Defect engineering on metal oxides (Zn, Mo and Fe) and their impact on the crude glycerol biofuel oxidation
Por:
Velázquez-Hernández I., Olivas A., Bañuelos J.A., Ramos-Castillo C.M., Álvarez-Contreras L., Guerra-Balcázar M., Arjona N.
Publicada:
1 ene 2024
Ahead of Print:
1 dic 2023
Resumen:
Defect engineering is an interesting area to improve the activity for alcohols oxidation because it promotes electronic changes through induced defects like oxygen vacancies (Ov) or doping with heteroatoms. Herein, Pd/Ov?induced metal oxides bimetallic nanomaterials (Pd/Ov?Fe2O3, Pd/Ov?ZnO and Pd/Ov?MoO3) were successfully synthesized and defect?engineered boosting oxygen vacancies in the order ~9–15%. The resulting materials had similar crystallite sizes (~7.1 nm), metal?support compositions (~20 wt %), and bimetallic compositions (metal oxide ~20 wt %). Electrochemical tests demonstrated that despite ZnO presented improved Ov, the electronic interaction between Pd and Ov?Fe2O3 allowed to obtain higher current density (jmax). Pd/Ov?Fe2O3 presented a jmax of 197.66 mA mg-1, being up to 2.2 times higher to that of Pd/C, while Pd/Ov?MoO3 presented the most negative onset potential (-0.30 V). Electrochemical impedance spectroscopy, apparent activation energy tests and cyclic voltammetry tests involving synthetic solutions of glycerol, methanol and glyceraldehyde confirmed that the decrease of the onset potential is related to an enhanced electron transfer by Pd/Ov?MoO3 resulting also in a decrease of the apparent activation energy (11.22 kJ mol-1). While the improved jmax of Pd/Ov?Fe2O3 was related to its capability to oxidize crude glycerol and the mixtures because the efficient interaction between the defected metal oxide and palladium. © 2023 Hydrogen Energy Publications LLC
Filiaciones:
Velázquez-Hernández I.:
Centro de Investigación y Desarrollo Tecnológico en Electroquímica S. C., Sanfandila, Pedro Escobedo, Querétaro, C. P. 76703, Mexico
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Olivas A.:
Centro de Nanociencias y Nanotecnología-UNAM, Km. 107 Carretera Tijuana-Ensenada, Ensenada B.C., C.P. 22800, Mexico
Bañuelos J.A.:
Instituto Mexicano de Tecnología del Agua, Jiutepec Morelos, C. P. 62550, Mexico
Ramos-Castillo C.M.:
Facultad de Ingeniería, División de Investigación y Posgrado, Universidad Autónoma de Querétaro, Querétaro, C. P. 76010, Mexico
Álvarez-Contreras L.:
Centro de Investigación en Materiales Avanzados S. C., Complejo Industrial Chihuahua, Chihuahua, C. P. 31136, Mexico
Guerra-Balcázar M.:
Facultad de Ingeniería, División de Investigación y Posgrado, Universidad Autónoma de Querétaro, Querétaro, C. P. 76010, Mexico
Arjona N.:
Centro de Investigación y Desarrollo Tecnológico en Electroquímica S. C., Sanfandila, Pedro Escobedo, Querétaro, C. P. 76703, Mexico
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