Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 27, Pages 17268-17275Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04548
Keywords
fuel cells; electrocatalysts; oxygen reduction reaction; bimetallic nanoparticles; metal-organic frameworks
Funding
- Higher Education Commission (HEC) of Pakistan [20-1638/RD/09/2900]
- National University of Singapore [CENGas R-261-508-001-646]
- Singapore Ministry of Education (MOE AcRF Tier 1) [R-279-000-410-112]
- Singapore Ministry of Education (MOE AcRF Tier 2) [R-279-000-429-112]
- IRSIP scholarship of Higher Education Commission (HEC) of Pakistan
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The development of highly competent electrocatalysts for the sluggish oxygen reduction reaction (ORR) at cathodes of proton exchange membrane fuel cells (PEMFCs) is extremely important for their long-term operation and wide applications. Herein, we present highly efficient ORR electrocatalysts based on Pt/Ni bimetallic nanoparticles dispersed on highly porous carbon obtained via pyrolysis of a metal-organic framework MOF-5. In comparison to the commercial Pt/C (20%), the electrocatalyst Pt-Ni/PC 950 (15:15%) in this study exhibits a pronounced positive shift of 90 mV in E-onset. In addition, it also demonstrates excellent long-term stability and durability during the 500-cycle continue-oxygen-supply (COS) accelerating durability tests (ADTs). The significantly improved activity and stability of Pt-Ni/PC 950 (15:15%) can be attributed to the Pt electron interaction with Ni and carbon support as has been proved in X-ray and microscopic analysis.
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