Electroreduction of CO 2 on Au(310)@Cu High-index Facets.

Authors :: Liang L
Feng Q
Wang X
Hübner J
Gernert U
Heggen M
Wu L
Hellmann T
Hofmann JP
Strasser P
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2023 Mar 13; Vol. 62 (12), pp. e202218039. Date of Electronic Publication: 2023 Feb 08.
Publication Year :: 2023
Abstract: The chemical selectivity and faradaic efficiency of high-index Cu facets for the CO <subscript>2</subscript> reduction reaction (CO <subscript>2</subscript> RR) is investigated. More specifically, shape-controlled nanoparticles enclosed by Cu {hk0} facets are fabricated using Cu multilayer deposition at three distinct layer thicknesses on the surface facets of Au truncated ditetragonal nanoprisms (Au DTPs). Au DTPs are shapes enclosed by 12 high-index {310} facets. Facet angle analysis confirms DTP geometry. Elemental mapping analysis shows Cu surface layers are uniformly distributed on the Au {310} facets of the DTPs. The 7 nm Au@Cu DTPs high-index {hk0} facets exhibit a CH <subscript>4</subscript> : CO product ratio of almost 10 : 1 compared to a 1 : 1 ratio for the reference 7 nm Au@Cu nanoparticles (NPs). Operando Fourier transform infrared spectroscopy spectra disclose reactive adsorbed *CO as the main intermediate, whereas CO stripping experiments reveal the high-index facets enhance the *CO formation followed by rapid desorption or hydrogenation.<br /> (© 2023 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH.)