Co 2 S 3 thin layer: unusual electrochemical behaviour during direct Ni electroplating
2007; Taylor & Francis; Volume: 85; Issue: 4 Linguagem: Inglês
10.1179/174591907x192249
ISSN1745-9192
AutoresL. Naruškevičius, B. Šimkūnaitė, G. Valiulienė, A. Žielienė, Vitalija Jasulaitienė, A. Sudavičius, Marius Baranauskas, Vidas Pakštas, Arūnas Stankevičius,
Tópico(s)Advanced battery technologies research
ResumoAbstractThe electrochemical behaviour of Co2S3 layers deposited on glassy carbon and ABS plastic from colloidal Co(III) compound solution was investigated by cyclic voltammetry and X-ray photoelectron spectroscopy, Auger electron spectroscopy, XRD techniques in Watts Ni electroplating and Ni2+ free background electrolytes. On the basis of experimental data, it was assumed that Co2S3 converts into NiS when it is cathodically polarised at E≈−0·2 V (SHE) in the Watts electrolyte. During this process, the sheet resistance of the layer decreases from ∼3 × 109 to ∼3 × 103 Ω □−1. This change goes on with the direct participation of Ni2+ ions in the electrolyte and this is probably of crucial importance for the following electrodeposition of metallic Ni initiated at more negative potentials. Contrary to Cu2–xS and Bi2S3, the layer of Co2S3 cannot be electroreduced to metallic Co in the Ni2+ free background electrolyte.Keywords: CO2S3NI PLATINGCYCLIC VOLTAMMETRYX-RAY PHOTOELECTRON SPECTROSCOPYX-RAY DIFFRACTIONSHEET RESISTANCE
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