Synergistic effect of nano-Pt and Ni spine for HER in alkaline solution: hydrogen spillover from nano-Pt to Ni spine

The design of active, stable, and cost-effective electrocatalysts for the H 2 evolution reaction (HER) in alkaline conditions is important for electrochemical systems such as the chloro-alkaline process and H 2 production. Here we report catalysts comprising Pt on Ni single crystalline spines (Pt/Ni...

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Bibliographic Details
Published in:Scientific reports 2018-02, Vol.8 (1), p.2986-9, Article 2986
Main Authors: Abbas, Syed Asad, Kim, Seong-Hoon, Iqbal, Muhammad Ibrahim, Muhammad, Shoaib, Yoon, Won-Sub, Jung, Kwang-Deog
Format: Article
Language:English
Subjects:
140/146
639/166/898
639/638/161/886
Absorption spectroscopy
Catalysts
Electrochemistry
Humanities and Social Sciences
multidisciplinary
Nanoparticles
Photoelectron spectroscopy
Platinum
Science
Science (multidisciplinary)
Spectrum analysis
Spine
Synergistic effect
Transmission electron microscopy
X-ray absorption spectroscopy
X-ray diffraction
X-rays
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Summary:The design of active, stable, and cost-effective electrocatalysts for the H 2 evolution reaction (HER) in alkaline conditions is important for electrochemical systems such as the chloro-alkaline process and H 2 production. Here we report catalysts comprising Pt on Ni single crystalline spines (Pt/Ni-SP) with high activity and stability for HER in alkaline solution with proposed mechanism. The Pt/Ni-SP catalysts are prepared by dispersing platinum nanoparticles (1.7–3.1 nm) on the single-crystalline spines (Ni-SP) of Ni urchin-like particles. The size and coverage of Pt nanoparticles on Ni-SP are increased with increases in the Pt loading amount. X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy are performed to observe the structure of the Pt/Ni-SP catalyst. The catalysts achieve the mass activity of 1.11 A mg −1 (Pt) , comparing favorably to Pt/C catalysts with the mass activity of 0.33 A mg −1 (Pt) at 0.05 V overpotential. The Tafel slope of the Pt/Ni-SP catalyst is approximately 30 mV dec −1 , similar to that of Pt, while Pt/Ni-SP is very stable in alkaline solution, like Ni. The synergistic effect of Pt/Ni-SP is ascribed to H spillover from Pt to Ni.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-21396-9