Pt-doped Ru nanoparticles loaded on ‘black gold’ plasmonic nanoreactors as air stable reduction catalysts

Gunjan Sharma, Rishi Verma, Shinya Masuda, Khaled Mohamed Badawy, Nirpendra Singh, Tatsuya Tsukuda () and Vivek Polshettiwar ()
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Gunjan Sharma: Tata Institute of Fundamental Research
Rishi Verma: Tata Institute of Fundamental Research
Shinya Masuda: The University of Tokyo
Khaled Mohamed Badawy: Khalifa University
Nirpendra Singh: Khalifa University
Tatsuya Tsukuda: The University of Tokyo
Vivek Polshettiwar: Tata Institute of Fundamental Research

Nature Communications, 2024, vol. 15, issue 1, 1-16

Abstract: Abstract This study introduces a plasmonic reduction catalyst, stable only in the presence of air, achieved by integrating Pt-doped Ru nanoparticles on black gold. This innovative black gold/RuPt catalyst showcases good efficiency in acetylene semi-hydrogenation, attaining over 90% selectivity with an ethene production rate of 320 mmol g−1 h−1. Its stability, evident in 100 h of operation with continuous air flow, is attributed to the synergy of co-existing metal oxide and metal phases. The catalyst’s stability is further enhanced by plasmon-mediated concurrent reduction and oxidation of the active sites. Finite-difference time-domain simulations reveal a five-fold electric field intensification near the RuPt nanoparticles, crucial for activating acetylene and hydrogen. Kinetic isotope effect analysis indicates the contribution from the plasmonic non-thermal effects along with the photothermal. Spectroscopic and in-situ Fourier transform infrared studies, combined with quantum chemical calculations, elucidate the molecular reaction mechanism, emphasizing the cooperative interaction between Ru and Pt in optimizing ethene production and selectivity.

Date: 2024
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DOI: 10.1038/s41467-024-44954-4

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