Broadband Plasmonic Photocatalysis Enhanced by Photothermal Light Absorbers

Abstract

Plasmonic photocatalysis is an emerging research field that holds promise for sustainable energy applications, particularly in solar energy conversion. In this study, we focus on the enhancement of broadband light absorption capabilities for plasmonic photocatalysts under white light illumination. By replacing parts of the catalyst with a solar absorber, we can significantly improve the total reaction rate under mild heating conditions with less catalyst. Through careful comparison of reaction conditions and systematic optimization of the contributions from photothermal and nonthermal effects, we demonstrate a substantial enhancement in broadband light absorption capacity and overall light effectiveness, paving the way for advanced plasmonic photocatalysts with greater efficiency and practical applicability using solar light as the energy source.

Hot Electrons in Catalysis

“…An et al report the fabrication of plasmonic metal–semiconductor photoelectrodes that generate hot electrons under visible-light excitation and achieve efficient splitting of seawater. Geng et al report that, by hybridizing rhodium nanoparticles with solar absorbers such as titanium nitride (TiN), plasmonic CO 2 reduction catalysis can be achieved with milder degrees of heating and light illumination. Ma et al present solar-powered redox cells based on TiO 2 nanostructures functionalized with Au NPs.…”

Mechanism of photocatalytic CO2 methanation on ultrafine Rh nanoparticles

“…Photocatalysis of CO 2 hydrogenation provides an alternative way to lower the reaction temperature while achieving desirable reaction activity and selectivity and maintaining the stability of the catalysts. Recent examples include the use of Z-scheme semiconductor heterostructures 7–9 and metal/support composites involving the photothermal effect, 10–16 non-thermal effect, 17–19 and metal–support interfacial interactions. 20 Photocatalysis of CO 2 hydrogenation on supported Rh NPs has also been recently investigated to improve the reaction kinetics and selectivity of CH 4 .…”