Abstract
Metallic lead (Pb) has been electrodeposited on FTO substrate at room temperature from aqueous nitrate solution under constant applied potential in the range of − 0.46 to − 0.8 V vs. SCE. Cyclic voltammetry shows that 3D nucleation and growth are the main feature at higher electrolyte concentration when the profile is recorded at 20 mVs−1. While a single step potential facilitates the deposition of faceted crystals of Pb, distinguished lead having cabbage-like morphology can be deposited by applying sequential two step potentials. The I-t response shows that the deposition is initiated through instantaneous 2D nucleation and growth at the shorter time domain followed by 3D nucleation and growth in 0.4 M Pb(NO3)2. Theoretical simulation of the closely matched experimental I-t profile for simple step potential provides a 2D rate constant of 2.00 ± 0.04 × 10−7 mol cm−2 s−1 while for 3D, the vertical and plane growth rate constant of 3.27 ± 0.05 × 10−5 mol cm−2 s−1 and 2.00 ± 0.04 × 10−7 mol cm−2 s−1, respectively. The formation of the cabbage morphology has been discussed on the basis of time evaluation of FE-SEM. The high surface area of unique lead deposits with cabbage morphology shows better life time and oxygen sensitivity in a typical oxygen sensor application.
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The authors would like to acknowledge Solar Research & Development Centre (SRDC), Pandit Deendayal Petroleum University (PDPU), for providing the technical and financial assistance.
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Financial support from the Department of Science and Technology (DST), Government of India, (Project number SR/S1/PC-44/2011), is deeply acknowledged to carry out this whole investigation.
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Bhagat, D., Waldiya, M. & Mukhopadhyay, I. Electrochemical deposition of cabbage-like lead microstructures on fluorine-doped tin oxide for oxygen sensor application. J Solid State Electrochem 23, 159–167 (2019). https://doi.org/10.1007/s10008-018-4110-0
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DOI: https://doi.org/10.1007/s10008-018-4110-0