Designing materials by means of the cavity-microelectrode : the introduction of the quantitative rapid screening toward a highly efficient catalyst for water oxidation
Articolo
Data di Pubblicazione:
2012
Citazione:
Designing materials by means of the cavity-microelectrode : the introduction of the quantitative rapid screening toward a highly efficient catalyst for water oxidation / A. Minguzzi, C. Locatelli, G. Cappelletti, C.L.M. Bianchi, A. Vertova, S. Ardizzone, S. Rondinini. - In: JOURNAL OF MATERIALS CHEMISTRY. - ISSN 0959-9428. - 22:18(2012), pp. 8896-8902.
Abstract:
In this paper, we introduce the concept and the methodology of quantitative rapid screening (QRS) of
catalysts. It is based on the use of the cavity-microelectrode (C-ME), a tool that hosts a known amount
of powder and can be filled and emptied quickly, thus allowing the quantitative, rapid, fine
characterization of different materials. Here, C-MEs are used for selecting a suitable material to be used
as electrocatalyst for the oxygen evolution reaction (water oxidation) in acidic environment, a key
process for the majority of the industrial electrolytic applications including the production of high
purity hydrogen. A matrix of materials, each having the same low iridium oxide content, is
quantitatively screened for finding the most promising one. C-MEs allowed us to measure the effective
number of active Ir sites and their surface concentration. The success of this strategy is proven by the
good performance of the ‘‘best’’ material when tested in a proton exchange membrane water
electrolyzer, that allowed high hydrogen fluxes at a low cell potential ( 4000 dm3 h 1 m 2 at less
than 1.9 V).
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
scanning electrochemical microscopy; oxygen evolution electrocatalysts; surface interrogation; iridium oxide; formic-acid; electrodes; reduction; PD; electroreduction; electrolysis
Elenco autori:
A. Minguzzi, C. Locatelli, G. Cappelletti, C.L.M. Bianchi, A. Vertova, S. Ardizzone, S. Rondinini
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