ZB 06 - Nanoelectrochemistry (W.Nogala)

Patterning Cu nanostructures tailored for CO2 reduction to electrooxidizable fuels and oxygen reduction in alkaline media

Author(s): Michalak, Magdalena and Roguska, Agata and Nogala, Wojciech and Opallo, Marcin
Title: Patterning Cu nanostructures tailored for CO2 reduction to electrooxidizable fuels and oxygen reduction in alkaline media
Abstract: Due to the limited availability of noble metal catalysts, such as palladium, or gold, their substitution by more abundant is highly advisable. Considerably challenging is the controlled reproducible synthesis of stable non-noble metallic nanostructures accessible active sites. Here, we report a method of preparation of (ligand-free) Cu nanostructures from polycrystalline metal in a manner. This procedure relies on heterogeneous localized of polycrystalline Cu on indium tin oxide (ITO) and carbon as model supports using scanning electrochemical (SECM). The morphology of nanostructures and thus their properties are tunable by adjusting the electrorefining i.e., the electrodeposition voltage, the translation rate of metal source and the composition of the supporting electrolyte. The of the obtained materials towards the carbon dioxide reduction (CO2RR), oxygen reduction reaction (ORR) in alkaline media and evolution reaction (HER), is studied by feedback mode SECM. Cu nanostructures obtained at a high concentration of chloride exhibit enhanced electrocatalytic activity. Nanostructures under high cathodic overpotentials possess a high ratio with a large number of catalytic sites active the reversible CO2RR and ORR. The CO2RR yields easily compounds - formic acid and carbon monoxide. The HER to occur efficiently at the crystallographic facets of Cu nanostructures electrodeposited under mild polarization.
Pages: 2645-2653
Journal: NANOSCALE ADVANCES
Publisher: ROYAL SOC CHEMISTRY
Addres: THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Volume: 1
ID: ISI:000478576700018
Year: 2019
DOI: 10.1039/c9na00166b