Hierarchical PtCuMnP Nanoalloy for Efficient Hydrogen Evolution and Methanol Oxidation
Padmini Basumatary1, Ji-Hyeok Choi1, Dimpul Konwar1,2
1Department of Materials Science and Engineering, Gachon University, Bokjung-dong, Seongnam-si, Gyeonggi-Do, 1342, Republic of Korea.
Small Methods
|March 10, 2024
Summary
A novel platinum (Pt) nanoalloy electrocatalyst, PtCuMnP/N-rGO, offers high performance for both hydrogen evolution and methanol oxidation reactions. This low-Pt catalyst demonstrates excellent activity, stability, and anti-poisoning properties, addressing key challenges in fuel cell technology.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- High platinum (Pt) loading and susceptibility to poisoning are significant limitations for Pt-based electrocatalysts in methanol oxidation reactions within fuel cells.
- Developing efficient electrocatalysts with reduced Pt content and enhanced durability is crucial for advancing methanol fuel cell technology.
Purpose of the Study:
- To engineer a high-performance, bifunctional electrocatalyst for both hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR).
- To synthesize a low-Pt content nanoalloy incorporating copper (Cu), manganese (Mn), and phosphorus (P) supported on nitrogen-doped reduced graphene oxide (N-rGO).
Main Methods:
- Synthesis of ultrasmall PtCuMnP nanoalloy (≈2.9 nm) on N-doped graphene oxide support using a modified solvothermal method.
- Comprehensive characterization using various analytical techniques.
- Electrochemical evaluation of the electrocatalyst's performance for HER and MOR, including activity, mass activity, and stability tests (chronoamperometry).
Main Results:
- The PtCuMnP/N-rGO electrocatalyst exhibited a low overpotential (6.5 mV at 10 mA cm-2) and high mass activity for the hydrogen evolution reaction in acidic media.
- For methanol oxidation, PtCuMnP/N-rGO demonstrated a mass activity 7.43 times higher than commercial Pt/C (20% Pt).
- The catalyst maintained 72% of its initial current density after 20,000 cycles in chronoamperometry, indicating excellent stability and anti-poisoning capabilities.
Conclusions:
- The developed PtCuMnP/N-rGO electrocatalyst is a promising bifunctional material for efficient hydrogen evolution and methanol oxidation.
- The low Pt content, combined with doping and support modification, leads to superior catalytic activity, stability, and resistance to poisoning, addressing critical challenges in fuel cell applications.
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