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

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

 

 

 

 

 

 

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