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22 results on '"Lobato-Peralta, Diego Ramón"'

8. Synthesis and characterizations of nanocarbon

Author

Universidad Nacional Autónoma de México, Consejo Nacional de Humanidades, Ciencias y Tecnologías (México), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), CSIC - Plataforma Temática Interdisciplinar del CSIC Transición energética (PTI TransEner +), European Commission, Lobato Peralta, Diego Ramón [0000-0003-4534-5195], Ayala Cortés, Alejandro [0000-0003-3933-5820], Okoye, Patrick U. [0000-0003-2974-0582], Lobato Peralta, Diego Ramón [drlp@ier.unam.mx], Lobato Peralta, Diego Ramón, Ayala Cortés, Alejandro, Duque-Brito, Estefanía, Okoye, Patrick U., Universidad Nacional Autónoma de México, Consejo Nacional de Humanidades, Ciencias y Tecnologías (México), Ministerio de Ciencia e Innovación (España), Agencia Estatal de Investigación (España), CSIC - Plataforma Temática Interdisciplinar del CSIC Transición energética (PTI TransEner +), European Commission, Lobato Peralta, Diego Ramón [0000-0003-4534-5195], Ayala Cortés, Alejandro [0000-0003-3933-5820], Okoye, Patrick U. [0000-0003-2974-0582], Lobato Peralta, Diego Ramón [drlp@ier.unam.mx], Lobato Peralta, Diego Ramón, Ayala Cortés, Alejandro, Duque-Brito, Estefanía, and Okoye, Patrick U.

Abstract

Nanocarbons have become increasingly relevant in the field of energy storage due to their diverse properties, which make them suitable for use in a variety of devices such as batteries, supercapacitors, and fuel cells. The properties of carbon-based materials are heavily influenced by the choice of precursor, process conditions, and reactor type used in their synthesis. Thus, understanding the interplay between these factors is crucial for designing carbon-based energy storage materials with tailored performance characteristics. This chapter provides an overview of the latest and traditional technologies used to obtain nanocarbon materials, including innovative approaches like reactors that use concentrated solar energy and traditional methods like tubular furnaces. We also outline the common methodologies used to synthesize diverse nanocarbon materials, such as carbon nanotubes, graphene, and nanoporous carbons. Furthermore, this chapter discusses the techniques commonly used to characterize nanocarbon materials and evaluate their properties. These techniques include surface area measurement, determination of chemical composition, evaluation of the degree of order/disorder, identification of functional groups on the surface, and electrochemical characterization for energy storage applications, among others.

Published
2024

9. Optimizing capacitance performance: Solar pyrolysis of lignocellulosic biomass for homogeneous porosity in carbon production

Author

Universidad Nacional Autónoma de México, Consejo Nacional de Humanidades, Ciencias y Tecnologías (México), Amazon, Lobato Peralta, Diego Ramón [0000-0003-4534-5195], Arreola Ramos, Carlos E. [0000-0003-4770-8340], Ayala Cortés, Alejandro [0000-0003-3933-5820], Pacheco-Catalán, D. [0000-0003-3412-7459], Muñiz Soria, Jesús [0000-0002-7165-0268], Okoye, Patrick U. [0000-0003-2974-0582], Villafán, Heidi Isabel [0000-0002-0798-1361], Arancibia Bulnes, Camilo A. [0000-0001-6782-0116], Cuentas Gallegos, A. K. [0000-0003-4516-8889], Cuentas Gallegos, A. K. [akcg@ens.cnyn.unam.mx], Lobato Peralta, Diego Ramón, Arreola Ramos, Carlos E., Ayala Cortés, Alejandro, Pacheco-Catalán, D., Robles, Miguel, Guillén López, Alfredo, Muñiz Soria, Jesús, Okoye, Patrick U., Villafán, Heidi Isabel, Arancibia Bulnes, Camilo A., Cuentas Gallegos, A. K., Universidad Nacional Autónoma de México, Consejo Nacional de Humanidades, Ciencias y Tecnologías (México), Amazon, Lobato Peralta, Diego Ramón [0000-0003-4534-5195], Arreola Ramos, Carlos E. [0000-0003-4770-8340], Ayala Cortés, Alejandro [0000-0003-3933-5820], Pacheco-Catalán, D. [0000-0003-3412-7459], Muñiz Soria, Jesús [0000-0002-7165-0268], Okoye, Patrick U. [0000-0003-2974-0582], Villafán, Heidi Isabel [0000-0002-0798-1361], Arancibia Bulnes, Camilo A. [0000-0001-6782-0116], Cuentas Gallegos, A. K. [0000-0003-4516-8889], Cuentas Gallegos, A. K. [akcg@ens.cnyn.unam.mx], Lobato Peralta, Diego Ramón, Arreola Ramos, Carlos E., Ayala Cortés, Alejandro, Pacheco-Catalán, D., Robles, Miguel, Guillén López, Alfredo, Muñiz Soria, Jesús, Okoye, Patrick U., Villafán, Heidi Isabel, Arancibia Bulnes, Camilo A., and Cuentas Gallegos, A. K.

