Abdelhakim Elmouwahidi

Abdelhakim Elmouwahidi

Universidad de Granada

H-index: 12

Europe-Spain

Professor Information

University

Universidad de Granada

Position

___

Citations(all)

1267

Citations(since 2020)

891

Cited By

797

hIndex(all)

12

hIndex(since 2020)

12

i10Index(all)

14

i10Index(since 2020)

14

Email

University Profile Page

Universidad de Granada

Research & Interests List

Carbon material

Energy storage

Electrocatalysis

Adsorption

Photocatalysis

Top articles of Abdelhakim Elmouwahidi

Size Control of Carbon Xerogel Spheres as Key Factor Governing the H2O2 Selectivity in Metal-Free Bifunctional Electro-Fenton Catalysts for Tetracycline …

Carbon xerogel spheres co-doped with nitrogen and eco-graphene were synthesized using a typical solvothermal method. The results indicate that the incorporation of eco-graphene enhances the electrochemical properties, such as the current density (JK) and the selectivity for the four transferred electrons (n). Additionally, nitrogen doping has a significant effect on the degradation efficiency, varying with the size of the carbon xerogel spheres, which could be attributed to the type of nitrogenous group doped in the carbon material. The degradation efficiency improved in the nanometric spheres (48.3% to 61.6%) but decreased in the micrometric-scale spheres (58.6% to 53.4%). This effect was attributed to the N-functional groups present in each sample, with N-CNS-5 exhibiting a higher percentage of graphitic nitrogen (35.7%) compared to N-CMS-5 (15.3%). These findings highlight the critical role of sphere size in determining the type of N-functional groups present in the sample. leading to enhanced degradation of pollutants as a result of the electro-Fenton process.

Authors

Edgar Fajardo-Puerto,Nerea López-García,Abdelhakim Elmouwahidi,Esther Bailón-García,Francisco Carrasco-Marín,Lilian D Ramírez-Valencia,Agustín F Pérez-Cadenas

Journal

Gels

Published Date

2024/5/1

From nutshells to energy cells: Pioneering supercapacitor electrodes via innovative argan nutshell activated carbon synthesis

In this work, a detailed comprehensive investigation explores the impact of processing methods and chemical activation parameters on the textural properties of a series of activated carbons (ACs) derived from Argan Nut Shell (ANS) residue using KOH. This study aims to develop and optimize high-quality ACs for use as solid-state supercapacitors with superior performance in a 1 M H2SO4 electrolyte. The two-step process (involving ANS carbonization followed by activation) is found to significantly enhance specific surface area and total pore volume compared to a one-step process, reaching values of 2334 m2·g−1 and 1.21 cm3·g−1 versus 1394 m2·g−1 and 0.83 cm3·g−1, respectively. The superior surface area and pore volume results are achieved at a KOH/char mass ratio of 4:1, carbonization temperature of 500 °C, and an activation temperature of 800 °C, reaching 3091 m2·g−1 and 1.52 m3·g−1, respectively …

Authors

Hajar El Ouahabi,Abdelhakim Elmouwahidi,Laura Cano-Casanova,María Ángeles Lillo-Ródenas,Mari Carmen Roman-Martínez,Agustín Francisco Pérez-Cadenas,Esther Bailón-García,Mohamed Shaban,Ghadah M Al-Senani,Mohammed Ouzzine,Mohamed Khaddor

Journal

Journal of Energy Storage

Published Date

2024/3/30

Effect of Manganese and Zinc co-dopants on electrochemical properties of vanadium oxide (V2O5) based electrode: application for supercapacitor

Vanadium oxides have been investigated for their potential use in electrochemical supercapacitors due to their variable oxidation states yielding surface redox. However, its electrochemical performance is limited by its poor electronic and ionic conductivity. In an attempt to improve the electronic conductance and electrochemical performance of V 2 O 5,(Mn, Zn) co-doped V 2 O 5 is investigated.(Mn, Zn)(2, 2) wt% co-doped V 2 O 5 provides the high specific capacitance, it achieves 23.72F/g at a scan rate of 5mV/s, and it is characterized by very low charge transfer resistance (301mΩ). At 2A/g current density, its power density and energy density are about 2520Wkg− 1, and 4.85Whkg− 1 respectively. Because of its good electrochemical performance,(Mn, Zn)(2, 2) wt% co-doped V 2 O 5 has great application prospects in supercapacitors.

