Metallic multilayered films electrodeposited over titanium as catalysts for methanol electro-oxidation

Zulke, Alana A. and Matos, Roberto and Pereira, Ernesto C. (2013) Metallic multilayered films electrodeposited over titanium as catalysts for methanol electro-oxidation. Electrochimica Acta, 105. pp. 578-583. ISSN 0013-4686

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Abstract

Multilayered Pt/Ir/Pt films were electrodeposited over titanium substrates, controlling the film thickness by the deposition charge. Two probe molecules were used to perform the evaluation of catalytic activity, CH3OH and CO. Using a 22 factorial design with a central point, optimized intrinsic catalytic activity was obtained over the Ti/Pt25mC/Ir6mC/Pt electrode. An enhancement of the current density of up to 2.76 times was observed for the methanol oxidation reaction (MOR) compared with the reference sample (Ti/Pt electrodes), even though both samples had the same electroactive area. In addition to the methanol oxidation voltammetry, CO stripping voltammetry suggests that MM-like systems are less susceptible to the catalyst-poisoning phenomenon compared to the Ti/Pt ones. Impedance spectroscopy was mainly used to monitor the charge transference resistance (Rct), whose results showed a clear Rct reduction for the MOR process over MMs compared with Ti/Pt electrodes, corroborating the previous observations regarding the general catalytic improvement.

Item Type:
Journal Article
Journal or Publication Title:
Electrochimica Acta
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1600/1603
Subjects:
ID Code:
136943
Deposited By:
Deposited On:
24 Sep 2019 10:55
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2020 09:43