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4 results on '"González Nava, C."'

2. Electrocatalytic urea mineralization in aqueous alkaline medium using NiIIcyclam-modified nanoparticulate TiO2 anodes and its relationship with the simultaneous electrogeneration of H2 on Pt counterelectrodes

Author

Murcio Hernández, S., Rueda Solorio, A.V., Banda Alemán, J.A., González Nava, C., Rodríguez, F.J., Bustos, E., Espejel Ayala, F., Rodríguez, A., Sepúlveda, S., Manríquez, J., Murcio Hernández, S., Rueda Solorio, A.V., Banda Alemán, J.A., González Nava, C., Rodríguez, F.J., Bustos, E., Espejel Ayala, F., Rodríguez, A., Sepúlveda, S., and Manríquez, J.

Abstract

NiIIcyclam-modified nanoparticulate TiO2-coated ITO electrodes (ITO/TiO2//NiIIcyclam) were prepared by electropolymerization of NiIIcyclam monomers to TiO2-coated ITO electrodes (ITO/TiO2) to improve electrocatalytic urea CO(NH2)2 oxidation in alkaline aqueous solutions. A high value adding secondary effect was the collection of electrons at Pt cathodes, to simultaneously generate H2 from water reduction. NiIIcyclam-modified ITO electrodes (ITO//NiIIcyclam) were also prepared by electropolymerization of NiIIcyclam monomers to bare ITO electrodes (ITO) for comparison purposes. In the presence of the TiO2 nanoparticles, the urea mineralization on NiIIcyclam coatings was doubled (23.95% – organic carbon removal at 120 min of electrolysis) compared to those without TiO2 nanoparticles (13.02% – organic carbon removal at 120 min of electrolysis). In agreement, the faradaic efficiency for H2 generation at the Pt cathode, electrically connected to an anode having TiO2 nanoparticles (0.99 at 120 min of electrolysis), was also twice as effective than that observed when the same Pt cathode was electrically connected to an anode without TiO2 nanoparticles (0.46 at 120 min of electrolysis). The experimental results indicated that the poisoning of NiII centers (which is caused by an excessive production of CO intermediates during the urea oxidation on both NiIIcyclam-modified anodes) was strongly inhibited in the presence of the nanoparticulate TiO2|NiIIcyclam junction. A final comparison between our results and those reported in selected publications revealed that the NiIIcyclam-modified nanoparticulate TiO2-coated ITO anodes here developed, constitutes a promising electrocatalytic system for performing direct urea mineralization at a relative short electrolysis time. Furthermore, the combination of the following phenomena: (a) effective charge separation on the semiconducting ITO|nanoparticulate TiO2 junctions, (b) remarkable capabilities of the nanoporous TiO2 films for tuning

Published
2020

3. Electrocatalytic urea mineralization in aqueous alkaline medium using Ni II cyclam-modified nanoparticulate TiO 2 anodes and its relationship with the simultaneous electrogeneration of H 2 on Pt counterelectrodes

Author

Murcio Hernández, S., Rueda Solorio, A.V., Banda Alemán, J.A., González Nava, C., Rodríguez, F.J., Bustos, E., Espejel Ayala, F., Rodríguez, A., Sepúlveda, S., Manríquez, J., Murcio Hernández, S., Rueda Solorio, A.V., Banda Alemán, J.A., González Nava, C., Rodríguez, F.J., Bustos, E., Espejel Ayala, F., Rodríguez, A., Sepúlveda, S., and Manríquez, J.

Published
2017

4. Study of different carbon materials for their use as bioanodes in microbial fuel cells.

Author

González-Nava C, Godínez LA, Chávez AU, Cercado B, Arriaga LG, and Rodríguez-Valadez FJ

Subjects
Electrodes, Microscopy, Electron, Scanning, Time Factors, Bioelectric Energy Sources, Biofilms, Carbon analysis
Abstract

Microbial fuel cells (MFCs) are capable of removing the organic matter contained in water while generating a certain amount of electrical power at the same time. One of the most important aspects in the operation of MFCs is the formation of biofilms on the anode. Here, we report the characterization of different carbon electrodes and biofilm using a rapid and easy methodology for the growth of biofilms. The biofilms were developed and generated a voltage in less than 4 days, obtaining a maximum of 0.3 V in the cells. Scanning electron microscopy images revealed that growth of the biofilm was only on the surface of the electrode, and consequently both carbon cloth Electrochem and carbon cloth Roe materials showed a greater quantity of volatile solids on the surface of the anode and power density. The results suggested that the best support was carbon cloth Electrochem because it generated a power density of 13.4 mW/m(2) and required only a few hours for the formation of the biofilm.

Published
2016
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