Constructing delocalized electronic structures to motivate the oxygen reduction activity of zinc selenide for high-performance zinc-air battery

Chemical Engineering Journal, Год журнала: 2024, Номер 481, С. 148598 - 148598

Опубликована: Янв. 7, 2024

Язык: Английский

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Engineering a High-Loading Sub-4 nm Intermetallic Platinum–Cobalt Alloy on Atomically Dispersed Cobalt–Nitrogen–Carbon for Efficient Oxygen Reduction in Fuel Cells

Nano Letters, Год журнала: 2024, Номер 24(13), С. 3961 - 3970

Опубликована: Март 25, 2024

Developing a high-performance membrane electrode assembly (MEA) poses formidable challenge for fuel cells, which lies in achieving both high metal loading and efficient catalytic activity concurrently MEA catalysts. Here, we introduce porous Co@NC carrier to synthesize sub-4 nm PtCo intermetallic nanocrystals, an impressive Pt of 27 wt %. The PtCo–CoNC catalyst demonstrates exceptional remarkable stability the oxygen reduction reaction. Advanced characterization techniques theoretical calculations emphasize synergistic effect between alloys single Co atoms, enhances desorption OH* intermediate. Furthermore, PtCo–CoNC-based cathode delivers power density 1.22 W cm–2 test owing enhanced mass transport, is verified by simulation results O2 distributions current inside layer. This study lays groundwork design catalysts with practical applications cells.

Язык: Английский

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Ultrafine PtCo alloy by pyrolysis etching-confined pyrolysis for enhanced hydrogen evolution

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 660, С. 997 - 1009

Опубликована: Янв. 22, 2024

Язык: Английский

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Pt nanoparticles anchored by oxygen vacancies in MXenes for efficient electrocatalytic hydrogen evolution reaction

Nanoscale, Год журнала: 2024, Номер 16(16), С. 8020 - 8027

Опубликована: Янв. 1, 2024

Pt/MXene heterostructures were prepared by constructing oxygen vacancies on MXene to anchor Pt nanoparticles, which exhibited accelerated HER kinetics in 0.5 M H 2 SO 4 solution due the synergistic effect between MXenes and nanoparticles.

Язык: Английский

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Strong-weak dual interface engineered electrocatalyst for large current density hydrogen evolution reaction

Communications Materials, Год журнала: 2025, Номер 6(1)

Опубликована: Янв. 18, 2025

Abstract Supported nanocatalysts are crucial for hydrogen production, yet their activity and stability challenging to manage due complex metal-support interfaces. Herein, we design Pt@ anatase&rutile-TiO 2 with a strong-weak dual interface by modifying TiO using high-energy ball milling in-situ reduction vary surface energies. Experiments density functional theory calculations reveal that the strong Pt-anatase enhances adsorption. In contrast, weak Pt-rutile facilitates desorption, simultaneously preventing Pt agglomeration increasing reaction rate. As result, tailored catalyst has 529.3 mV overpotential at 1000 mA cm −2 in 0.5 M H SO 4 , 0.69 times less than commercial Pt/C. It also possesses 8.8 mass of Pt/C maintains low after 2000 cyclic voltammetry cycles, suggesting high stability. This engineering strategy shows potential overall water splitting proton exchange membrane electrolyzer, advancing efficient supported nanocatalysts.

Язык: Английский

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Intensified Gas Diffusion in Ordered Mesoporous PtCo Alloys for Enhanced Oxygen Reduction Electrocatalysis

Journal of Materials Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Three-dimensional ordered meso-structured PtCo alloy nanoparticles are fabricated to enhance O 2 diffusion and accelerate the kinetics of oxygen reduction in proton-exchange membrane fuel cells.

Язык: Английский

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Fe based MOF encapsulating triethylenediamine cobalt complex to prepare a FeN3-CoN3 dual-atom catalyst for efficient ORR in Zn-air batteries

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 676, С. 871 - 883

Опубликована: Июль 23, 2024

Язык: Английский

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Plasma-driven catalytic oxidation of ethylene glycol on self-standing nanoflower-like PdAuCu nanosheets

Surfaces and Interfaces, Год журнала: 2024, Номер 46, С. 103951 - 103951

Опубликована: Янв. 23, 2024

Язык: Английский

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Synergy of compress strain and antioxidant of platinum-copper for enhanced the oxygen reduction performance

Nano Materials Science, Год журнала: 2024, Номер unknown

Опубликована: Март 1, 2024

The development of efficient and durable electrocatalysts for oxygen reduction reaction (ORR) holds a pivotal significance in the successful commercialization proton exchange membrane fuel cells (PEMFCs) but is still challenging. Herein, we report worm-liked PtCu nanocrystals dispersed on nitrogen-doped carbon hollow microspheres (Pt0.38Cu0.62/N-HCS). Benefiting from its structural compositional advantages, resulting Pt0.38Cu0.62/N-HCS catalyst delivers exceptional electrocatalytic activity ORR, with half-wave potential (E1/2) 0.837 ​V, mass 0.672 A mgPt-1, Tafel slope 50.66 ​mV dec-1, surpassing that commercial Pt/C. Moreover, follows desired four-electron transfer mechanism throughout ORR process, thereby displaying high selectivity direct O2 to H2O. Remarkably, this also showcases stability, only 25 drop E1/2 after 10,000 cycles an acidic electrolyte. Theoretical calculations elucidate incorporation Cu into Pt lattice induces compressive strain, which effectively tailors d band center active sites strengthens surface chemisorption molecules alloys. Consequently, exhibits improved ability adsorb surface, accelerating kinetics conversion ∗OOH. Additionally, atoms, not serving as sacrificial anode, undergo preferential oxidation during PEMFCs operation when compared Pt, stable species alloys contributes significantly maintaining strain effect, collectively enhancing both durability. Overall, research offers effective promising approach enhance stability Pt-based PEMFCs.

Язык: Английский

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Crystalline–Amorphous Heterophase PdMoCrW Tetrametallene: Highly Efficient Oxygen Reduction Electrocatalysts for a Long-Term Zn–Air Battery

Langmuir, Год журнала: 2024, Номер 40(21), С. 11307 - 11316

Опубликована: Май 13, 2024

Metallenes have received sustained attention owing to their unique microstructure characteristics and compelling catalytic applications, but the synthesis of multielement crystalline–amorphous metallenes remains a formidable challenge. Herein, we report one-step wet chemical reduction method synthesize composition-tunable heterophase PdMoCrW tetrametallene. As-synthesized tetrametallene is composed approximately six seven atomic layers has flexible crimpiness, structure, high-valence metal species. Time-dependent experiments show that follows three-step growth mechanism includes nucleation, lateral growth, atom diffusion, respectively. The novel ultrathin optimized Pd electronic hydrophilic surface together greatly promote activity stability in alkaline oxygen reaction. Pd75.9Mo9.4Cr8.9W5.8/C exhibits excellent mass specific activities 2.81 A mgPd–1 4.05 mA cm–2, which are 20.07/14.46 23.42/16.20 times higher than those commercial Pt/C Pd/C, Furthermore, Zn–air battery assembled using as cathode catalyst achieves peak power density 156 mW cm–2 an ultralong durability 329 h. This study reports effective strategy for constructing quaternary advance non-Pt electrocatalysts toward reaction (ORR) performance battery.

Язык: Английский

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