Authors

H Ghannam,Z Rossi,S Haloui,A Elmouwahidi,A Aouni,T Tite,M Diani,A Chahboun

Published Date

2024/1/15

Facile Synthesis of Carbon-Based Inks to Develop Metal-Free ORR Electrocatalysts for Electro-Fenton Removal of Amoxicillin

The electro-Fenton process is based on the generation of hydroxyl radicals (OH•) from hydroxide peroxide (H2O2) generated in situ by an oxygen reduction reaction (ORR). Catalysts based on carbon gels have aroused the interest of researchers as ORR catalysts due to their textural, chemical and even electrical properties. In this work, we synthesized metal-free electrocatalysts based on carbon gels doped with graphene oxide, which were conformed to a working electrode. The catalysts were prepared from organic-gel-based inks using painted (brush) and screen-printed methods free of binders. These new methods of electrode preparation were compared with the conventional pasted method on graphite supports using a binder. All these materials were tested for the electro-Fenton degradation of amoxicillin using a homemade magnetite coated with carbon (Fe3O4/C) as a Fenton catalyst. All catalysts showed very good behavior, but the one prepared by ink painting (brush) was the best one. The degradation of amoxicillin was close to 90% under optimal conditions ([Fe3O4/C] = 100 mg L−1, −0.55 V) with the catalyst prepared using the painted method with a brush, which had 14.59 mA cm−2 as JK and a H2O2 electrogeneration close to 100% at the optimal voltage. These results show that carbon-gel-based electrocatalysts are not only very good at this type of application but can be adhered to graphite free of binders, thus enhancing all their catalytic properties.

Authors

Laura Carolina Valencia-Valero,Edgar Fajardo-Puerto,Abdelhakim Elmouwahidi,Esther Bailón-García,Francisco Carrasco-Marín,Agustín Francisco Pérez-Cadenas

Journal

Gels

Published Date

2024/1/11

From Fenton and ORR 2e−-Type Catalysts to Bifunctional Electrodes for Environmental Remediation Using the Electro-Fenton Process

Currently, the presence of emerging contaminants in water sources has raised concerns worldwide due to low rates of mineralization, and in some cases, zero levels of degradation through conventional treatment methods. For these reasons, researchers in the field are focused on the use of advanced oxidation processes (AOPs) as a powerful tool for the degradation of persistent pollutants. These AOPs are based mainly on the in-situ production of hydroxyl radicals (OH•) generated from an oxidizing agent (H2O2 or O2) in the presence of a catalyst. Among the most studied AOPs, the Fenton reaction stands out due to its operational simplicity and good levels of degradation for a wide range of emerging contaminants. However, it has some limitations such as the storage and handling of H2O2. Therefore, the use of the electro-Fenton (EF) process has been proposed in which H2O2 is generated in situ by the action of the oxygen reduction reaction (ORR). However, it is important to mention that the ORR is given by two routes, by two or four electrons, which results in the products of H2O2 and H2O, respectively. For this reason, current efforts seek to increase the selectivity of ORR catalysts toward the 2e− route and thus improve the performance of the EF process. This work reviews catalysts for the Fenton reaction, ORR 2e− catalysts, and presents a short review of some proposed catalysts with bifunctional activity for ORR 2e− and Fenton processes. Finally, the most important factors for electro-Fenton dual catalysts to obtain high catalytic activity in both Fenton and ORR 2e− processes are summarized.

Authors

Edgar Fajardo-Puerto,Abdelhakim Elmouwahidi,Esther Bailón-García,Agustín Francisco Pérez-Cadenas,Francisco Carrasco-Marín

Published Date

2023/3/30

Bio-Waste Argan Nut Shell-Derived Porous Activated Carbon for High Performance Supercapacitor Electrode Material

The supercapacitors (SCs) have become a great candidate for high power applications in energy storage units which bridge the gap between conventional capacitors and batteries fuels cells. This is because of their relatively higher specific energy compared to normal parallel plate capacitors, and higher power density and longer cycling stability, fast charge–discharge time, low level of heating, appropriate dimension/weight and low cost. The Carbon materials are considered as ideal electrode materials for supercapacitors, they play an important role in energy storage devices due to their large specific surface area, tunable pore size, high electrical conductivity and strong mechanical property, nevertheless most of the commercial activated carbons are produced from fossil fuel-based precursor (petroleum and coal) which made them to be expensive and environmentally non-friendly. hence the increasing focus on …

