Jimena Castro-Gutiérrez

University of Lorraine | UdL · Institut Jean Lamour

To provide a comprehensive description of hierarchical pore networks and optimize micro-mesoporous materials, it is essential to consider pore connectivity as a parameter. This study introduces an innovative hierarchy-connectivity factor (HCF) that includes the volume, size, and connectivity data of pores within the pore network. This study covers...

Encapsulating Fe3C in carbon layers has emerged as an innovative strategy for protecting Fe3C while preserving its high oxygen reduction activity. However, fundamental questions persist regarding the active sites of encapsulated Fe3C due to the restricted accessibility of oxygen molecules to the metal sites. Herein, the intrinsic electron transfer...

This study demonstrates that ammonia concentration when doping carbons using hydrothermal treatment has crucial impact on textural properties. The latter translates into an improvement of the electrochemical performance of carbon materials, when used into electrochemical capacitors, especially at high-rate performance. Nitrogen-doped carbons were s...

Carbon xerogels (CX) with varying nodule sizes, from 50 nm to 2 μm, are synthesized via polycondensation of resorcinol with formaldehyde in water, followed by pyrolysis at 800 ◦C to investigate their electrochemical properties as negative electrode material in Na-ion batteries. All samples exhibit high specific surface areas (~600 m2 g-1 by N2 phys...

In this study, we systematically study the efficient production method and electrochemical characteristics of activated carbons (AC) derived from rice husk (RH) and walnut shell (WS). In particular, the effectiveness of physical activation using carbon dioxide (CO2) was investigated and compared with the more common chemical activation method using...

In this study, efficient electrodes for the hydrogen evolution reaction (HER) based on low-cost and metal-free carbon catalysts are presented. Phytic acid, a biosourced molecule containing carbon (C) and phosphorus (P), was found to be an excellent precursor for producing carbon materials with high P content, depending on the carbonization temperat...

The sluggish kinetics and high overpotential of the oxygen reduction reaction (ORR) in fuel cells and metal–air batteries are currently resolved through the use of expensive and scarce platinum-based electrocatalysts. Here, a green and straightforward synthesis method for preparing metal-free phosphorus-doped carbon (PDC) materials via carbonizatio...

Although high-surface area activated carbons used as supercapacitor (SC) electrodes are frequently produced by KOH activation, this study shows that, when aqueous electrolytes are used, CO 2 activation is a better choice from the point of view of SC performance, environment and economy. Ordered mesoporous carbons (OMCs) produced by a mechanochemica...

A surfactant-water-assisted mechanochemical mesostructuration method is used to produce model carbon materials with a disordered or ordered mesoporous structure (DMCs or OMCs, respectively) from a sustainable precursor, mimosa tannin. These model materials, differing only in their mesoporous structure, allow assessing the importance of the connecti...

Two micro-mesoporous carbons (MMCs): a disordered mesoporous carbon (DMC) and an ordered mesoporous carbon (OMC), synthesized by an easy, low-cost, and green method are proposed as efficient hydrocarbon sieves for the separation of C6 isomers: n-hexane (nHEX), 2-methylpenthane (2MP) and 2,2-dimethylbutane (22DMB). Their textural characterization re...

Mesoporous carbonaceous materials were functionalized with iron or copper by a mechanochemical approach. The structural and textural properties of these catalysts were characterized by N2 physisorption, transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The synthesized materials were evaluated in the transformation reac...

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Supercapacitors (SCs) are energy storage devices that bridge the gap between batteries and conventional capacitors. They can store more energy than capacitors and supply it at higher power outputs than batteries. These features, combined with high cyclability and long-term stability, make SCs attractive devices for energy storage. SCs are already p...

The electromagnetic properties of various carbon gels, produced with different bulk densities, were investigated in a wide frequency range (20 Hz–36 GHz). The values of dielectric permittivity and electrical conductivity at 129 Hz were found to be very high, i.e., more than 105 and close to 100 S/m, respectively. Both strongly decreased with freque...

The electromagnetic properties of various carbon gels, produced with different bulk densities, were investigated in a wide frequency range (20 Hz-36 GHz). The values of dielectric permittivity and electrical conductivity at 129 Hz were found to be very high, i.e., more than 10⁵ and close to 100 S/m, respectively. Both strongly decreased with freque...

COVER PAGE of ACS Sustainable Chem. Eng.

Ordered mesoporous carbons (OMCs) are produced by an easy, fast and green surfactant-water-assisted mechanochemical mesostructuration (SWAMM) method, using only tannin, water and Pluronic® F127 as raw materials. OMCs are physically activated with CO2 to increase their surface area from ~500 m2 g-1 to ~2000 m2 g-1 while maintaining the mesoporosity...

A simple, green, one-pot mechanosynthesis method for preparing perfectly ordered mesoporous carbons (OMCs) by ball-milling is presented herein. Mimosa tannin (T) and Pluronic® F127 (P) are used as carbon precursor and as mesopore-directing agent, respectively. Water (W) is used to promote micelles formation but also the interaction between T and P;...

A simple, green, one-pot mechanosynthesis method for preparing perfectly ordered mesoporous carbons (OMCs) by ball-milling is presented herein. Mimosa tannin (T) and Pluronic® F127 (P) are used as carbon precursor and as mesopore-directing agent, respectively. Water (W) is used to promote micelles formation but also the interaction between T and P;...

Resumen Habitualmente los cursos de termodinámica abordan el tema de la refrigeración de manera teórica utilizando el ciclo inverso de Carnot, esto deja al estudiante con una idea muy abstracta y poco tangible. En el presente trabajo se realiza un análisis de los sistemas reales de refrigeración, lo cual permite que, al estudiar cada componente, se...