Origin of the synergistic effects of bimetallic nanoparticles coupled with a metal oxide heterostructure for accelerating catalytic performance

Abstract

Precisely tuning bicomponent intimacy during reactions by traditional methods remains a formidable challenge in the fabrication of highly active and stable catalysts because of the difficulty in constructing well-defined catalytic systems and the occurrence of agglomeration during assembly. To overcome these limitations, a PtRuPNiO@TiO_x catalyst on a Ti plate was prepared by ultrasound-assisted low-voltage plasma electrolysis. This method involves the oxidation of pure Ti metal and co-reduction of strong metals at 3000°C, followed by sonochemical ultrasonication under ambient conditions in an aqueous solution. The intimacy of the bimetals in PtRuPNiO@TiO_x is tuned, and the metal nanoparticles are uniformly distributed on the porous titania coating via strong metal-support interactions by leveraging the instantaneous high-energy input from the plasma discharge and ultrasonic irradiation. The intimacy of PtRuPNiO@TiO_x increases the electron density on the Pt surface. Consequently, the paired sites exhibit a high hydrogen evolution reaction activity (an overpotential of 220 mV at a current density of 10 mA cm⁻² and Tafel slope of 186 mV dec⁻¹), excellent activity in the hydrogenation of 4-nitrophenol with a robust stability for up to 20 cycles, and the ability to contrast stated catalysts without ultrasonication and plasma electrolysis. This study facilitates industrially important reactions through synergistic chemical interactions.

Keywords

bimetals / nanoparticles / oxides / heterostructures / hydrogenation

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2024 The Author(s). SusMat published by Sichuan University and John Wiley & Sons Australia, Ltd.