Loading…

Kinetic study and growth behavior of template-based electrodeposited platinum nanotubes controlled by overpotential

Platinum nanotubes (PtNTs) are fabricated by potentiostatic electrodeposition at various overpotentials (−200 up to −400 mV versus SCE) in polycarbonate templates (PCTs) with pore diameter of 200 nm in a solution containing 5 mM H2PtCl6 and 0.1 M H2SO4. The synthesized PtNTs are characterized by fie...

Full description

Saved in:
Bibliographic Details
Published in:Materials chemistry and physics 2017-02, Vol.187, p.141-148
Main Authors: Yousefi, E., Dolati, A., Imanieh, I., Yashiro, H., Kure-Chu, S.-Z.
Format: Article
Language:English
Subjects:
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Platinum nanotubes (PtNTs) are fabricated by potentiostatic electrodeposition at various overpotentials (−200 up to −400 mV versus SCE) in polycarbonate templates (PCTs) with pore diameter of 200 nm in a solution containing 5 mM H2PtCl6 and 0.1 M H2SO4. The synthesized PtNTs are characterized by field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The electrochemical growth mechanism within nanoscopic pores and the relationship between morphological variations and kinetic parameters are investigated for the first time. It is shown that more porous structure of nanotubes forms at high overpotentials possibly due to preferably nucleation. The kinetics of electrodeposition process is studied by electrochemical techniques such as voltammetry and chronoamperometry. The linear diffusion coefficient at the early stage of the deposition and the radial diffusion coefficients at steady state regime are calculated as D = 8.39 × 10−5 and 2.33–13.26 × 10−8 cm2/s, respectively. The synthesized PtNT electrode is tested as electrocatalyst for hydrogen peroxide oxidation in phosphate buffer solution (PBS) and shows a sensitivity as high as 2.89 mA per 1 μM that is an indication to its enlarged electrochemical surface area. •PtNT is electrodeposited in a 3-aminopropyltrimethoxysilane-modified PCT.•The electrochemical growth mechanism within nanoscopic pores is discussed.•The kinetics of PtNT electrodeposition is studied based on models for UME arrays.•Relationship between morphological variations vs. kinetic parameters is studied.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2016.11.058