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Updated: Jul 5, 2025
Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
Pt Nanoparticle-Mn Single-Atom Pairs for Enhanced Oxygen Reduction
Xiaoqian Wei1,2,3, Shaojia Song4, Weiwei Cai5
1National Key Laboratory of Green Pesticide, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
This study introduces a novel platinum-manganese single-atom catalyst (PtNP-MnSA/C) that overcomes limitations in oxygen reduction reaction (ORR) catalysis. The new catalyst demonstrates enhanced activity and stability, reducing platinum usage for efficient fuel cells.
Area of Science:
- Electrochemistry
- Materials Science
- Catalysis
Background:
- Platinum-based catalysts are crucial for the oxygen reduction reaction (ORR) in electrochemical devices.
- Existing catalysts face challenges due to strong scaling relationships and trade-offs between activity, stability, and cost.
- High platinum loadings contribute significantly to catalyst cost.
Purpose of the Study:
- To develop an efficient and cost-effective ORR catalyst that overcomes intrinsic limitations of platinum-based systems.
- To investigate the synergistic effects of platinum nanoparticles and manganese single atoms on ORR performance.
- To enhance the activity, stability, and reduce platinum content in ORR catalysts.
Main Methods:
- Synthesis of carbon-supported platinum nanoparticle and manganese single atom (PtNP-MnSA/C) catalysts.
- Experimental characterization of catalyst structure and composition.
- Electrochemical evaluation of ORR activity and stability in acidic media.
- Theoretical investigations (e.g., DFT calculations) to understand reaction mechanisms and electronic properties.
Main Results:
- The PtNP-MnSA/C catalyst exhibits significantly enhanced ORR activity with a half-wave potential of 0.93 V vs RHE and a mass activity 19 times higher than commercial Pt/C.
- Manganese single atoms (MnSA) facilitate O2 dissociation, modulate the electronic structure of Pt sites, and enhance catalyst stability.
- The catalyst demonstrates excellent structural stability, with only a 5% activity decline after 80,000 potential cycles, and low Fenton-like reactivity.
- A fuel cell utilizing PtNP-MnSA/C achieved a high power density of 1214 mW/cm2.
Conclusions:
- The synergistic interaction between Pt nanoparticles and Mn single atoms effectively circumvents the activity-stability-cost trade-offs in ORR catalysis.
- PtNP-MnSA/C represents a highly promising catalyst for electrochemical energy conversion technologies, offering superior performance with reduced platinum loading.
- The design strategy provides a new avenue for developing advanced, cost-effective catalysts for the oxygen reduction reaction.
