TY - JOUR
T1 - Co-Ni alloy coatings electrodeposited using real leachates generated from positive electrodes of Ni[sbnd]Cd batteries
AU - Altamirano-Garcia, Liliana
AU - Luna-Sánchez, Rosa M.
AU - Sosa-Rodríguez, Fabiola S.
AU - Cabrera-Sierra, Román
AU - Vazquez-Arenas, Jorge
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/11/15
Y1 - 2021/11/15
N2 - The feasibility to recover a Co[sbnd]Ni alloy is evaluated in the present study by electrodeposition using real liquors from the leaching of Ni[sbnd]Cd batteries (positive electrodes) in H2SO4, with saccharin as additive. Ni content in the alloy rises with increasing the applied current density for all baths, while current efficiencies higher than 70% are achieved with the use of the sulfate-chloride electrolyte containing saccharin. The additive could strongly interact with chloride to suppress the occurrence of parasitic reactions (H+ and H2O reductions), while the formation of chlorocomplexes particularly of Ni(II) accelerate their reduction on the electrode surface. This mixed electrolyte also enables to obtain more pure Co[sbnd]Ni alloys at −600 A m−2, as detected in the analysis of O composition (5.12 at.%/1.36 wt%). The impurities favorably affected the contributions of both parasitic reactions. Saccharin predominantly blocks H2O reduction at high overpotential, but not H+ discharge at low overpotential. The particle size and shape of the alloys strongly rely on current density imposed and bath composition. All deposits contain Cd, although its content is considerably less favored as the current density is increased to −600 A m−2. XRD confirms the microstructure of the formed alloys, mainly comprised of the following planes: Ni(111) and Co(111), CoOOH(003) and Cd(OH)2(001).
AB - The feasibility to recover a Co[sbnd]Ni alloy is evaluated in the present study by electrodeposition using real liquors from the leaching of Ni[sbnd]Cd batteries (positive electrodes) in H2SO4, with saccharin as additive. Ni content in the alloy rises with increasing the applied current density for all baths, while current efficiencies higher than 70% are achieved with the use of the sulfate-chloride electrolyte containing saccharin. The additive could strongly interact with chloride to suppress the occurrence of parasitic reactions (H+ and H2O reductions), while the formation of chlorocomplexes particularly of Ni(II) accelerate their reduction on the electrode surface. This mixed electrolyte also enables to obtain more pure Co[sbnd]Ni alloys at −600 A m−2, as detected in the analysis of O composition (5.12 at.%/1.36 wt%). The impurities favorably affected the contributions of both parasitic reactions. Saccharin predominantly blocks H2O reduction at high overpotential, but not H+ discharge at low overpotential. The particle size and shape of the alloys strongly rely on current density imposed and bath composition. All deposits contain Cd, although its content is considerably less favored as the current density is increased to −600 A m−2. XRD confirms the microstructure of the formed alloys, mainly comprised of the following planes: Ni(111) and Co(111), CoOOH(003) and Cd(OH)2(001).
KW - Co[sbnd]Ni alloy
KW - Current density
KW - Electrodeposition
KW - Ni-Cd battery
KW - Real liquors
KW - Saccharin
UR - http://www.scopus.com/inward/record.url?scp=85114744693&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2021.127672
DO - 10.1016/j.surfcoat.2021.127672
M3 - Artículo
AN - SCOPUS:85114744693
SN - 0257-8972
VL - 425
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
M1 - 127672
ER -