Abstract

This work compares the effect of using a solar reactor against a conventional electrical furnace to obtain carbon materials by pyrolysis of a lignocellulosic precursor. The solar reactor is directly irradiated and includes modifications to improve the control of the process and the reproducibility of solar experiments. A bagasse of agave creole was selected as the lignocellulosic precursor or biomass to obtain carbon materials at temperatures of 700 °C. Comparing carbons produced by conventional and solar pyrolysis, higher crystallinity and lower hydrophilicity are evident in the former. Moreover, conventional pyrolysis tends to promote a more homogeneous porous structure in comparison to solar pyrolysis. However, within the spectrum of solar carbons produced, the morphology of biomass plays a crucial role in influencing the chemical composition and porosity properties. Specifically, the use of fibers instead of powders to produce carbons through solar pyrolysis results in a more homogeneous porosity, attributed to an enhanced volumetric absorption of solar radiation. This modification leads to a significant improvement in capacitance, increasing from 125 F/g to 175 F/g at 5 mV/s in aqueous electrolytes. The carbons from the solar furnace are reproducible, underlying the potential of the proposed process towards a sustainable alternative. To achieve a theoretical reference, the pyrolysis process was mimic trough Reactive Molecular Dynamics calculations modeling the initial structural conditions of agave biomass with its corresponding lignocellulosic components and considering analogous thermal conditions. The resulting carbon structures at the end of the simulations showed structural properties that are consistent with those observed in the pair distribution functions obtained from XRD and the pore size distribution from physisorption analyses. This combined experimental–theoretical approach offers the potential to elucidate porous carbon structures derived from pyr

Published
2024

10. Supplementary information for Optimizing capacitance performance: Solar pyrolysis of lignocellulosic biomass for homogeneous porosity in carbon production [Dataset]

Author

Universidad Nacional Autónoma de México, Consejo Nacional de Humanidades, Ciencias y Tecnologías (México), Amazon, Lobato Peralta, Diego Ramón [0000-0003-4534-5195], Arreola Ramos, Carlos E. [0000-0003-4770-8340], Ayala Cortés, Alejandro [0000-0003-3933-5820], Pacheco-Catalán, D. [0000-0003-3412-7459], Muñiz Soria, Jesús [0000-0002-7165-0268], Okoye, Patrick U. [0000-0003-2974-0582], Villafán, Heidi Isabel [0000-0002-0798-1361], Arancibia Bulnes, Camilo A. [0000-0001-6782-0116], Cuentas Gallegos, A. K. [0000-0003-4516-8889], Cuentas Gallegos, A. K. [akcg@ens.cnyn.unam.mx], Lobato Peralta, Diego Ramón, Arreola Ramos, Carlos E., Ayala Cortés, Alejandro, Pacheco-Catalán, D., Robles, Miguel, Guillén López, Alfredo, Muñiz Soria, Jesús, Okoye, Patrick U., Villafán, Heidi Isabel, Arancibia Bulnes, Camilo A., Cuentas Gallegos, A. K., Universidad Nacional Autónoma de México, Consejo Nacional de Humanidades, Ciencias y Tecnologías (México), Amazon, Lobato Peralta, Diego Ramón [0000-0003-4534-5195], Arreola Ramos, Carlos E. [0000-0003-4770-8340], Ayala Cortés, Alejandro [0000-0003-3933-5820], Pacheco-Catalán, D. [0000-0003-3412-7459], Muñiz Soria, Jesús [0000-0002-7165-0268], Okoye, Patrick U. [0000-0003-2974-0582], Villafán, Heidi Isabel [0000-0002-0798-1361], Arancibia Bulnes, Camilo A. [0000-0001-6782-0116], Cuentas Gallegos, A. K. [0000-0003-4516-8889], Cuentas Gallegos, A. K. [akcg@ens.cnyn.unam.mx], Lobato Peralta, Diego Ramón, Arreola Ramos, Carlos E., Ayala Cortés, Alejandro, Pacheco-Catalán, D., Robles, Miguel, Guillén López, Alfredo, Muñiz Soria, Jesús, Okoye, Patrick U., Villafán, Heidi Isabel, Arancibia Bulnes, Camilo A., and Cuentas Gallegos, A. K.

