Surface-Plasmon-Assisted Photoelectrochemical Reduction of CO2 and NO3−on Nanostructured Silver Electrodes

Surface-Plasmon-Assisted Photoelectrochemical Reduction of CO2 and NO3on Nanostructured Silver Electrodes

TitleSurface-Plasmon-Assisted Photoelectrochemical Reduction of CO2 and NO3on Nanostructured Silver Electrodes
Publication TypeJournal Article
Year of Publication2018
AuthorsYoungsang Kim, Erin B Creel, Elizabeth R Corson, Bryan D McCloskey, Jeffrey J Urban, Robert Kostecki
JournalAdvanced Energy Materials
Volume8
Issue22
Pagination1800363
Date Published08/2018
Abstract

Electrochemical reduction of carbon dioxide (CO2) typically suffers from low selectivity and poor reaction rates that necessitate high overpotentials, which impede its possible application for CO2 capture, sequestration, or carbon‐based fuel production. New strategies to address these issues include the utilization of photoexcited charge carriers to overcome activation barriers for reactions that produce desirable products. This study demonstrates surface‐plasmon‐enhanced photoelectrochemical reduction of CO2 and nitrate (NO3−) on silver nanostructured electrodes. The observed photocurrent likely originates from a resonant charge transfer between the photogenerated plasmonic hot electrons and the lowest unoccupied molecular orbital (MO) acceptor energy levels of adsorbed CO2, NO3−, or their reductive intermediates. The observed differences in the resonant effects at the Ag electrode with respect to electrode potential and photon energy for CO2 versus NO3− reduction suggest that plasmonic hot‐carriers interact selectively with specific MO acceptor energy levels of adsorbed surface species such as CO2, NO3−, or their reductive intermediates. This unique plasmon‐assisted charge generation and transfer mechanism can be used to increase yield, efficiency, and selectivity of various photoelectrochemical processes.

DOI10.1002/aenm.201800363
Short TitleAdv. Energy Mater.
Refereed DesignationRefereed