4.6 Article

Large-Scale Fabrication of Hollow Pt3Al Nanoboxes and Their Electrocatalytic Performance for Hydrogen Evolution Reaction

Journal

ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 11, Pages 9842-9847

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00372

Keywords

Hollow nanostructures; Alloying; Pt3Al; Intermetallic compound; Hydrogen evolution reaction

Funding

  1. N2020: Nanotechnology Based Functional Solutions [NORTE-45-2015-02]
  2. Portuguese Foundation of Science and Technology [IF/01595/2014]

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Hollow structuring and alloying have been known to be effective methods to improve physicochemical properties and create new functionalities of nanomaterials. However, it is technically difficult to fabricate hollow alloyed intermetallic compound nanostructures, which are emerging as promising electrocatalysts for water splitting, in a controllable and scalable manner using current wet chemical routes. Here, we report a simple method allowing for large-scale fabrication of hollow Pt3Al nanoparticles using a melt-spinning and subsequent self-templating etching route. We demonstrate that upon etching, both microstructure and phase composition changed, leading to the transformation of Al-rich PtAl6 intermetallic compound ribbons to interconnected hollow nanoparticles of Pt-rich Pt3Al with sizes varying from 4 to 22 nm. The electrochemical measurement shows that the hollow Pt3Al intermetallic nanoparticles have better electrocatalytic activity and catalytic stability than commercial Pt/C catalysts for the hydrogen evolution reaction in alkali media, showing that the hollow Pt3Al nanobox can be used as potential cathode catalysts for water splitting. The facile melt-spinning and self-templating etching route can be readily extended to fabricate other noble-metal-based alloy hollow nanostructures on a large scale for various applications.

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