Nickel nanowires-based composite material applied to the highly enhanced non-enzymatic electro-oxidation of ethanol

MARÍA L. RAMÍREZ; GUSTAVO A. RIVAS; CECILIA S. TETTAMANTI; PAULA BERCOFF; FABIANA GUTIERREZ; MARCELA C. RODRIGUEZ

MICROCHEMICAL JOURNAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018 vol. 142 p. 159 - 166

0026-265X

In this work, we report the building of a nanostructured platform withbiomimetic activity towards the non-enzymatic oxidation of ethanol. Thisbiomimetic nanostructured platform was obtained by including Ni nanowires(NiNWs) in a graphite matrix composite. The NiNWs were obtained byelectrochemical synthesis using commercial aluminum oxide templates andcharacterized by scanning electronic microscopy (SEM), X-ray emission (EDS)and X-ray diffraction (XRD). The biomimetic composite transducers (CPENiNWs)was studied by cyclic voltammetry, amperometry and electrochemicalimpedance spectroscopy (EIS) assays. CPE-NiNWs proved to be highlysensitive for the detection of ethanol in 0.10 M NaOH, demonstrating a widelinear range (1.0 x 10-4-1.1 x 10-2 M) and a detection limit of 3.10 x 10-7 M. CPENiNWs was used for the efficient quantification of ethanol in alcoholicbeverages, obtaining results comparable to those reported by themanufacturers. The operational conditions of CPE-NiNWs were accomplishedin terms of the best analytical performance for non-enzymatic quantification ofethanol. CPE-NiNWs demonstrated a very good short-term stability (for 5successive determinations using the same surface), proving an outstandinglong-term stability allowing its use for at least 60 days.