Highly porous Ti-Ni anodes for electrochemical oxidations
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Highly porous Ti-Ni anodes for electrochemical oxidationsAutoria
Tutor/Supervisor; Universitat.Departament
Guerrero Castillejo, Antonio; Universitat Jaume I. Departament de FísicaData de publicació
2020-09-28Editor
Universitat Jaume IResum
The hydrogen rising economy is demanding an active and durable electrocatalysts
based on low-cost, earth abundant materials for water electrolysis. Oxygen
electrochemistry plays a key role in renewable energy ... [+]
The hydrogen rising economy is demanding an active and durable electrocatalysts
based on low-cost, earth abundant materials for water electrolysis. Oxygen
electrochemistry plays a key role in renewable energy technologies, but the slow
kinetics of oxygen evolution reaction limit the performance and commercialization
such as devices. Nonetheless, most of the previous work has been focus on precious
metals and there are no guidelines for the choice of oxides as evolving oxygen
electrodes. Up to now, iridium dioxide and ruthenium dioxide are the state-of-theart oxygen evolution reaction electrocatalysts with low overpotential and Tafel
slope. This work describes a general method to obtain highly porous electrodes and
their use as dimensionally stable anodes for the O2 evolution reaction (OER). By
using a powder metallurgy based process, where metallic titanium and nickel
powders are pressed and thermally treated, we obtain electrodes that benefit from a
1000-fold increase in the electrochemical surface area (ECSA). In addition, active
catalytic species for water oxidation (i.e. NiOOH) are generated during the
processing converting these electrodes as ideal candidates for evaluation in oxidation
reactions. Excellent OER performance is obtained with overpotentials below 270
mV at 10 mA cm−2, exceeding those of commercially available alternatives. The
current work paves the way for a generic method that will be extended to other
electrochemical reactions. [-]
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Descripció
Treball Final de Màster Universitari en Química Sostenible (Pla de 2015). Codi: SJE020. Curs acadèmic: 2019/2020
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