Articolo in rivista, 2023, ENG, 10.1002/celc.202201122

Electrodeposition of Ni Rh Alloys and their Use as Cathodes for Nitrate Reduction in Alkaline Solutions

Mattarozzi L.; Cattarin S.; Comisso N.; Musiani M.; Vázquez-Gómez L.; Verlato E.

ICMATE - CNR, Corso Stati Uniti 4, 35127 - Padova, Italy

Compact Ni-Rh alloys are electrodeposited potentiostatically on rotating disk and sheet electrodes; film compositions are adjusted by varying bath composition and deposition potential E-dep. SEM images of these alloys show a compact, globular morphology for Rh contents up to 30 at%, and a smoother aspect for films with a medium-to-high content of Rh. XRD spectra show the formation of a single crystalline phase, with diffraction peaks in intermediate positions between those of the constituent elements. Data analysis indicates that crystal lattice parameters vary with composition according to Vegard's law. Linear voltammetries of nitrate reduction in alkali highlight a maximum of activity, in terms of reduction current, for alloys in the range of 10-30 at.% Rh. Prolonged electrolysis at appropriate potential performed with Ni85Rh15 alloy shows, in comparison with pure Ni and pure Rh: much increased activity and faster abatement of nitrate; lower production of the undesired nitrite species; higher selectivity towards production of ammonia.

ChemElectroChem , pp. e202201122–?

Keywords

bimetallic electrocatalysts, electrodeposition, Ni-Rh alloys, nitrate reduction, wastewater treatment

CNR authors

Musiani Marco, Vazquez Gomez Lourdes, Verlato Enrico, Mattarozzi Luca, Cattarin Sandro, Comisso Nicola

CNR institutes

ICMATE – Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia

ID: 478317

Year: 2023

Type: Articolo in rivista

Creation: 2023-02-21 12:27:48.000

Last update: 2023-05-11 10:38:50.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:478317

DOI: 10.1002/celc.202201122

Scopus: 2-s2.0-85148056010

ISI Web of Science (WOS): 000939504800001