Zipper‐Like Interlocked Heterostructure of NiFe Layered Double Hydroxide‐WN for Super‐Stable Oxygen Evolution over 4500 h

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 22, 2024

Abstract The nickel‐iron based materials are widely studied as excellent oxygen evolution reaction (OER) electrocatalysts. However, its relatively poor OER stability limits practical applications. Herein, a zipper‐like interlocked heterostructure of NiFe layered double hydroxide (LDH)‐WN is constructed. LDH‐WN exhibits not only ultrahigh activity 228 mV overpotential at current density 50 mA cm −2 , but also extremely long‐term over 4500 h and 550 an industrial ≈350 which ascribed to special structure. Moreover, in situ Raman confirms that the presence WN can efficiently achieve LDH reconstruction slower metal dissolution during OER, therefore boosts stability. DFT calculations reveal increase *O adsorption capability conductivity layer, anchor atoms layer improve energy barrier. In short, this work presents new method constructing Ni‐Fe‐based catalysts, would accelerate application.

Language: Английский

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Promoting Electrocatalytic Oxygen Reactions Using Advanced Heterostructures for Rechargeable Zinc–Air Battery Applications

ACS Nano, Journal Year: 2024, Volume and Issue: 18(33), P. 21651 - 21684

Published: Aug. 12, 2024

In order to facilitate electrochemical oxygen reactions in electrically rechargeable zinc-air batteries (ZABs), there is a need develop innovative approaches for efficient electrocatalysts. Due their reliability, high energy density, material abundance, and ecofriendliness, ZABs hold promise as next-generation storage conversion devices. However, the large-scale application of currently hindered by slow kinetics reduction reaction (ORR) evolution (OER). development heterostructure-based electrocatalysts has potential surpass limitations imposed intrinsic properties single material. This Account begins with an explanation configurations fundamentals electrochemistry air electrode. Then, we summarize recent progress respect variety heterostructures that exploit bifunctional electrocatalytic overview impact on ZAB performance. The range heterointerfacial engineering strategies improving ORR/OER performance includes tailoring surface chemistry, dimensionality catalysts, interfacial charge transfer, mass transport, morphology. We highlight multicomponent design take these features into account create advanced highly active catalysts. Finally, discuss challenges future perspectives this important topic aim enhance activity batteries.

Language: Английский

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Manipulating the Electronic Properties of an Fe Single Atom Catalyst via Secondary Coordination Sphere Engineering to Provide Enhanced Oxygen Electrocatalytic Activity in Zinc‐Air Batteries

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(44)

Published: Sept. 16, 2024

Abstract Oxygen reduction and evolution reactions are two key processes in electrochemical energy conversion technologies. Synthesis of nonprecious metal, carbon‐based electrocatalysts with high oxygen bifunctional activity stability is a crucial, yet challenging step to achieving conversion. Here, an approach address this issue: synthesis atomically dispersed Fe electrocatalyst (Fe 1 /NCP) over porous, defect‐containing nitrogen‐doped carbon support, described. Through incorporation phosphorus atom into the second coordination sphere iron, durability boundaries catalyst pushed unprecedented level alkaline environments, such as those found zinc‐air battery. The rationale delicately incorporate P heteroatoms defects close central metal sites (FeN 4 ‐OH) order break local symmetry electronic distribution. This enables suitable binding strength oxygenated intermediates. In situ characterizations theoretical studies demonstrate that these synergetic interactions responsible for stability. These intrinsic advantages /NCP enable potential gap mere 0.65 V power density 263.8 mW cm −2 when incorporated findings underscore importance design principles access high‐performance green

