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Sains Malaysiana 45(3)(2016): 459–465 Pengaruh Suhu Sinter terhadap Prestasi
Elektrokimia Katod Komposit Sel Bahan Api Oksida Pepejal (SOFC)
LSCF-SDCC (Effects of Sintering Temperature on the
Electrochemical Performance of Solid Oxide Fuel Cell (SOFC)
composite cathode LSCF-SDCC) NURUL
AKIDAH
BAHARUDDIN,
ANDANASTUTI
MUCHTAR*,
MAHENDRA
RAO
SOMALU,
ABU BAKAR
SULONG
& HUDA ABDULLAH Institut
Sel Fuel, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor
Darul Ehsan, Malaysia Received: 17 March 2015/Accepted:
10 December 2015 ABSTRAK Kertas kajian ini membincangkan
kesan suhu pensinteran ke atas prestasi elektrokimia katod komposit
sel bahan api oksida pepejal LSCF-SDCC. Katod komposit LSCD-SDCC
disediakan dengan nisbah berat 50:50 dan dihasilkan
melalui kaedah pengedapan elektroforetik (EPD). Kaedah EPD dijalankan
ke atas kedua belah sisi substrat SDCC untuk menghasilkan sel simetri.
Sel simetri yang terhasil adalah menggunakan suhu sinter yang berbeza
(550°C hingga 750°C)
sebelum analisis ke atas mikrostruktur dan ujian prestasi
elektrokimia dijalankan. Kesan suhu sinter ke atas keliangan permukaan
dikaji menggunakan analisis spektrometer serakan tenaga sinar-X,
mikroskop elektron imbasan pancaran medan dan J-image. Kemudian,
hubungan antara rintangan pengutuban, Rp dengan
suhu sinter diukur menggunakan spektroskop elektrokimia impedans.
LSCF-SDCC
yang telah disinter pada suhu 600°C memberikan nilai Rp terendah iaitu 0.68 Ω pada
suhu operasi 650°C. Kajian ini mencadangkan bahawa suhu sinter
antara julat 550-650°C sebagai suhu pensinteran terbaik untuk menghasilkan
katod komposit LSCF-SDCC berprestasi tinggi. Kata kunci: Komposit; pensinteran;
sel bahan api oksida pepejal ABSTRACT The effects of sintering temperature
on the electrochemical performance of solid oxide fuel cell composite
cathode LSCF-SDCC are discussed in this paper.
An LSCF-SDCC composite cathode was prepared at 50:50 weights
percentage ratios. The LSCF-SDCC film was fabricated through
electrophoretic deposition (EPD) method. EPD was
conducted on both sides of the SDCC substrate to produce a symmetrical
cell. The symmetrical cell was subjected to different sintering
temperatures (550°C to 750°C) before undergoing microstructure analysis
and an electrochemical performance test. The effects of sintering
temperature change on film surface porosity were first investigated
by energy-dispersive X-ray spectroscopy, field emission scanning
electron microscopy and ImageJ analysis. Then, the relation of polarisation
resistance, Rp, with the sintering temperatures was established
through electrochemical impedance spectroscopy. LSCF-SDCC
that was sintered at 600°C exhibited the lowest Rp
value of 0.68 Ω when operated at 650°C. The results showed
that sintering temperature in the range of 550°C to 650°C is the
best sintering temperature to produce a high-performance LSCF-SDCC composite cathode. Keywords: Composites; sintering; solid oxide fuel cell REFERENCES Chiba,
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email: muchtar@ukm.edu.my
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