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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
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Ordered Mesoporous Intermetallic Ga-Pt Nanoparticles: Phase-Controlled Synthesis and Performance in Oxygen Reduction
Hao Lv1, Yuenan Zheng2,3, Yanzhi Wang1
1Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China.
Angewandte Chemie (International Ed. in English)
|April 14, 2023
Summary
Precisely synthesized gallium-platinum nanoparticles with controlled phases show opposite oxygen reduction reaction (ORR) performance. The chiral Ga1Pt1 phase offers superior ORR activity and stability compared to Ga3Pt5 and commercial catalysts.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Optimizing intermetallic compounds for catalysis requires precise phase control.
- Synthesizing ordered intermetallics with controlled mesoscopic structures is challenging.
- Phase-dependent catalytic performance is rarely reported due to synthesis difficulties.
Purpose of the Study:
- To precisely synthesize two phase-pure mesoporous intermetallic gallium-platinum (meso-i-Ga-Pt) nanoparticles.
- To investigate the intermetallic phase-dependent catalytic performance for oxygen reduction reaction (ORR).
- To explore the effect of chiral atomic arrangements on catalytic activity and stability.
Main Methods:
- Precise synthesis of meso-i-Ga-Pt nanoparticles by tuning gallium salts with different anions.
- Characterization of synthesized nanoparticles, including phase purity and mesoscopic structure.
- Systematic evaluation of ORR electrocatalytic performance in alkaline media.
Main Results:
- Successfully synthesized phase-pure meso-i-Ga3Pt5 (orthorhombic) and meso-i-Ga1Pt1 (chiral cubic) nanoparticles.
- Demonstrated completely opposite catalytic performance for ORR in alkaline media between the two phases.
- The chiral meso-i-Ga1Pt1 catalyst exhibited significantly higher ORR activity and stability (5.9 and 3.2 enhancement factors) compared to meso-i-Ga3Pt5 and commercial Pt/C.
Conclusions:
- Intermetallic phase control is crucial for optimizing electrocatalytic properties.
- Chiral atomic arrangements in meso-i-Ga1Pt1 nanoparticles enhance ORR performance.
- Precisely engineered intermetallic nanoparticles offer a promising alternative to commercial catalysts for ORR.
