Light-Off in Plasmon-Mediated Photocatalysis

被引:18
|
作者
Tiburski, Christopher [1 ]
Boje, Astrid [1 ]
Nilsson, Sara [1 ]
Say, Zafer [1 ]
Fritzsche, Joachim [1 ]
Strom, Henrik [2 ]
Hellman, Anders [1 ]
Langhammer, Christoph [1 ]
机构
[1] Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden
[2] Chalmers Univ Technol, Dept Mech & Maritime Sci, S-41296 Gothenburg, Sweden
关键词
nanoalloys; heterogeneous catalysis; plasmonics; photothermal; CO oxidation; gold-palladium; photocatalysis; ALTERNATIVE MECHANISM; ASSISTED PHOTOCATALYSIS; METAL NANOPARTICLES; HOT-ELECTRONS; CHEM.-SCI; CATALYSTS; PHOTOCHEMISTRY; DISSOCIATION; MODEL; HEAT;
D O I
10.1021/acsnano.1c01537
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:11535 / 11542
页数:8
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