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Pyrolysis of Iron(III) porphyrin coated Pt/C toward oxygen reduction reaction in acidic medium
- Source :
- Progress in Natural Science: Materials International, Vol 30, Iss 6, Pp 832-838 (2020)
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Design and synthesis of highly active and durable electrocatalysts toward oxygen reduction reaction (ORR) is of particular importance for proton exchange membrane fuel cells (PEMFCs), yet remains a grand challenge. Herein, we report the deposition of iron (III) porphyrin (FeP) on house-made Pt/C by rotary evaporation of the mixture of FeP and house-made Pt/C dispersed in chloroform, followed by pyrolysis at 650 °C in argon atmosphere. This approach led to the synthesis of new non-precious metal electrocatalyst (NPME)-Pt/C composites (Pt/C–FeP) with an average nanoparticle diameter of 3.1 ± 1.5 nm without aggregation. According to X-ray photoelectron spectroscopy (XPS), the binding energy of Pt 4f7/2 became larger due to the presence of pyrolyzed FeP. In addition, the electrochemically active surface area (ECSA) of Pt/C–FeP-650 is 65 m2/g less than that of house-made Pt/C (80.2 m2/g). This implies that the pyrolyzed FeP may have partially covered the surface of Pt nanoparticles and thus lowering the ECSA. Interestingly, the mass activity (MA) of Pt/C–FeP turns out to be 349.0 mA/mgPt @0.9 V vs. RHE, which is 2.6 times and 1.5 times of house-made Pt/C and commercial Pt/C, respectively. It is speculated that the electronic interaction and possible synergy between Pt and pyrolyzed FeP as NPME might have contributed to the ORR activity improvement despite of partial loss of ECSA. During accelerated durability tests (ADTs), the MA of Pt/C–FeP-650 degrades 64.3% inferior to commercial Pt/C (52.2%). The main reason likely arises from the degradation of pyrolyzed FeP, which is a bottleneck problem confronting NPMEs.
- Subjects :
- Materials science
Proton exchange membrane fuel cell
Nanoparticle
02 engineering and technology
010402 general chemistry
Electrocatalyst
01 natural sciences
Durability
Oxygen reduction reaction
Metal
chemistry.chemical_compound
X-ray photoelectron spectroscopy
lcsh:TA401-492
General Materials Science
Electrocatalysts
Proton exchange membrane fuel cells
021001 nanoscience & nanotechnology
Porphyrin
Evaporation (deposition)
0104 chemical sciences
chemistry
visual_art
visual_art.visual_art_medium
Mass activity
lcsh:Materials of engineering and construction. Mechanics of materials
0210 nano-technology
Pyrolysis
Nuclear chemistry
Subjects
Details
- ISSN :
- 10020071
- Volume :
- 30
- Database :
- OpenAIRE
- Journal :
- Progress in Natural Science: Materials International
- Accession number :
- edsair.doi.dedup.....4e0923a56e327c6eb40682617eca1212