Optical Excitation of a Nanoparticle Cu/p-NiO Photocathode Improves Reaction Selectivity for CO2 Reduction in Aqueous Electrolytes

Nano Letters
Joseph S DuCheneHarry A Atwater

Abstract

We report the light-induced modification of catalytic selectivity for photoelectrochemical CO2 reduction in aqueous media using copper (Cu) nanoparticles dispersed onto p-type nickel oxide (p-NiO) photocathodes. Optical excitation of Cu nanoparticles generates hot electrons available for driving CO2 reduction on the Cu surface, while charge separation is accomplished by hot-hole injection from the Cu nanoparticles into the underlying p-NiO support. Photoelectrochemical studies demonstrate that optical excitation of plasmonic Cu/p-NiO photocathodes imparts increased selectivity for CO2 reduction over hydrogen evolution in aqueous electrolytes. Specifically, we observed that plasmon-driven CO2 reduction increased the production of carbon monoxide and formate, while simultaneously reducing the evolution of hydrogen. Our results demonstrate an optical route toward steering the selectivity of artificial photosynthetic systems with plasmon-driven photocathodes for photoelectrochemical CO2 reduction in aqueous media.

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Citations

Jul 19, 2020·Nanomaterials·Thinh Luong The NguyenJacinto Sá
Dec 3, 2020·Nanomaterials·Ruben F HamansAndrea Baldi
Oct 20, 2020·Chemical Society Reviews·Wanlin GaoSang-Eon Park
Oct 27, 2020·Advanced Science·Hyunhwa LeeJeong Young Park
Jul 3, 2021·Journal of the American Chemical Society·Wan Jae DongZetian Mi
Aug 26, 2021·The Journal of Physical Chemistry Letters·Zhandong Li, Dmitry Kurouski
Jan 9, 2021·Nano Letters·Yocefu HattoriJacinto Sá
Dec 15, 2020·ACS Nano·Emiliano CortésPrineha Narang
Apr 15, 2020·ACS Nano·Giulia TagliabueHarry A Atwater
Sep 18, 2021·Chemical Society Reviews·Jian ZhaoJinghong Li

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