Authors

Hajar EL-Ouahabi,Mohamed Khaddor,Maria Angeles Lillo-Rodenas,Maria DEL Carmen Roman Martinez,Abdelhakim Elmouwahidi,Agustín F Pérez-Cadenas,Mohamed Ouzzine

Journal

Electrochemical Society Meeting Abstracts 243

Published Date

2023/8/28

Highly graphitic Fe-doped carbon xerogels as dual-functional electro-Fenton catalysts for the degradation of tetracycline in wastewater

Fe-doped carbon xerogels with a highly developed graphitic structure were synthesized by a one-step sol-gel polymerization. These highly graphitic Fe-doped carbons are presented as promising dual-functional electro-Fenton catalysts to perform both the electro-reduction of O2 to H2O2 and H2O2 catalytic decomposition (Fenton) for wastewater decontamination. The amount of Fe is key to the development of this electrode material, since affects the textural properties; catalyzes the development of graphitic clusters improving the electrode conductivity; and influences the O2-catalyst interaction controlling the H2O2 selectivity but, at the same time is the catalyst for the decomposition of the electrogenerated H2O2 to OH• radicals for the organic pollutants oxidation. All materials achieve the development of ORR via the 2-electron route. The presence of Fe considerably improves the electro-catalytic activity. However, a …

Authors

A Barranco-López,AI Moral-Rodríguez,E Fajardo-Puerto,A Elmouwahidi,E Bailón-García

Journal

Environmental Research

Published Date

2023/7/1

Carbon microspheres with tailored texture and surface chemistry as electrode materials for supercapacitors

N-doped carbon microspheres were prepared by controlled sol–gel polymerization of resorcinol and formaldehyde. The pristine carbon microspheres were activated with CO2, and the sample activated for 90 min possessed the highest BET surface area, 1520 m2 g–1. After N-doping with urea, a 4 wt % N content was reached and the microspheres still had a high BET area of 1350 m2 g–1 with a porosity composed mostly of micropores (<2 nm) and a high packing density of 0.87 g cm–3. These N-doped microspheres were used as electrodes of supercapacitors, which showed a remarkable specific capacitance of 235 F g–1 at 125 mAg–1 in 1 M H2SO4 as electrolyte. This was due to pseudocapacitance reactions produced by the presence of N-groups. Furthermore, these electrodes were able to retain 56.5% of the capacitance at current density of 7 A g–1 and to retain 100% of the capacitance after 12000 …

Authors

Abdelhakim Elmouwahidi,Esther Bailón-García,Agustín F Pérez-Cadenas,Alain Celzard,Vanessa Fierro,Francisco Carrasco-Marín

Journal

ACS Sustainable Chemistry & Engineering

Published Date

2020/12/21

Professor FAQs

What is Abdelhakim Elmouwahidi's h-index at Universidad de Granada?

The h-index of Abdelhakim Elmouwahidi has been 12 since 2020 and 12 in total.

What are Abdelhakim Elmouwahidi's research interests?

The research interests of Abdelhakim Elmouwahidi are: Carbon material, Energy storage, Electrocatalysis, Adsorption, Photocatalysis

What is Abdelhakim Elmouwahidi's total number of citations?

Abdelhakim Elmouwahidi has 1,267 citations in total.

What are the co-authors of Abdelhakim Elmouwahidi?

The co-authors of Abdelhakim Elmouwahidi are Alain CELZARD, Vanessa Fierro, Carlos Moreno-Castilla, Francisco Carrasco Marin, Francisco J. Maldonado-Hódar, Prof. Agustin F. Perez-Cadenas.

Co-Authors

H-index: 73
Alain CELZARD

Alain CELZARD

Université de Lorraine

H-index: 69
Vanessa Fierro

Vanessa Fierro

Université de Lorraine

H-index: 66
Carlos Moreno-Castilla

Carlos Moreno-Castilla

Universidad de Granada

H-index: 54
Francisco Carrasco Marin

Francisco Carrasco Marin

Universidad de Granada

H-index: 49
Francisco J. Maldonado-Hódar

Francisco J. Maldonado-Hódar

Universidad de Granada

H-index: 39
Prof. Agustin F. Perez-Cadenas

Prof. Agustin F. Perez-Cadenas

Universidad de Granada

academic-engine

Useful Links