Electrochemical cycling durability of platinum overlayers formed by self-terminating electrodeposition

Agrawal, K and Santhanam, V (2023) Electrochemical cycling durability of platinum overlayers formed by self-terminating electrodeposition. In: International Journal of Hydrogen Energy .

PDF Int_jou_hyd_ene_51_2024.pdf - Published Version Restricted to Registered users only Download (5MB) | Request a copy

Abstract

Platinum thin films comprising nominally 1 to 20 atomic overlayers were formed on a gold-coated substrate using the self-terminating electrodeposition (STED) method. The platinum overlayer loading and morphology were characterized using X-ray Photoelectron Spectroscopy (XPS), Inductively Coupled Plasma � Optical Emission Spectroscopy (ICP-OES), Field Emission Scanning Electron Microscopy (FESEM), Cyclic Voltammetry (CV) and Chronoamperometry (CA). The durability of these platinum overlayer samples was estimated by subjecting the samples to ex-situ electrochemical potential cycling. The extent of platinum overlayer growth is lower than expected till four STED cycles and then increases non-linearly, leading to increased roughness. The shifts of platinum redox peaks in CVs and Pt4f signals in XPS spectra indicate surface-alloying of gold and platinum. After the durability test, the morphological evolution of platinum overlayers conforms with the extent of platinum dissolution estimated from CVs. Our results reveal that more than four STED cycles are needed to form platinum overlayers that meet the US Department of Energy (DOE) criteria for durability. © 2023 Hydrogen Energy Publications LLC

Item Type:	Journal Article
Publication:	International Journal of Hydrogen Energy
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Chronoamperometry; Cyclic voltammetry; Durability; Electrocatalysts; Electrodeposition; Electrodes; Enamels; Field emission microscopes; Gold coatings; Inductively coupled plasma; Morphology; Optical emission spectroscopy; Scanning electron microscopy; X ray photoelectron spectroscopy, Durability test; Electrochemical cycling; Ex situ; Ex-situ durability test; Gold coated substrate; Nonlinear growth; Overlayers; Platinum atomic overlayer; Platinum thin film; Self-terminating electrodeposition, Platinum
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	04 Mar 2024 09:22
Last Modified:	04 Mar 2024 09:22
URI:	https://eprints.iisc.ac.in/id/eprint/84329

Actions (login required)

View Item