Electrodeposition of NiOOH is an attracting route toward nanosized films of NiO, a p-type semiconductor used in many advanced applications. In this paper, the deposition mechanism is thoroughly investigated aiming at the clarification of the deposition dynamics and the chemical nature of the deposit. We focused on initial stages of the potentiostatic deposition on ITO, which yields a nanostructured film. In the potential range investigated the process is mass transport controlled and strongly overlaps with oxygen evolution reaction. The nucleation regime, which is finely tunable, correlates with the surface extension of the film. Supporting electrolytes are found to suppress the deposition, likely by modifying the nickel speciation in the aqueous electrolyte. Further, through XPS investigation we shed light on the mixed γ−β NiOOH nature of the deposited film and its electrochemistry. This work provides precious understanding for future exploitations of anodic electrodeposited NiO, especially in applications where a strict control on surface morphology and thickness at the nanoscale level is mandatory.

Investigating the electrodeposition mechanism of anodically grown NiOOH films on transparent conductive oxides / Di Girolamo, D.; Piccinni, Marco; Matteocci, F.; Marrani, A. G.; Zanoni, R.; Dini, D.. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 319:(2019), pp. 175-184. [10.1016/j.electacta.2019.06.170]

Investigating the electrodeposition mechanism of anodically grown NiOOH films on transparent conductive oxides

Di Girolamo D.
Validation
;
Piccinni, Marco;Marrani A. G.;Zanoni R.;Dini D.
Methodology
2019

Abstract

Electrodeposition of NiOOH is an attracting route toward nanosized films of NiO, a p-type semiconductor used in many advanced applications. In this paper, the deposition mechanism is thoroughly investigated aiming at the clarification of the deposition dynamics and the chemical nature of the deposit. We focused on initial stages of the potentiostatic deposition on ITO, which yields a nanostructured film. In the potential range investigated the process is mass transport controlled and strongly overlaps with oxygen evolution reaction. The nucleation regime, which is finely tunable, correlates with the surface extension of the film. Supporting electrolytes are found to suppress the deposition, likely by modifying the nickel speciation in the aqueous electrolyte. Further, through XPS investigation we shed light on the mixed γ−β NiOOH nature of the deposited film and its electrochemistry. This work provides precious understanding for future exploitations of anodic electrodeposited NiO, especially in applications where a strict control on surface morphology and thickness at the nanoscale level is mandatory.
2019
electrodeposition; nickel oxide; nucleation-growth modelling; photoemission spectroscopy; transparent conductive oxides
01 Pubblicazione su rivista::01a Articolo in rivista
Investigating the electrodeposition mechanism of anodically grown NiOOH films on transparent conductive oxides / Di Girolamo, D.; Piccinni, Marco; Matteocci, F.; Marrani, A. G.; Zanoni, R.; Dini, D.. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 319:(2019), pp. 175-184. [10.1016/j.electacta.2019.06.170]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1298145
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