Light-Off in Plasmon-Mediated Photocatalysis
Artikel i vetenskaplig tidskrift, 2021

In plasmon-mediated photocatalysis it is of critical importance to differentiate light-induced catalytic reaction rate enhancement channels, which include near-field effects, direct hot carrier injection, and photothermal catalyst heating. In particular, the discrimination of photothermal and hot electron channels is experimentally challenging, and their role is under keen debate. Here we demonstrate using the example of CO oxidation over nanofabricated neat Pd and Au50Pd50 alloy catalysts, how photothermal rate enhancement differs by up to 3 orders of magnitude for the same photon flux, and how this effect is controlled solely by the position of catalyst operation along the light-off curve measured in the dark. This highlights that small fluctuations in reactor temperature or temperature gradients across a sample may dramatically impact global and local photothermal rate enhancement, respectively, and thus control both the balance between different rate enhancement mechanisms and the way strategies to efficiently distinguish between them should be devised.

plasmonics

CO oxidation

photocatalysis

gold-palladium

heterogeneous catalysis

photothermal

nanoalloys

Författare

Christopher Tiburski

Chalmers, Fysik, Kemisk fysik

Astrid Boje

Chalmers, Fysik, Kemisk fysik

Sara Nilsson

Chalmers, Fysik, Kemisk fysik

Zafer Say

Chalmers, Fysik, Kemisk fysik

Joachim Fritzsche

Chalmers, Fysik, Kemisk fysik

Henrik Ström

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Anders Hellman

Chalmers, Fysik, Kemisk fysik

Christoph Langhammer

Chalmers, Fysik, Kemisk fysik

ACS Nano

1936-0851 (ISSN) 1936-086X (eISSN)

Vol. 15 7 11535-11542

Ämneskategorier

Kemiska processer

Atom- och molekylfysik och optik

Annan fysik

DOI

10.1021/acsnano.1c01537

PubMed

34156229

Mer information

Senast uppdaterat

2021-07-29