Rare Earth Ce/CeO2 Electrocatalysts: Role of High Electronic Spin State of Ce and Ce3+/Ce4+ Redox Couple on Oxygen Reduction Reaction DOI Creative Commons
Shaik Gouse Peera, Seung Won Kim

Nanomaterials, Journal Year: 2025, Volume and Issue: 15(8), P. 600 - 600

Published: April 14, 2025

With unique 4f electronic shells, rare earth metal-based catalysts have been attracting tremendous attention in electrocatalysis, including oxygen reduction reaction (ORR). In particular, atomically dispersed Ce/CeO2-based explored extensively due to several features. This review article provides a comprehensive understanding of (i) the significance effect Ce high-spin state on ORR activity enhancement Pt and non-pt electrocatalysts, (ii) spatially confining stabilizing ceria generation transition catalysts, (iii) experimental theoretical evidence Ce3+ ↔ Ce4+ redox pain radical scavenging, (iv) electrons d-band center electron transfer between N-doped carbon metal for enhanced activity, (v) Pt/CeO2/carbon heterojunctions stability electrocatalyst ORR. Among strategies synthesizing Ce/CeO2 metal–organic framework (MOF)-derived are being perused tendency readily coordinate with O- N-containing ligands, which upon undergoing pyrolysis, results formation high surface area, porous networks metallic/clusters/nanoparticles active sites. paper an overview recent advancements regarding derived from MOF precursor fuel cells metal–air battery applications we conclude insights into key issues future development directions.

Language: Английский

Energy and exergy analysis of complex gas turbines systems powered by a mixture of hydrogen and methane DOI
A. G. Harutyunyan, Krzysztof Badyda, Łukasz Szabłowski

et al.

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

Citations

1
Production and Storage of Hydrogen from Biomass and Other Sources: Technologies and Policies DOI Creative Commons

Georgios Giakoumakis,

D.K. Sidiras

Energies, Journal Year: 2025, Volume and Issue: 18(3), P. 650 - 650

Published: Jan. 30, 2025

Hydrogen has emerged as a critical energy carrier for achieving global decarbonization and supporting sustainable future. This review explores key advancements in hydrogen production technologies, including electrolysis, biomass gasification, thermochemical processes, alongside innovations storage methods like metal hydrides liquid organic carriers (LOHCs). Despite its promise, challenges such high costs, scalability issues, safety concerns persist. Biomass gasification stands out dual benefits of waste management carbon neutrality yet hurdles feedstock variability efficiency need further attention. also identifies opportunities improvement, developing cost-effective catalysts hybrid systems, while emphasizing future research on improving tackling bottlenecks. By addressing these challenges, can play central role the transition to cleaner systems.

Language: Английский

Citations

0
Bifunctional barium cerate catalyst doped with Fe for enhanced electrochemical stability during oxygen reduction and evolution reactions DOI
P. C. Meléndez-González,

J.F. Méndez-Vázquez,

W. J. Pech-Rodríguez

et al.

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский

Citations

0
Achieving high stability in nickel-based solid oxide fuel cell stacks with direct internal reforming of methane DOI
Zheng Zhang, Yang Zhang,

Mingzhong Shen

et al.

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 106, P. 1285 - 1295

Published: Feb. 8, 2025

Language: Английский

Citations

0
Challenges and innovations in green hydrogen storage technologies DOI
Vanessa Rute Zavala, Inês Pereira, Rodrigo de Oliveira Vieira

et al.

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 113, P. 322 - 339

Published: March 1, 2025

Citations

0
Effects of Annealing on Hydrogen Storage Performance in TiZrCrMnFeNi High-Entropy Alloy DOI Creative Commons
Tengfei Cheng, Jing Huang,

Wanggang Fang

et al.

