan Fe3O4 melalui perubahan warna elektrolit, dan mengetahui kinerja magnetite sebagai elektrokatalis reaksi reduksi oksigen pada metal-air batteries. Partikel magnetite disintesis dengan metode elektro oksidasi besi dalam air demin menggunakan multielektroda dan pengadukan selama 3 jam disertai pengamatan perubahan warna dan timbulnya gelembung. Larutan elektrolit yang digunakan divariasi pada pH 7–14 menggunakan voltase 25 V dan didapatkan produk magnetite dengan surface area terbesar dan efisiensi terbaik pada variabel pH 9. Kemudian dilanjutkan sintesis magnetite menggunakan variabel voltase 10V, 20V, dan 30V. Produk berupa serbuk hitam dikarakterisasi menggunakan analisa BET, XRD, dan SEM, serta uji kinerja elektrokatalis mengguanakan Cyclic Voltammetry dan Polarisasi Linier. Berdasarkan penilitian yang telah dilakukan dapat ditarik kesimpulan bahwa, semakin tinggi pH dalam rentang 8-11 dan semakin tinggi voltase yang digunakan, maka waktu pembentukan Fe3O4 semakin cepat. pH larutan elektrolit yang tidak terlalu tinggi atau rendah (pH 9) menghasilkan efisiensi sintesis terbaik sebesar 54%, sedangkan voltase yang digunakan tidak terlalu berpengaruh. Larutan elektrolit dengan pH tidak terlalu tinggi atau rendah (pH 9) juga menghasilkan surface area terbesar yaitu 178,42 m2/g, dan semakin rendah voltase yang digunakan (10V) menghasilkan surface area terbesar yaitu 127,09 m2/g. Sedangkan kristalinitas terbaik pada variabel voltase 30 V. Mekanisme reaksi pembentukan magnetite dimulai dari perubahan warna elektrolit dari bening menjadi kuning kecoklatan yang merupakan Fe(OH)2, kemudian warna coklat kemerahan yang merupakan FeOOH, dan warna hitam yang mengindikasi terbentuknya Fe3O4. Dengan menggunakan analisis Cyclic Voltammetry dan Polarisasi Linear dapat menunjukkan bahwa partikel magnetite kristal dapat digunakan sebagai elektrokatalis pada metal-air batteries.================================================= The objective of this research is to discover the effect of pH of electrolyte solution and voltage on the formation time of Fe3O4, synthesis efficiency and also product characteristics. This research also aims to understand the performance of magnetite as electrocatalyst of oxygen’s reduction reaction in metal-air batteries. The magnetite particles were successfully synthesized via electrooxidation of iron in demineralized water using multielectrode and agitation for 3 hours, followed by observation in color transformation and bubble appearance. Electrolyte solutions were varied at pH 7 – 14 using voltage of 25 V and it were obtained the magnetite products with the widest surface area and the best efficiency at pH 9’s variable. Subsequently, this experiement was continued by magnetite synthesis process using voltage variables of 10 V, 20 V and 30 V. Black powder products were then characterized using BET, XRD, SEM and also electrocatalyst perfomance test using Cyclic Voltammetry and Linear Polarization. According to the conducted experiment, it can be concluded that higher pH in range 8-11 and higher voltage which are utilized will produce more rapid formation time of Fe3O4. pH of electrolyte solution which was not sufficient high or low (pH 9) generated the best syntesis efficiency 54 % while voltage did not overmuch affect. Electrolyte solution with unsufficient high or low pH (pH 9) also generated the widest surface area of 178,42 m2/g while the lower voltage which was utilized (10V) produced the widest surface area of 127,09 m2 /g. Additionally, the best cristalinity was shown by voltage variable 30 V. The reaction mechanism of magnetite reaction was initiated by color transformation of electrolyte from limpid into brownish-yellow color which were Fe(OH)2, and afterwards the color became reddish-brown which were FeOOH and finally came into black which was indicated as Fe3O4 formation. From the analysis using cyclic voltammetry and linear polarization, it can be shown that magnetite can be utilized as electrocalayst in metal-air batteries.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Elektrokimia, Magnetite, Elektrokatalis, Electrochemical, Magnetite, Metal-air Batteries
Subjects: Q Science
Q Science > QD Chemistry
Q Science > QD Chemistry > QD501 Catalysis. Catalysts.
Divisions: Faculty of Industrial Technology > Chemical Engineering > (S1) Undergraduate Theses
Depositing User: Oky Iyan Pratama
Date Deposited: 03 Oct 2017 04:44
Last Modified: 06 Mar 2019 06:43
URI: http://repository.its.ac.id/id/eprint/44227

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