Analisis Karakteristik Material dan Performa Elektrokimia Katalis PtNi3, PtCr3, DAN PtNi1,5Cr1,5 Untuk Katoda Proton Exchange Membrane Fuel Cell

Rafi, Geraldy (2023) Analisis Karakteristik Material dan Performa Elektrokimia Katalis PtNi3, PtCr3, DAN PtNi1,5Cr1,5 Untuk Katoda Proton Exchange Membrane Fuel Cell. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Proton Exchange Membrane Fuel Cell (PEMFC) adalah teknologi yang dapat mengkonversi hidrogen dan oksigen menjadi listrik dengan tantangan utama biaya katalis berbasis platina yang sangat mahal. Sehingga reduksi platina dalam katalis menjadi strategi paling efisien namun tetap meningkatkan performa elektrokimia. Aktivitas, selektivitas, dan stabilitas adalah karakteristik utama yang dipengaruhi oleh struktur kristal, morfologi, dan jenis material katalis. Paduan bi-metallic PtNi3 dan PtCr3 telah terbukti dapat meningkatkan performa elektrokimia katalis sehingga penelitian lebih lanjut terkait tri-metallic PtNi1.5Cr1.5 dilakukan dengan menggunakan metode impregnasi reduktan kuat NaBH4.Selain itu, rekayasa struktur nano katalis dengan metode acid leaching pada PtNi3, PtCr3, dan PtNi1,5Cr1,5 dilakukan guna meningkatkan aktivitas dari katalis dan menganalisis pengaruh rekayasa struktur nano pada katalis tri-metallic PtNi1,5Cr1,5. Penelitian ini menunjukkan parameter optimum pada penggunaan parameter temperatur, durasi, dan metode reaksi reduksi menggunakan NaBH4 yaitu dengan menggunakan 0°C, metode ice bath, dan selama 3 jam. Setelah itu, parameter optimum pada durasi acid leaching ditunjukkan dengan durasi optimum selama 22 jam Penurunan nilai ECSA 57% dan performa elektrokimia ORR terjadi jika katalis diberikan acid leaching selama 24h. Perlakuan acid leaching pada katalis tri-metallic PtNi1.5Cr1.5/C dapat meningkatkan ECSA dan performa elektrokimia. Penurunan kandungan nikel dan krom terjadi setelah diberikan perlakuan acid leaching yang dibuktikan dari hasil SEM-EDX. Hasil analisis pada variasi paduan katalis, katalis tri-metallic PtNi1.5Cr1.5/C AL memiliki nilai ECSA (22,35 m2/gPt) yang lebih rendah daripada PtNi3/C AL sebesar 30,12 m2/gPt namun lebih tinggi daripada PtCr3/C AL dan PtNi1.5Cr1.5/C Non-AL. Sedangkan perfroma elektrokimia ORR PtNi1.5Cr1.5/C lebih baik daripada PtCr3/C AL dan PtNi3/C AL. Densitas daya maksimum jika diurutkan dari yang terbaik adalah PtNi1.5Cr1.5/C AL sebesar 80,24 mW/cm2, PtCr3/C AL sebesar 56,64 mW/cm2, PtNi3/C AL sebesar 59,93 mW/cm2.
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Proton Exchange Membrane Fuel Cell (PEMFC) is a technology that can convert hydrogen and oxygen into electricity with the main challenge of very expensive platinum-based catalyst costs. Therefore, reduction of platinum in the catalyst is the most efficient strategy while still improving electrochemical performance. Activity, selectivity, and stability are the main characteristics influenced by the crystal structure, morphology, and material type of the catalyst. The bi-metallic PtNi3 and PtCr3 alloys have been proven to improve the electrochemical performance of the catalyst so further research on tri-metallic PtNi1.5Cr1.5 was conducted using the NaBH4 strong reductant impregnation method. In addition, nanostructure engineering of the catalysts by acid leaching method on PtNi3, PtCr3, and PtNi1.5Cr1.5 was conducted to improve the activity of the catalysts and analyze the effect of nanostructure engineering on the tri-metallic PtNi1.5Cr1.5 catalyst. This study shows the optimum parameters on the use of temperature parameters, duration, and reduction reaction method using NaBH4 by using 0°C, ice bath method, and for 3 hours. It is proven by the increase of ECSA and ORR electrochemical performance for PtNi1.5Cr1.5/C 3h catalyst. This is shown by the ECSA value of 22.35 m2/gPt, E1/2 of 0.77, Jlim of 7.5 mA/cm2, and onset potential of 0.87 mV. After that, the optimum parameters for acid leaching duration were shown with an optimum duration of 22 hours with an ECSA value of 3.33 cm-2, E1/2 of 0.64, Jlim of 6.78 mA/cm2, and onset potential of 0.82 mV. A decrease in ECSA value and ORR electrochemical performance occurs when the catalyst is subjected to acid leaching for 24h by 57% for ECSA, 0.01 mV lower E1/2 difference, and 22% decrease in maximum current density. On the tri-metallic PtNi1.5Cr1.5/C catalyst, acid leaching treatment can also improve ECSA and ORR electrochemical performance. Morphological changes occur to irregular after acid leaching treatment as evidenced by SEM results. The results of the analysis on the variation of catalyst alloys, tri-metallic PtNi1.5Cr1.5/C AL catalyst has a lower ECSA value of 22.35 m2/gPt than PtNi3/C AL of 30.12 m2/gPt but higher than PtCr3/C AL and PtNi1.5Cr1.5/C Non-AL. While the ORR electrochemical performance of PtNi1.5Cr1.5/C is better than PtCr3/C AL and PtNi3/C AL. The maximum power density when sorted from the best is PtNi1.5Cr1.5/C AL at 80.24 mW/cm2, PtCr3/C AL at 56.64 mW/cm2, PtNi3/C AL at 59.93 mW/cm2.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Catalyst, PEMFC, Platinum, Trimetallic, Katalis, PEMFC, Platina, Trimetallic
Subjects:	Q Science > QD Chemistry > QD115 Electrochemical analysis T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2931 Fuel cells
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Geraldy Rafi
Date Deposited:	25 Jul 2023 04:26
Last Modified:	25 Jul 2023 04:26
URI:	http://repository.its.ac.id/id/eprint/99240

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