Harnessing hydrogen energy storage for renewable energy stability in China: A path to carbon neutrality

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 118, P. 93 - 101

Published: March 18, 2025

Language: Английский

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A Cellulose Pore Adsorption Strategy to Prepare CoFe/Co₈FeS₈ Heterostructures into N/S-Doped Carbon Cavities for Enhancing ORR/OER Performance

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 22, 2025

To address the complex synthesis and metal agglomeration for partially sulfurized heterostructures, a cellulose pore adsorption strategy is proposed to fabricate CoFe/Co8FeS8 heterostructures in N/S-doped biocarbon cavities. In absence of chelating agents, porosity active groups enable preadsorption ions N/S sources willow catkin via ion hydrogen bonding, respectively. The spatial confinement provided by biopores facilitates incomplete sulfuration while effectively preventing migration/aggregation. This catalyst demonstrates superior oxygen evolution reduction reaction performance, with minimal potential gap 0.72 V 0.1 mol·L–1 KOH, exceeding commercial Pt/C+RuO2. When applied Zn-air batteries, optimized electrode affords high specific capacity 803 mAh·gZn–1 long-term cycling durability 500 h. These enhancements are attributed self-driven electron transfer between CoFe Co8FeS8, from core carbon shell, which induces local enrichment at interface, influencing key reactants. Besides, ample heteroatoms shell further unlock extra sites, cavities also inhibit nanoparticle shedding during testing, thereby enhancing electrocatalytic stability. work offers simple yet effective designing advanced heterostructure electrocatalysts.

Language: Английский

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Enhancing the Performance of MXenes and MBenes-Based Materials for Maximized Efficiency in the Oxygen Reduction Reaction

IGI Global eBooks, Journal Year: 2025, Volume and Issue: unknown, P. 171 - 202

Published: April 8, 2025

MXenes and MBenes, advanced two-dimensional materials with outstanding structural electronic properties, are gaining prominence in energy conversion storage, particularly for the oxygen reduction reaction (ORR). ORR, essential fuel cells metal-air batteries, suffers from sluggish kinetics, efficient catalysts. While noble metals like platinum excel this role, their high cost scarcity necessitate alternatives. MXenes, consisting of transition metal carbides, nitrides, or carbonitrides, exhibit metallic conductivity tunable surface chemistry, making them ideal ORR catalysis. Similarly, nitride-based analogs, show great promise. Optimization methods selective etching, functionalization, heteroatom doping significantly enhance catalytic performance. This review explores synthesis, structure, mechanisms highlighting recent progress, addressing stability scalability challenges, identifying future directions improving efficiency sustainable applications.

Language: Английский

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Rare Earth Ce/CeO2 Electrocatalysts: Role of High Electronic Spin State of Ce and Ce3+/Ce4+ Redox Couple on Oxygen Reduction Reaction

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

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Durable built-in electric field in CoSe2-FeSe2@NC on N-doped honeycomb carbon for long-term efficient oxygen electrocatalysis toward zinc-air battery

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: 512, P. 162739 - 162739

Published: April 17, 2025

Language: Английский

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