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Enhancing Electrocatalytic Methanol Oxidation on PtCuNi Core-Shell Alloy Structures in Acid Electrolytes
Qianqian Wu1,2, Xin Huang1, Tingting Wan1,2
1Department of Chemistry and Center for Atomic Engineering of Advanced Materials, School of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for In-organic/Organic Hybrid Functionalized Materials, Anhui University, Hefei, Anhui 230601, P. R. China.
New platinum-copper-nickel (PtCuNi) core-shell nanoparticles significantly boost methanol oxidation reaction kinetics for direct methanol fuel cells. These advanced catalysts offer superior activity and durability, enhancing fuel cell performance.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Direct methanol fuel cells (DMFCs) face challenges with sluggish methanol oxidation reaction (MOR) kinetics.
- Existing platinum-based catalysts suffer from poor anti-CO poisoning and inefficient platinum utilization.
- Developing advanced electrocatalysts is crucial for improving DMFC efficiency.
Purpose of the Study:
- To develop novel PtCuNi electrocatalysts with tunable inner and surface configurations for enhanced MOR.
- To investigate the catalytic activity and durability of PtCuNi core-shell alloy nanoparticles (PtCuNi-CS NPs).
Main Methods:
- Facile synthesis of PtCuNi-CS NPs with a Cu-rich core and Pt-rich shell via controlled nucleation/growth kinetics.
- Electrochemical characterization of MOR activity and CO poisoning resistance.
- Density functional theory (DFT) calculations to understand electronic structure and adsorption properties.
Main Results:
- PtCuNi-CS NPs exhibited significantly higher mass activity (5.7x) and specific activity (5.1x) for MOR compared to commercial Pt/C.
- DFT calculations confirmed that the optimized d-band center of PtCuNi-CS NPs enhances electro-oxidation activity.
- Doping with Cu and Ni atoms improved OH* adsorption, contributing to catalyst stability.
Conclusions:
- PtCuNi-CS NPs represent a highly efficient anode material for DMFCs due to their superior MOR performance.
- The study demonstrates an effective strategy for designing Pt-based trimetallic electrocatalysts.
- This research offers a promising pathway for advancing fuel cell technology.
