Carbon-Encapsulated Ni Nanoparticles Catalysts Derived from Ni-Hexamine Coordination Frameworks for Oxygen Reduction Reaction and Oxygen Evolution Reaction

Catalysts, Journal Year: 2025, Volume and Issue: 15(4), P. 338 - 338

Published: March 31, 2025

Developing efficient bifunctional oxygen reduction (ORR) and evolution (OER) electrocatalysts is critical for renewable energy technologies. Noble metal catalysts face limitations in cost, scarcity, compatibility. Herein, we report the synthesis of nickel nanoparticles encapsulated nitrogen-doped carbon nanosheets (Ni@NC-T) via a solvothermal polymerization pyrolysis process using Ni-hexamine coordination framework (NiHMT) as precursor. The Ni@NC-900 catalyst exhibits superior ORR OER activity under alkaline conditions, with an performance (half-wave potential = 0.86 V) comparable to commercial Pt/C overpotential only 430 mV at 10 mA cm−2. Structural analysis indicates that hierarchical porous structure high specific surface area (409 m2 g−1) facilitate exposure active sites enhance mass transport. surface-doped nitrogen species, predominantly form pyridinic N graphitic N, promote electron transfer during ORR. Furthermore, its application cathode rechargeable zinc-air batteries results power density 137 mW cm−2, surpassing levels many existing carbon-based catalysts. This work highlights facile strategy fabrication transition metal-based MOF-derived matrices, promising storage conversion devices.

Language: Английский

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Atomic Rare‐Earth Gd‐N‐C Nanosheets with Low f‐d‐p Hybridization Energy for Efficient Oxygen Reduction Reaction

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: April 7, 2025

Abstract Developing the new member of transition Metal‐nitrogen‐carbon (M‐N‐C) for oxygen reduction reaction (ORR) is critical to address issues in 3d‐orbital metal M‐N‐C as noble metal‐free catalyst achieve affordable fuel cells and metal‐air batteries. Herein, Gd‐N‐C nanosheets are developed by pyrolyzing self‐polymerized compound 2, 6‐diaminopyridine initiated GdCl 3 . The features a unique mixed structure single GdN 5 moieties Gd x N y O z atomic clusters, exhibiting excellent ORR performance with half‐wave potentials 0.89 0.76 V versus RHE 0.1 M KOH 0.5 H 2 SO 4 , respectively, activity confirmed high‐performance Zn‐air battery proton exchange membrane cell maximum power density 191 370 mW cm −2 cathodes, respectively. Moreover, theoretical calculation verifies that moiety specific f‐d hybridization facilitates interaction intermediate OH* produce d‐p hybridization, which can significantly reduce adsorption energy OH*, while existence clusters also enhance effect effectively promote ORR. results confirm active site first time extend library catalysts.

Language: Английский

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Three-dimensional spherical NiCoOX@NiCo layered double hydroxides nanosheets for high-performance all-solid-state supercapacitors

Journal of Energy Storage, Journal Year: 2023, Volume and Issue: 73, P. 109165 - 109165

Published: Oct. 5, 2023

Language: Английский

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Pore-edge graphitic nitride-dominant hierarchically porous carbons for boosting oxygen reduction catalysis

Sustainable Energy & Fuels, Journal Year: 2024, Volume and Issue: 8(9), P. 2050 - 2058

Published: Jan. 1, 2024

The construction of pore structures at different scales (atomic defect and molecular porous structures) is the most promising method to achieve excellent ORR catalytic activity for carbon-based catalysts.

Language: Английский

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Nitrogen, sulfur co-coordinated iron single-atom catalysts with the optimized electronic structure for highly efficient oxygen reduction in Zn-air battery and fuel cell

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 671, P. 643 - 652

Published: May 27, 2024

Language: Английский

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