Crystals, Journal Year: 2025, Volume and Issue: 15(4), P. 297 - 297

Published: March 25, 2025

This study employed annealing heat treatment ranging from 900 to 1300 °C systematically investigate the effects of temperature on microstructure and hydrogen storage performance equimolar TiZrCrMnFeNi high-entropy alloy. The research indicates that alloy is composed C14 Laves phase a small amount cubic phase. Compared as-cast alloy, annealed at high (1000~1200 °C) exhibited increased homogeneity, higher content phase, significant enhancement in capacity. led changes unit cell volume with an inverse relationship between absorption desorption plateau pressures. An increase resulted lower pressure, making reaction more difficult consequently increasing enthalpy change for desorption. not only reveals intrinsic alloys, but also provides experimental evidence theoretical guidance design development materials excellent characteristics.

Language: Английский

Citations

0
Optimization of Hydrogen Combustion in Diesel Engines: A CFD-Based Approach for Efficient Hydrogen Mixing and Emission Reduction DOI Creative Commons

Bogdan Suatean,

Grigore Cican, Stéphane Guilain

et al.

Fuels, Journal Year: 2025, Volume and Issue: 6(2), P. 27 - 27

Published: April 8, 2025

Hydrogen internal combustion engines (ICEs) have gained significant attention as a promising solution for achieving zero-carbon emissions in the transportation sector. This study investigates conversion of 2 L Diesel ICE into lean hydrogen-powered ICE, focusing on key challenges such hydrogen mixing, pre-ignition, flame development, and NOx emissions. The novelty this research lies specific modifications made to optimize engine performance reduce while utilizing existing infrastructure. identifies several important design changes successful hydrogen, including following: Intake port design: transitioning from swirl tumble enhance mixing; Injection spark plug configuration: using lateral injection system combined with central improve combustion; Piston employing lenticular piston shape adaptable depth Mitigating Coanda effect: preventing issues at deflectors or caps; Head maintaining flat head efficient ensuring adequate cooling avoid pre-ignition. These findings highlight importance converting providing solid foundation further ICEs, which could contribute carbon emission reduction more sustainable energy transition.

Language: Английский

Citations

0
Synergistic Regulation of Rare Earth and Noble Metal Promoters on Ni-based Bifunctional Materials for Enhanced CO2 Methanation Performance and Reaction Mechanism DOI

Yang Zheng,

Wei Su, Zhenghao Wang

et al.

Catalysis Letters, Journal Year: 2025, Volume and Issue: 155(5)

Published: April 9, 2025

Language: Английский

Citations

0
Life cycle environmental impact assessment and review of hydrogen fuels obtained from various sources for vehicles DOI
Sümeyya Ayça, İbrahim Dinçer

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 127, P. 265 - 274

Published: April 14, 2025

Language: Английский

Citations

0
Rare Earth Ce/CeO2 Electrocatalysts: Role of High Electronic Spin State of Ce and Ce3+/Ce4+ Redox Couple on Oxygen Reduction Reaction DOI Creative Commons
Shaik Gouse Peera, Seung Won Kim

Nanomaterials, Journal Year: 2025, Volume and Issue: 15(8), P. 600 - 600

Published: April 14, 2025

With unique 4f electronic shells, rare earth metal-based catalysts have been attracting tremendous attention in electrocatalysis, including oxygen reduction reaction (ORR). In particular, atomically dispersed Ce/CeO2-based explored extensively due to several features. This review article provides a comprehensive understanding of (i) the significance effect Ce high-spin state on ORR activity enhancement Pt and non-pt electrocatalysts, (ii) spatially confining stabilizing ceria generation transition catalysts, (iii) experimental theoretical evidence Ce3+ ↔ Ce4+ redox pain radical scavenging, (iv) electrons d-band center electron transfer between N-doped carbon metal for enhanced activity, (v) Pt/CeO2/carbon heterojunctions stability electrocatalyst ORR. Among strategies synthesizing Ce/CeO2 metal–organic framework (MOF)-derived are being perused tendency readily coordinate with O- N-containing ligands, which upon undergoing pyrolysis, results formation high surface area, porous networks metallic/clusters/nanoparticles active sites. paper an overview recent advancements regarding derived from MOF precursor fuel cells metal–air battery applications we conclude insights into key issues future development directions.

Language: Английский

Citations

0