Electrochemical Behavior of Ni–Mo Electrocatalyst for Water Electrolysis
Suilma Marisela Fernández–Valverde,1* Eduardo Ordoñez–Regil,1 Gerardo Cabañas–Moreno2 and Omar Solorza–Feria3
1 Gerencia de Ciencias Básicas, Departamento Química, Instituto Nacional de Investigaciones Nucleares. A. Postal 18–1027, 11870 México D.F. México suilma.fernandez@nutlear.inin.mx.
2 Centro de Nanociencias y Micro y Nanotecnologías del Instituto Politécnico Nacional, A. P. 75–874, 07300 México D.F. México.
3 Departamento Química, Centro de Investigación y de Estudios Avanzados, Instituto Politécnico Nacional, A. P. 14–740, 07000 México D.F. México
]]> Received March 9, 2010
Abstract
Nickel–molybdenum based electrolcatalysts were synthesized in organic media for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media. The strutture, morphology, and chemical composition of the catalysts were evaluated by XRD, SEM and AAS. Results revealed nanocristalline powder materials with Ni0.006Mo, Ni0.1Mo, and NiMo compositions. The best performance for HER, was obtained on Ni0.1Mo electrode, whereas NiMo was for the OER. Results suggest that the material with 1: 1 stoichiometric ratio could be considered as a promising electrocatalyst for OER. This nanotrystalline powder is formed by Ni2Mo3O8 and a crystalline structure attributed to the possible formation of a NiMo cluster, becomes NiMoO4 after thermal treatment at 1073K in air. The NiMo 1:1 cluster catalyst presented electrochemical stability during the OER.
Keywords: NiMo materials, organic chemital synthesis, electrochemical properties, hydrogen evolution reaction, oxygen evolution reaction.
Resumen
Electrocatalizadores base níquel–molibdeno fueron sintetizados en medio orgánico para la reacción de evolución de hidrógeno (HER) y reacción de evolución de oxígeno (OER) en medio alcalino. La estructura, morfología y composición química de los catalizadores fueron evaluados por XRD, SEM y AAS. Los resultados obtenidos mostraron polvos de materiales nanocristalinos con composición química de Ni0.006Mo, Ni0.1Mo y NiMo. El mejor desempeño para la HER fue en electrodos de Ni0.1Mo, y para la OER en NiMo, sugiriendo que el NiMo puede ser considerado como el mas prometedor para OER. El NiMo está compuesto de Ni2Mo3O8 y un cluster de NiMo que se transforma en NiMoO4 después de un tratamiento térmico a 1073K en aire. El catalizador NiMo 1:1 mostró estabilidad electroquímica durante la OER.
Palabras clave: Materiales NiMo, Síntesis química, propiedades electroquímicas, reacción de evolución de hidrógeno, reacción de evolución de oxígeno.
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Acknowledgments
The authors thank Letitia Carapia for is aide with the RDX patterns, S Citalán for the electrochemical measurements of the thermally treated NiMo. This work is part of the ININ projetc of materials for hydrogen production and storage.
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