Abstract
Both structure and interface engineering are highly effective strategies for enhancing the catalytic activity and selectivity of precious metal nanostructures. In this work, we develop a facile pyrolysis strategy to synthesize the high-quality holey platinum nanotubes (Pt-H-NTs) using nanorods-like PtII-phenanthroline (PT) coordination compound as self-template and self-reduction precursor. Then, an up-bottom strategy is used to further synthesize polyallylamine (PA) modified Pt-H-NTs (Pt-H-NTs@PA). PA modification sharply promotes the catalytic activity of Pt-H-NTs for the formic acid electrooxidation reaction (FAEOR) by the direct reaction pathway. Meanwhile, PA modification also elevates the catalytic activity of Pt-H-NTs for the hydrogen evolution reaction (HER) by the proton enrichment at electrolyte/electrode interface. Benefiting from the high catalytic activity of Pt-H-NTs@PA for both FAEOR and HER, a two-electrode FAEOR boosted water electrolysis system is fabricated by using Pt-H-NTs@PA as bifunctional electrocatalysts. Such FAEOR boosted water electrolysis system only requires the operational voltage of 0.47 V to achieve the high-purity hydrogen production, showing an energy-saving hydrogen production strategy compared to traditional water electrolysis system.
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