Electrocatalytic Promotion of Pt Nanoparticles by Incorporation of Ni(OH)2 for Glycerol Electro‐Oxidation: Analysis of Activity and Reaction Pathway

ChemNanoMat - Tập 5 Số 1 - Trang 68-78 - 2019
Isaac Velázquez‐Hernández1, Mercedes Teresita Oropeza-Guzmán2, Minerva Guerra‒Balcázar3, Lorena Álvarez‒Contreras4, Noé Arjona1
1Centro de Investigación y Desarrollo Tecnológico en Electroquímica S.C., Querétaro C. P. 76703 México
2Tecnológico Nacional de México Instituto Tecnológico de Tijuana, Apdo. Postal 1166, Tijuana, Baja California México C.P. 22000
3División de Investigación y Posgrado, Facultad de Ingeniería Universidad Autónoma de Querétaro Querétaro México C.P. 76010
4Centro de Investigación en Materiales Avanzados S. C., Miguel de Cervantes 120 Complejo Industrial Chihuahua Chihuahua México C.P. 31136

Tóm tắt

AbstractIn this work, the effect of Pt−Ni(OH)2 nanoparticles on the activity and reaction pathway of glycerol oxidation was studied. For this purpose, small Pt (4±0.2 nm) and Pt−Ni(OH)2 nanoparticles (4.7±0.4 nm) supported on Vulcan carbon were synthesized. Ni(OH)2 were found in the vicinity of Pt modifying the lattice parameter, inter‐planar distance and binding energy of Pt. Electrochemical evaluation indicated that Pt−Ni(OH)2/C had better electrocatalytic activity than Pt/C offering a higher current density (almost 45 mA mg−1), and lower onset (−0.3 V) and oxidation peak potentials (0.04 V). The improved activity was associated to the OH groups found in the vicinity of Pt active sites, facilitating the charge transfer due to a bifunctional mechanism. The in situ evaluation confirmed that the incorporation of Ni(OH)2 led to higher electron transfer due to short‐chain byproducts such as glycolate, mesoxalate and formate, which were found at the oxidation peak potential.

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ChemNanoMat

Tập 5 Số 1

68-78

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