2018
DOI: 10.1149/2.0531802jes
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Unsupported Pt3Ni Aerogels as Corrosion Resistant PEFC Anode Catalysts under Gross Fuel Starvation Conditions

Abstract: Mitigating catalyst corrosion is crucial for the commercial success of polymer electrolyte fuel cells (PEFCs). Novel catalysts that can withstand the harsh conditions in case of gross fuel (i.e. H 2 ) starvation events at the PEFC anode are needed to increase the fuel cell stack's service life and to meet the durability targets set for automotive applications. To make progress in this respect, we have tested an unsupported, bimetallic Pt 3 Ni alloy (aerogel) catalyst at the PEFC anode and subjected it to a str… Show more

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Cited by 21 publications
(31 citation statements)
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“…Despite this remarkable initial ORR-activity at low current densities, significant deviations from this kinetically controlled behavior (see the 70 mV·dec –1 slope dashed line in Figure b) are observed at current densities >15 A·g catalyt –1 (corresponding to >20 mA cm –2 in Figure a). Such performance losses are often related to the mass transport properties of the catalyst upon processing into a catalyst layer (CL), which are determined by its agglomerate morphology and pore size distribution and can be studied using focused ion beam scanning electron microscopy (FIB-SEM) . The CL cross-section image obtained using this technique and displayed in Figure c reveals low open porosity (i.e., low content of pores >50 nm in width), which causes poor O 2 - and H 2 O-transport.…”
Section: Resultsmentioning
confidence: 99%
“…Despite this remarkable initial ORR-activity at low current densities, significant deviations from this kinetically controlled behavior (see the 70 mV·dec –1 slope dashed line in Figure b) are observed at current densities >15 A·g catalyt –1 (corresponding to >20 mA cm –2 in Figure a). Such performance losses are often related to the mass transport properties of the catalyst upon processing into a catalyst layer (CL), which are determined by its agglomerate morphology and pore size distribution and can be studied using focused ion beam scanning electron microscopy (FIB-SEM) . The CL cross-section image obtained using this technique and displayed in Figure c reveals low open porosity (i.e., low content of pores >50 nm in width), which causes poor O 2 - and H 2 O-transport.…”
Section: Resultsmentioning
confidence: 99%
“…Therefore, Henning et al prepared an unsupported, bimetallic Pt 3 Ni aerogel and employed as anode catalyst for polymer electrolyte fuel cell (PEFC) application. The Pt 3 Ni electrocatalyst exhibits excellent durability and performance retention under stringent conditions and 35% higher mass activity towards hydrogen oxidation reaction compared to commercial Pt/C catalyst [81]. These results suggest that these metallic aerogel nanostructures are the sustainable electrocatalytic materials for fuel cell applications.…”
Section: Oxide Aerogelsmentioning
confidence: 91%
“…[9][10][11] Besides, mass transfer in the PEMFC worsens due to porosity decay, ionomer redistribution and decreasing hydrophobicity within the CLs. 6,[12][13][14] Possible collapse of CL porous structure further exacerbates the issue. 1,15,16 As a result, small extent of carbon weight loss (in the order of 5%-10%) can already lead to deterioration of the fuel cell performance and the failure in meeting the PEMFC durability target.…”
Section: List Of Symbolsmentioning
confidence: 99%