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Hierarchical approach of mitigating carbon influence in nano-porous electro-catalyst with unique surface islands for efficient methanol resistive oxygen reduction
- Source :
- Electrochimica Acta. 262:306-318
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- For the first time, we report a facile one pot aqueous method for support-free Pd85Pt15 nano-porous structures (NPoS) synthesis from PdMn nano-alloys at ambient conditions. A hierarchical approach was successfully employed through a simple “self-settlement” process with descending amounts of carbon to carbon-free electro-catalysts to improve catalyst utilization and avoid carbon degradation during fuel cell operating conditions. Pd85Pt15 NPoS exhibits enhanced methanol resistive oxygen reduction reaction (ORR) activity owing to the presence of highly active and unique surface PdPt islands compared to HiSPEC Pt/C catalysts. Accelerated durability tests of the support-free PdPt NPoS show enhanced durability in harsh acidic environment (1.0 N H2SO4) compared to HiSPEC Pt/C and DOE 2017–2020 durability target. Preliminary direct methanol fuel cell studies using hierarchically derived Pd85Pt15 NPoS variants were performed at ultra-low Pt content. The effects of carbon content and catalyst layer thickness on fuel cell activities are well discussed.
- Subjects :
- Resistive touchscreen
Materials science
Aqueous solution
General Chemical Engineering
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Durability
Oxygen reduction
0104 chemical sciences
Catalysis
chemistry.chemical_compound
Direct methanol fuel cell
chemistry
Chemical engineering
Electrochemistry
Methanol
0210 nano-technology
Carbon
Subjects
Details
- ISSN :
- 00134686
- Volume :
- 262
- Database :
- OpenAIRE
- Journal :
- Electrochimica Acta
- Accession number :
- edsair.doi...........0ee518dff9c39148b7587eb992dacb72