Enhanced efficiency and durability of ...
Document type :
Article dans une revue scientifique
Permalink :
Title :
Enhanced efficiency and durability of nickel sulfide catalyst integrated with reduced graphene oxide: Exploring hierarchically porous structures for methanol oxidation reaction
Author(s) :
Salmi, Mehdi [Auteur]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
Khossossi, Nabil [Auteur]
Delft University of Technology [TU Delft]
Boudad, Yousra [Auteur]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
Jama, Charafeddine [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Bentiss, Fouad [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Faculty of Science - Chouaib Doukkali University
Zaroual, Zaina [Auteur]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
El Ghachtouli, Sanae [Auteur]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
Khossossi, Nabil [Auteur]
Delft University of Technology [TU Delft]
Boudad, Yousra [Auteur]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
Jama, Charafeddine [Auteur]

Unité Matériaux et Transformations (UMET) - UMR 8207
Bentiss, Fouad [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Faculty of Science - Chouaib Doukkali University
Zaroual, Zaina [Auteur]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
El Ghachtouli, Sanae [Auteur]
Université Hassan II de Casablanca = University of Hassan II Casablanca = جامعة الحسن الثاني (ar) [UH2MC]
Journal title :
International Journal of Hydrogen Energy
Abbreviated title :
International Journal of Hydrogen Energy
Pages :
580-595
Publisher :
Elsevier BV
Publication date :
2025-01
ISSN :
0360-3199
HAL domain(s) :
Chimie/Matériaux
English abstract : [en]
The growing demand for sustainable energy solutions highlights the need for advancements in electrocatalysts for direct methanol fuel cells (DMFCs). This study introduces a novel approach to enhance the efficiency and ...
Show more >The growing demand for sustainable energy solutions highlights the need for advancements in electrocatalysts for direct methanol fuel cells (DMFCs). This study introduces a novel approach to enhance the efficiency and durability of nickel sulfide (NiS) catalysts. We developed a hierarchically porous structure integrated with reduced graphene oxide (rGO) on a nickel foam substrate. Using a dynamic hydrogen bubble template (DHBT) technique, we created a porous nickel scaffold. We then electrodeposited graphene oxide and NiS onto this scaffold, resulting in a hybrid structure termed NiS-rGO-Ni/NF. Characterization through SEM, XRD, and XPS confirmed that the catalyst has a highly porous structure with uniformly distributed Ni3S2 and Ni3S4 phases. The NiS-rGO-Ni/NF catalyst showed significant improvements over conventional NiS/NF. It achieved a peak current density of 84.10 mA/cm2 in the presence of 0.1 M methanol, compared to 30.32 mA/cm2 with NiS/NF. This enhancement is due to the porous nickel layer created using DHBT and the integration of rGO. Additionally, the NiS-rGO-Ni/NF catalyst demonstrated superior reaction kinetics, evidenced by a decrease in the Tafel slope from 204 mV/dec to 122 mV/dec. It also exhibited a remarkable increase in the electrochemically active surface area, reaching 179 cm2 compared to 22 cm2 for NiS/NF. These improvements in surface area and kinetics contribute to its excellent stability, with the catalyst maintaining consistent performance over 20 h of continuous operation. These results underscore the effectiveness of the NiS-rGO-Ni/NF catalyst in methanol oxidation and its potential for more efficient and stable electrochemical applications.Show less >
Show more >The growing demand for sustainable energy solutions highlights the need for advancements in electrocatalysts for direct methanol fuel cells (DMFCs). This study introduces a novel approach to enhance the efficiency and durability of nickel sulfide (NiS) catalysts. We developed a hierarchically porous structure integrated with reduced graphene oxide (rGO) on a nickel foam substrate. Using a dynamic hydrogen bubble template (DHBT) technique, we created a porous nickel scaffold. We then electrodeposited graphene oxide and NiS onto this scaffold, resulting in a hybrid structure termed NiS-rGO-Ni/NF. Characterization through SEM, XRD, and XPS confirmed that the catalyst has a highly porous structure with uniformly distributed Ni3S2 and Ni3S4 phases. The NiS-rGO-Ni/NF catalyst showed significant improvements over conventional NiS/NF. It achieved a peak current density of 84.10 mA/cm2 in the presence of 0.1 M methanol, compared to 30.32 mA/cm2 with NiS/NF. This enhancement is due to the porous nickel layer created using DHBT and the integration of rGO. Additionally, the NiS-rGO-Ni/NF catalyst demonstrated superior reaction kinetics, evidenced by a decrease in the Tafel slope from 204 mV/dec to 122 mV/dec. It also exhibited a remarkable increase in the electrochemically active surface area, reaching 179 cm2 compared to 22 cm2 for NiS/NF. These improvements in surface area and kinetics contribute to its excellent stability, with the catalyst maintaining consistent performance over 20 h of continuous operation. These results underscore the effectiveness of the NiS-rGO-Ni/NF catalyst in methanol oxidation and its potential for more efficient and stable electrochemical applications.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Research team(s) :
Procédés de Recyclage et de Fonctionnalisation (PReF)
Submission date :
2025-01-20T12:23:15Z
2025-01-22T08:25:23Z
2025-01-22T08:27:32Z
2025-01-22T08:25:23Z
2025-01-22T08:27:32Z