425204 Enhancement Mechanisms By Metal Co-Catalysts and Plasmonic Nanoparticles in the Photo-Electrochemical Activity of Semiconductors

Monday, November 9, 2015: 3:35 PM
355D (Salt Palace Convention Center)
Paul Hernley, Chemical Engineering, University of Michigan, Ann Arbor, MI and Suljo Linic, Department of Chemical Engineering, University of Michigan, Ann Arbor, MI

In this contribution, I will shed light on the microscopic mechanisms involved in the enhancement of the photo-electrochemical performance of semiconductors by the joint action of metal co-catalysts and plasmonic metal nanoparticles. In particular, I will focus on the effect of Pt co-catalysts and Ag plasmonic nanoparticles on the activity of Si for the photo-electrochemical evolution of hydrogen.1–3 In addition to the description of my experimental findings, I will present a mathematical model that can capture all the main features of this fairly complex photo-electrocatalytic system. I will discuss how my findings can be transferred to any composite co-catalyst/plasmonic-metal/semiconductor photo-electrochemical system.

(1)   Hou, Y.; Abrams, B.; Vesborg, P. Nat. Mater. 2011, 10, 434–438.

(2)   Lombardi, I.; Marchionna, S.; Zangari, G.; Pizzini, S. Langmuir 2007, 23, 12413–12420.

(3)   Ingram, D. B.; Christopher, P.; Bauer, J. L.; Linic, S. ACS Catal. 2011, 1, 1441–1447.

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