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Optimizing metal-support interphase for efficient fuel cell oxygen reduction reaction catalyst.

Divya Nechiyil1, Meenakshi Seshadhri Garapati2, Rashmi Chandrabhan Shende2

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Journal of Colloid and Interface Science
|November 19, 2019
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Summary
This summary is machine-generated.

We developed a novel nitrogen-sulphur co-doped hybrid support for proton exchange membrane fuel cells (PEMFCs). This new electro-catalyst significantly enhances fuel cell performance and durability.

Keywords:
Carbon nanotubeCo-dop ingOxygen reduction reactionProton exchange membrane fuel cellPt nanoparticle interaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Conversion

Background:

  • Proton exchange membrane fuel cells (PEMFCs) require cost-effective, highly-efficient electro-catalysts.
  • Developing advanced catalyst supports is crucial for improving PEMFC performance and durability.

Purpose of the Study:

  • To introduce a novel nitrogen-sulphur co-doped 1D-2D hybrid support for enhanced electro-catalyst performance.
  • To investigate the impact of support structure on catalyst distribution, bonding, and electrochemical activity.

Main Methods:

  • Synthesis of a partially exfoliated carbon nanotube-few layer graphene hybrid support (PECNT).
  • Nitrogen-sulphur co-doping of the PECNT support.
  • Decoration of platinum (Pt) nanoparticles onto the support.
  • Characterization using Raman spectroscopy and STEM-EDS.
  • Electrochemical evaluation including H2O2 formation and half-wave potential measurements.
  • Proton exchange membrane fuel cell performance testing.

Main Results:

  • The nitrogen-sulphur co-doped PECNT support ensured uniform distribution and improved bonding of Pt nanoparticles.
  • Pt nanoparticles on the NS-PECNT support exhibited higher electrochemical active surface area and mass activity.
  • The novel electro-catalyst demonstrated lower H2O2 formation and improved positive half-wave potential compared to controls.
  • Fuel cell tests showed higher power density for Pt/NS-PECNT compared to Pt/NS-(rGO-PECNT) and commercial Pt/C.

Conclusions:

  • The interconnectivity between Pt nanoparticles and dopant/defect sites on the support is key to enhancing oxygen reduction reaction (ORR) activity.
  • The novel NS-PECNT support significantly improves electro-catalyst activity, fuel cell performance, and durability.
  • This work presents a promising strategy for developing advanced electro-catalysts for PEMFCs.