Karpov_Ambient Effect_CPL_elsart_Rev.pdf (306.83 kB)
A Nonthermal Chemicurrent Effect of Hydrogen Adsorption on Pt/SiC Planar Nanostructures at Normal Ambient Conditions
journal contributionposted on 2013-12-03, 00:00 authored by S. K. Dasari, M. A. Hashemian, J. Mohan, E. G. Karpov
Reaction induced currents in planar metal/semiconductor nanostructures can provide a direct insight into underlying charge transfer processes involved in chemical energy dissipation at solid surfaces. This letter provides clear evidence of the nonthermal nature of chemicurrent induced by H-2 adsorption on a Pt/SiC nanostructure at room temperature in 760 Torr N-2/O-2 mixtures with various oxygen fractions. The thermal effect of the reaction is reproduced also with admission of N-2 molecules to the sample. Only the process with H-2 leads to a detectable chemicurrent proving participation of nonthermal electrons in the charge transfer induced by hydrogen evolution on the nanostructure surface.
This work has been supported by National Science Foundation via grant #1033290
Publisher StatementNOTICE: This is the author’s version of a work that was accepted for publication in Chemical Physics Letters . Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemical Physics Letters, Vol 553, (2012) DOI: 10.1016/j.cplett.2012.09.066