Language: Английский

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Safe, Facile, and Straightforward Fabrication of Poly(N‐vinyl imidazole)/Polyacrylonitrile Nanofiber Modified Separator as Efficient Polysulfide Barrier Toward Durable Lithium–Sulfur Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Abstract Lithium–sulfur (Li–S) batteries are gaining tremendous attention as promising energy storage solutions due to their impressive density and the affordability of sulfur. However, practical use Li–S encounter major obstacles such polysulfide shuttle effect, which leads capacity loss decreased cycling stability. Herein, a polyethylene imidazole/polyacrylonitrile (PVIMPAN) nanofibers‐modified Celgard separator is constructed via facile electrospinning strategy used polysulfides barrier for batteries. The electron‐deficient imidazole groups introduced on surface PVIMPAN separators create that prevents shuttling extends cycle life. Additionally, developed exhibits significantly enhanced Li + transfer number 0.60, compared commercial (0.20). This enhancement can be attributed strong binding between bis(trifluoromethanesulphonyl)imide anion, leading improved plating stripping performance. Consequently, incorporating into enable achievement discharge 786.0 mAh g −1 with close 100% Coulombic efficiency after 500 cycles at 1C (25 °C). It believed this work provide valuable insights designing suitable robust metal–sulfur

Language: Английский

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Core–Shell Co‐Co_xP Nanoparticle‐Embedded N‐Doped Carbon Nanowhiskers Hollow Sphere for Efficient Oxygen Evolution Electrocatalysis

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: July 26, 2024

Abstract The development of efficient oxygen evolution reaction (OER) electrocatalysts is critical to overcome the efficiency bottleneck in hydrogen generation via water electrolysis. Hollow nanostructured materials have emerged as a hot topic for electrocatalysis research because their advantages, including abundant active sites, large contact area between catalyst and electrolyte, short transmission path. As highly stable OER electrocatalysts, cobalt‐based attracted more attention. In this work, cobalt metal/cobalt phosphides/nitrogen‐doped carbon composites (Co‐Co x P/NC) with hierarchical hollow structure are designed by using ZIF‐67 microspheres precursors. By coating ZIF‐8 on surface further carbonizing, nanowhiskers successfully formed spheres under catalytic effect Co nanoparticles at high temperature. subsequent phosphating process, solid nanocrystalline particles transformed into core–shell CoP 2 P account Kirkendall effect. Through optimization microstructure material synergistic transition metal, metal phosphide, nitrogen doping, overpotential optimal only 287 mV 10 mA cm −2 current density 1 m KOH.

Language: Английский

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Enhanced Electrocatalytic Hydrogen Peroxide Production via a CuWO₄/WO₃ Heterojunction with High Selectivity and Stability

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 12, 2025

The electrocatalytic conversion of oxygen to hydrogen peroxide offers a promising pathway for sustainable energy production. However, the development catalysts that are highly active, stable, and cost-effective synthesis remains significant challenge. In this study, novel polyacid–based metal–organic coordination compound (Cu–PW) was synthesized using hydrothermal approach. Cu–PW served as precursor construct composite electrocatalyst featuring heterointerface between CuWO4 WO3 (CuWO4/WO3) through pyrolysis. CuWO4/WO3 heterojunction exhibits an impressive H2O2 selectivity 91.84% at 0.5 V, marking 19.65% improvement compared pristine Cu–PW. Furthermore, catalyst demonstrates exceptional stability, maintaining continuous operation 29 h. At 0.1 it delivers yield 1537.8 mmol g–1 h–1, with Faraday efficiency (FE) 85%. Additionally, effectively degrades methyl blue, achieving 95% removal from aqueous system within 30 min. Theoretical analysis further corroborates high electroactivity structure. Cu–O–W bridge formed during reaction facilitates interfacial electron transport enhances role W–O bond in proton adsorption transfer kinetics. This strong coupling promotes formation *OOH intermediates, thereby favoring generation. Hence, as-prepared great potential efficient green peroxide, exhibiting two-electron reduction catalyst. work new approach fabricating selectivity, paving way production, significantly reducing reliance on conventional anthraquinone process.

