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Open AccessArticle
Para-Hydroxy Ni(II)-POCOP Pincer Complexes as Modifiers on Carbon Paste Electrodes and Their Application in Methanol Electro-Oxidation in Alkaline Media
by
Fabiola Hernández-García
Fabiola Hernández-García 1,
Arturo T. Sanchez-Mora
Arturo T. Sanchez-Mora 2
,
Juan S. Serrano-García
Juan S. Serrano-García 2
,
Andrés Amaya-Florez
Andrés Amaya-Florez 2
,
Luis A. Ortiz-Frade
Luis A. Ortiz-Frade 3,
Giaan A. Alvarez-Romero
Giaan A. Alvarez-Romero 1,*
,
J. Antonio Cruz-Navarro
J. Antonio Cruz-Navarro
J. Antonio Cruz-Navarro received his BS in industrial chemistry from Universidad Veracruza in 2015. [...]
J. Antonio Cruz-Navarro received his BS in industrial chemistry from Universidad Veracruza in 2015. Later, he worked for several years as an R&D Jr. manager in the chemical industry. He completed an MSc in biological processes from the same university, under the supervision of Dr. Raúl Colorado-Peralta in 2019. Afterward, he received a Ph.D. degree in Chemistry from the Autonomous University of Hidalgo State, Mexico, in 2022, under the supervision of Dr. Giaan Arturo Alvarez-Romero. He earned recognition as a member of the National System of Researchers (SNI-candidate level) during the same year. Currently, he has joined Dr. David Morales-Morales Group as a postdoctoral researcher. His research interests are the development of coordination and organometallic complexes with cytotoxic, electrochemical, and catalytic properties.
2,*
and
David Morales-Morales
David Morales-Morales 2,*
1
Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km 4.5, Mineral de la Reforma 42184, Hidalgo, Mexico
2
Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito Exterior s/n, Ciudad de Mexico 04510, Mexico
3
Centro de Investigaciones y Desarrollo Tecnológico en Electroquímica CIDETEQ, Parque Tecnológico Querétaro s/n Sanfandila, Pedro Escobedo 76703, Querétaro, Mexico
*
Authors to whom correspondence should be addressed.
Processes 2024, 12(7), 1466; https://doi.org/10.3390/pr12071466 (registering DOI)
Submission received: 17 April 2024
/
Revised: 8 July 2024
/
Accepted: 10 July 2024
/
Published: 13 July 2024
Abstract
The application of organometallic materials as anodes in fuel cell devices has experienced a notable increase in recent years. However, the use of POCOP pincer complexes remains scarcely explored despite their great relevance in catalysis. Thus, in this work, the electrocatalytic activity to methanol in alkaline media of three Ni(II)-based POCOP pincer complexes—[NiCl{C6H2-4-OH-2,6-(OPiPr2)2}] (a1), [NiCl{C6H2-4-OH-2,6-(OPtBu2)2}] (a2), and [NiCl{C6H2-4-OH-2,6-(OPPh2)2}] (a3)—will be discussed. The complexes were use as modifiers of carbon paste electrodes that were evaluated using cyclic voltammetry considering diverse factors, such as the absence and presence of MeOH, diverse proportions (% w/w) of the complex in the electrode, scan rate, and different MeOH concentrations. Results indicated the presence of a redox pair Ni(II)/Ni(III) with a quasi-reversible behavior in all complexes, the anodic peak currents of which were proportional to the increase in MeOH concentrations (0.05–0.3 mM), and their oxidation potentials varied in the function of the P-substituent in the Ni(II)-POCOPs backbone. Complex a1 exhibited the best current density (429.5 mA cm2 at 0.5 mM) compared to its analogs a2 and a3. The current intensity of all electrodes displays good stability, which remains—with slight changes—up to 100 s. Moreover, a comparison of their catalytic rate constants suggested a great activity in complex a1 (0.52 × 106 cm3 mol−1 s−1) compared to its analogues, implying a great activity in the electro-oxidation of MeOH. Hence, this work opens new opportunities for the electrochemical application of POCOPs complexes for future DMFCs development.
Share and Cite
MDPI and ACS Style
Hernández-García, F.; Sanchez-Mora, A.T.; Serrano-García, J.S.; Amaya-Florez, A.; Ortiz-Frade, L.A.; Alvarez-Romero, G.A.; Cruz-Navarro, J.A.; Morales-Morales, D.
Para-Hydroxy Ni(II)-POCOP Pincer Complexes as Modifiers on Carbon Paste Electrodes and Their Application in Methanol Electro-Oxidation in Alkaline Media. Processes 2024, 12, 1466.
https://doi.org/10.3390/pr12071466
AMA Style
Hernández-García F, Sanchez-Mora AT, Serrano-García JS, Amaya-Florez A, Ortiz-Frade LA, Alvarez-Romero GA, Cruz-Navarro JA, Morales-Morales D.
Para-Hydroxy Ni(II)-POCOP Pincer Complexes as Modifiers on Carbon Paste Electrodes and Their Application in Methanol Electro-Oxidation in Alkaline Media. Processes. 2024; 12(7):1466.
https://doi.org/10.3390/pr12071466
Chicago/Turabian Style
Hernández-García, Fabiola, Arturo T. Sanchez-Mora, Juan S. Serrano-García, Andrés Amaya-Florez, Luis A. Ortiz-Frade, Giaan A. Alvarez-Romero, J. Antonio Cruz-Navarro, and David Morales-Morales.
2024. "Para-Hydroxy Ni(II)-POCOP Pincer Complexes as Modifiers on Carbon Paste Electrodes and Their Application in Methanol Electro-Oxidation in Alkaline Media" Processes 12, no. 7: 1466.
https://doi.org/10.3390/pr12071466
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