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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
Published on: April 27, 2018
Low-Loading Pt Nanoparticles Anchored on Niobium Nitride for Highly Efficient Alkaline Hydrogen Evolution
Siyi Yang1, Guimin Wang1, Wei Yang1
1Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, National Center for International Research on Catalytic Technology, Heilongjiang University, Harbin 150080, China.
Developing advanced electrocatalysts is key for efficient water electrolysis. This study introduces novel niobium nitride-supported platinum catalysts (Pt/Nb4N5) that significantly boost hydrogen evolution reaction (HER) performance and durability in alkaline conditions.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Platinum (Pt)-based catalysts are essential for the hydrogen evolution reaction (HER) in anion-exchange membrane water electrolyzers.
- The high cost and limited availability of Pt necessitate the development of low-Pt alternatives that maintain high efficiency and durability.
- Accelerating the Volmer step in HER is crucial for improving overall catalytic performance.
Purpose of the Study:
- To develop highly active and durable low-Pt electrocatalysts for the alkaline hydrogen evolution reaction (HER).
- To investigate niobium nitrides as stable and conductive supports for Pt nanoparticles.
- To engineer Pt/Nb4N5 heterostructures with enhanced interfacial properties for improved HER catalysis.
Main Methods:
- A polyoxoniobate-based molecular self-assembly strategy was employed to synthesize Nb4N5 nanospheres.
- Ultrafine platinum nanoparticles (NPs) were immobilized onto Nb4N5 nanospheres to form Pt/Nb4N5 heterostructures.
- Electrocatalytic HER performance was evaluated using techniques such as overpotential, Tafel slope, and mass activity measurements.
Main Results:
- The Pt/Nb4N5 catalyst exhibited exceptional HER performance with a low overpotential of 22 mV at 10 mA cm⁻² and a Tafel slope of 26 mV dec⁻¹.
- A 11.5-fold higher mass activity at 150 mV was observed compared to commercial Pt/C catalysts, indicating significantly enhanced catalytic efficiency.
- The Pt/Nb4N5-based electrolyzer demonstrated remarkable durability and required only 1.508 V to achieve a current density of 10 mA cm⁻².
Conclusions:
- The engineered Pt/Nb4N5 heterostructures, benefiting from strong metal-support interactions, significantly enhance charge transfer and catalytic activity for alkaline HER.
- Niobium nitride supports provide excellent conductivity and stability, crucial for high-performance electrocatalysts.
- This work presents a promising strategy for designing cost-effective, highly active, and durable low-Pt electrocatalysts for energy conversion applications like water electrolysis.
