Investigation of fabrication methods for a cathode using a non-precious metal catalyst in polymer electrolyte membrane f
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Investigation of fabrication methods for a cathode using a non-precious metal catalyst in polymer electrolyte membrane fuel cell Bongho Lee, Jong Gyeong Kim, and Chanho Pak† Graduate Program of Energy Technology, School of Integrated Technology, Institute of Integrated Technology, Gwangju Institute of Science and Technology, Gwangju 61005, Korea (Received 13 April 2020 • Revised 17 June 2020 • Accepted 19 July 2020) AbstractAs the need for fuel cell systems increases, much research is underway to replace platinum catalysts. Therefore, non-precious metal catalysts composed of inexpensive metal have attracted attention. Along with catalyst development, the importance of electrode development is emphasized. In this study, two manufacturing methods using a commercial non-Pt catalyst (FeNC) for cathode were adopted to investigate the effect of the method on the performance of membrane electrode assembly (MEA) for polymer electrolyte membrane fuel cell (PEMFC). Additionally, the effect of different ionomer ratios in the catalyst slurry compositions on the electrode was studied. As a result, the MEA with cathode fabricated by the spray method displayed 2.87-times higher performance than that of MEA with cathode by gas diffusion electrode that is manufactured using the Doctor-blade method. The higher performance of the spray electrode is attributed to the large portions of the pores under 10 nm in the electrode estimated by the mercury intrusion porosimetry. Therefore, it is important to generate large numbers of mesopores to fabricate a high-performance electrode of the non-precious metal catalyst for PEMFC. Keywords: Non-precious Metal Catalyst, Fabrication Method, Spray Coating, Polymer Electrolyte Membrane Fuel Cell
pose, much research has been done on Pt-alloys, Pt de-alloys, coreshell catalyst, and non-precious metal catalysts (MPNC) for several decades [15-21]. Among them, the development of NPMC, especially FeNC-based catalysts with activity for oxygen reduction reaction (ORR) have been attracting great attention as an alternative to lower the cost of the catalysts because it does not use precious metal components. Along with the development of FeNC-based catalysts, FeNCbased catalysts having ORR activity similar to that of Pt catalysts have been reported [14,25-27]. However, to realize performance in the membrane electrode assembly (MEA) level similar to that of the Pt catalyst, the catalyst layer must be at least four-times larger than that of the Pt catalyst [28,29]. Thus, it is still demanded the investigation of the fabrication method for cathode using the NPMC because the research on the electrode manufacturing has not progressed much. In this study, the MEA performance of the commercial FeNC catalyst cathode manufactured by two different methods such as spray method and gas diffusion electrode (GDE) method was investigated. MEA performance was also measured according to the different ionomer content such as 37.5, 50, and 60 wt%
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