Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 20, Pages 9760-9767Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta01926b
Keywords
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Funding
- Ballard Power Systems Inc.
- Catalysis Research for Polymer Electrolyte Fuel Cells (CaRPEFC)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Research Chair (CRC) Program
- Canada Foundation for Innovation (CFI)
- Ontario Research Fund (ORF)
- Automotive Partnership of Canada
- University of Western Ontario
- Chinese Scholarship Council
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Tantalum oxide (TaOx) nanoparticles (NPs) are deposited on a commercial Pt/C catalyst by an area-selective atomic layer deposition (ALD) approach to enhance the stability of the catalyst in proton exchange membrane fuel cells (PEMFCs). Due to the application of a blocking agent for protecting the Pt surface, TaOx particles are selectively nucleated and grown around Pt NPs. The TaOx loading on the Pt/C surface could be controlled precisely by varying the number of ALD cycles. When deposited on the Pt/C surface with 35 ALD cycles, the TaOx-anchored Pt NPs formed an excellent triple-junction structure of TaOx-Pt-carbon. The electrochemical durability tests indicated that the TaOx-anchored Pt/C catalyst showed comparable catalytic activity and superior long-term stability to Pt/C. Moreover, the long-term stability test in membrane electrode assembly (MEA) indicated a very low power density loss (12%) after a 120 h accelerated durability test. The significantly enhanced catalyst stability during PEMFCs operation is due to the anchoring effect of TaOx via strong metal oxide-support interactions. This strategy shows great potential for developing highly stable catalysts for PEMFCs.
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