Language: Английский

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Electronic Structure Modulation in N, P, S Tri‐Doped Nanofibers with Interpenetrated Pores for Enhanced Oxygen Reduction Reaction

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

Published: Jan. 16, 2025

Abstract Multi‐heteroatom‐doped metal‐free carbons with well‐tailored electronic structures are regarded as promising oxygen reduction reaction (ORR) catalysts. However, their active sites often hindered by the carbon matrix, resulting in reduced catalytic activity. Herein, nitrogen, phosphorus, and sulfur tri‐doped hollow hierarchical porous nanofibers (NPS‐HPCNFs) interpenetrated pores synthesized using a facile coaxial electrospinning method. The distinctive steric confinement induced created positive microenvironment for ORR. As result, resultant NPS‐HPCNF catalyst exhibits half‐wave potential ( E 1/2 ) of 0.86 V (vs. RHE) superb long‐term stability 0.1 m KOH. Furthermore, zinc‐air battery (ZAB) assembled achieves great peak power density 210 mW cm −2 superior specific capacity 795 mAh g −1 , outperforming commercial Pt/C candidate. In addition, functional theory (DFT) calculations reveal that synergistic effect N, P, S tri‐doping combined defect effectively regulated structure significantly enhanced * OOH adsorption, thus accelerating ORR process. Therefore, abundant represent eco‐friendly alternative to state‐of‐the‐art electrocatalysts various electrochemical energy applications.

Language: Английский

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Nanoengineering of P, Se co-doped hollow microspheres induced charge redistribution with P-Se-M bond as multifunctional electrocatalysts

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 686, P. 218 - 231

Published: Jan. 31, 2025

Language: Английский

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Emerging Nitrogen and Sulfur Co‐doped Carbon Materials for Electrochemical Energy Storage and Conversion

Small, Journal Year: 2025, Volume and Issue: 21(11)

Published: Feb. 16, 2025

Abstract The growing global energy demands, coupled with the imperative for sustainable environmental challenges, have sparked significant interest in electrochemical storage and conversion (EESC) technologies. Metal‐free heteroatom‐doped carbon materials, especially those codoped nitrogen (N) sulfur (S), gained prominence due to their exceptional conductivity, large specific surface area, remarkable chemical stability, enhanced performance. strategic incorporation of N S atoms into framework plays a pivotal role modulating electron distribution creating catalytically active sites, thereby significantly enhancing EESC This review examines key synthetic strategies fabricating N, materials (NSDCMs) provides comprehensive overview recent advancements NSDCMs applications. These encompass various systems such as supercapacitors, alkali‐ion batteries, lithium–sulfur batteries. Energy processes, including hydrogen evolution, oxygen reduction/evolution, dioxide reduction are also covered. Finally, future research directions discussed field, aiming highlight promising potential multifunctional capabilities driving further systems.

Language: Английский

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Nonmetallic High‐Entropy‐Engineered Nanocarbons for Advanced ORR Electrocatalysis

Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

Abstract High‐entropy materials are poised to revolutionize science and industrial applications due their design flexibility, peculiar performance, broad applicability. In this study, we present a proof‐of‐concept high‐entropy engineered nanocarbon (HENC) co‐doped with five nonmetal elements (B, F, P, S, N), synthesized via in situ polymerization modification of ZIF‐8 followed by pyrolysis. The HENC exhibits outstanding performance as electrocatalyst for the oxygen reduction reaction (ORR), activity on par benchmark Pt/C electrocatalysts superior cyclic stability. Simulations all‐site calculations reveal that synergistic effects abundant heteroatoms increased system entropy facilitate formation *O 2 species, N, S acting key active elements, while co‐doping B F further enhances Notably, HENCs have been validated cathode catalysts zinc–air batteries, achieving an impressive peak power density 604 mW cm −2 demonstrating long‐term stability over 16‐day period, outpacing commercial catalyst (542 ). This work not only enriches concept high advances understanding but also opens new avenue development high‐performance low‐cost catalysts.

Language: Английский

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