Abstract

A full description of computational details related to molecular dynamics, radial distribution function computation, and Envelope Density assessment, along with experimental results concerning SEM images of group I and group II carbon materials.-- S0.1. Computational Details: S0.1.1. Simulations with Molecular Dynamics. S0.1.2. Radial distribution function computation. S0.1.3. Envelope Density assessment. S0.2. Complementary experimental results

Published
2024

19. Electrochemical hydrogen storage in high surface area microporous carbon from disposable diaper waste.

Author

Giovanni-Mondragón, César, Lobato-Peralta, Diego Ramón, Okolie, Jude A., Arias, D.M., Orugba, Henry O., Sebastian, P.J., and Okoye, Patrick U.

Subjects
*HYDROGEN storage, *SURFACE area, *ELECTRIC double layer, *ACTIVATED carbon, *DIAPERS, *SUPERABSORBENT polymers
Abstract

The superabsorbent polymer (SAP) of the disposable diaper, which could serve as a substrate for pathogen growth, was valorized into nanostructured carbon through chemical activation for electrochemical hydrogen storage. The Box-Behnken experimental design was employed to elucidate the effects of activation conditions. Optimization results show that activation temperature and KOH:SAPC molar ratio had a greater impact on the textural and morphological characteristics of the nano-activated carbon. The best electrode material exhibited a surface area of 2552 m2/g, a total pore volume of 1.28 cm³/g, a total micropore volume of 0.871 cm³/g, and a pore size of 1.32 nm. The galvanostatic charge/discharge curves indicate that only higher current densities of 1 and 2 A/g could achieve a faster release of stored hydrogen in approximately 4 min. The best material stored hydrogen mainly through the electric double-layer mechanism, and the specific capacity reached 1878 mAh/g (6.60 wt% of H 2), which ranks among the best-reported hydrogen storage capacities with activated carbon. • Diaper waste was used as a sustainable precursor to prepare activated carbon. • Abundant micropores and high surface area allowed high hydrogen storage capacity. • Higher current density achieved faster release of adsorbed hydrogen atoms. • The mechanism of hydrogen storage is mainly electric double layer. [ABSTRACT FROM AUTHOR]

Published
2024
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20. A review on carbon materials for electrochemical energy storage applications: State of the art, implementation, and synergy with metallic compounds for supercapacitor and battery electrodes.

Author

Lobato-Peralta, Diego Ramón, Okoye, Patrick U., and Alegre, Cinthia

Subjects
*CARBON-based materials, *ENERGY storage, *CARBON electrodes, *ELECTRIC conductivity, *CHEMICAL stability, *SUPERCAPACITOR electrodes
Abstract

Carbon materials play a fundamental role in electrochemical energy storage due to their appealing properties, including low cost, high availability, low environmental impact, surface functional groups, high electrical conductivity, alongside thermal, mechanical, and chemical stability, among other factors. Currently, carbon materials can be considered the most extensively explored family in the field of supercapacitors and batteries, which are devices covering a wide range of applications demanding high power and high energy. However, as with all technologies, there is a process of adaptation and optimization; hence, carbon materials have been aligning with the advances that emerge. Similarly, over the years, new methods and processes have been discovered to produce carbons more suitable for energy storage, adapting them to present a good synergy with metal-based compounds to meet current standards. In this work, we present a compilation of advances in the field of carbon materials used in supercapacitors and batteries, from the inception of these technologies to the present day. [Display omitted] • Carbon materials play a critical role in the field of energy storage. • Supercapacitors and batteries utilize carbon as electrode materials. • The properties of carbon allow it to be used in a wide range of conditions. • Biomass-derived carbons can be considered sustainable materials. • Future research is focused on enhancing the properties of carbon materials. [ABSTRACT FROM AUTHOR]

Published
2024
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