Proton-exchange-membrane fuel cells (PEMFCs) are clean and sustainable mobile power sources for transportation. Recently, their deployment in heavy-duty vehicles (HDVs) has attracted growing interest owing to their high energy scalability and lower infrastructure requirements. However, to meet the stringent requirements for efficiency and long-term durability for HDV applications, PEMFCs typically employ a relatively high platinum group metal (PGM) loading (>0. 2 mgPGM/cm2). This elevated PGM loading significantly increases the stack and system costs, surpassing the U. S. Department of Energy (DOE) target of 60/kW for commercial viability. Reducing PGM loading while maintaining performance and durability remains a central challenge for HDV fuel cells. Here we exploit metal oxide-Pt interactions and utilize the strong CeOx-Pt interaction to design a CeOx@Pt catalyst structure with exceptional durability. At a low total PGM loading (0. 1 mgPGM/cm2), the CeOx@Pt/C catalyst demonstrates high fuel cell performance (8. 8 kW/gPGM) and stability (power retention >90%) after the challenging HDV durability testing (90, 000 accelerated-stress-test cycles). With the CeOx@Pt/C catalyst, we showcase over 70% reduction in Pt cost from the M2FCT target (to 9/kW), highlighting its promising potential for enabling stable and cost-effective fuel cell systems for heavy-duty applications.
Peng et al. (Fri,) studied this question.