Sains Malaysiana 41(2)(2012): 237–244

Kesan Parameter Pemprosesan dan Bahan Tambah Terhadap Pengendapan Elektroforetik

Filem LSCF6428

(Effects of Processing Parameters and Additives on Electrophoretic Deposited LSCF6428 Films)

Hamimah Abd. Rahman

Institut Sel Fuel, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D.E. Malaysia

Andanastuti Muchtar*, Syaharizan Haron, Norhamidi Muhamad & Huda Abdullah

Fakulti Kejuruteraan dan Alam Bina, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D.E. Malaysia

Received: 28 January 2011 / Accepted: 19 August 2011

ABSTRAK

Kaedah pengendapan elektroforetik (EPD) semakin mendapat perhatian dalam pembentukan komponen sel fuel oksida pepejal (SOFC). Kaedah EPD menggunakan pelarut organik atau pelarut bukan akueus banyak diaplikasikan terutamanya untuk penghasilan komponen elektrolit SOFC. Dalam kajian ini, filem LSCF6428 telah dihasilkan melalui kaedah EPD yang menggunakan air ternyahion sebagai pelarut akueus. Sebagai permulaan, serbuk LSCF6428 sebanyak 1% berat (1 wt%) diampaikan di dalam air ternyahion. Seterusnya, ampaian dengan nilai pH3 digunakan untuk proses EPD. Peningkatan nilai voltan kenaan (3-7 V) dan tempoh pengendapan (3-10 min) didapati telah menyumbang kepada penambahan amaun filem LSCF6428 yang diendapkan. Penggunaan kanji sebagai bahan tambah didapati berjaya membantu meningkatkan kualiti filem endapan dengan merujuk kepada berat endapan yang lebih tinggi dan endapan yang sekata. Pemilihan voltan kenaan dan proses pengeringan yang sesuai perlu diambil berat bagi mengelakkan keretakan filem endapan. Hasil kajian menunjukkan bahawa morfologi dan berat filem LSCF6428 yang diendapkan sangat bergantung kepada voltan kenaan, masa pengendapan dan penggunaan bahan tambah bagi proses EPD.

Kata kunci: Filem LSCF6428; kanji; pelarut akueus; pengendapan elektroforetik (EPD)

ABSTRACT

The application of electrophoretic deposition (EPD) method in the fabrication of solid oxide fuel cell (SOFC) components has attracted interest. The EPD method frequently employs organic or non-aqueous solvent for the fabrication of SOFC components especially electrolyte. In this study, the LSCF6428 film was developed via the EPD method using an aqueous solvent. To begin with, 1 wt% of LSCF6428 powder was suspended in deionised water. The EPD process was then applied on the suspension with pH3. An increase in the applied voltage (3-7 V) and deposition time (3-10 min) was found to contribute to the increased amount of the deposited LSCF6428 films. With reference to the higher amount and uniform deposition of films, the use of starch as an additive material has been shown to successfully improve the quality of the deposited films. The applied voltage and drying conditions must be carefully selected in order to avoid cracking of the deposited films. The results showed strong dependence of the morphology and weight of the LSCF6428 films on the applied voltage, deposition time and the use of additive materials in the EPD process.

Keywords: Aqueous solvent; electrophoretic deposition (EPD); LSCF6428 film; starch

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*Corresponding author; email: muchtar@eng.ukm.my