Synergistic Effect of Electrocatalyst for Enhanced Oxygen Reduction Reaction: Low Pt-Loaded CuPt Alloy Nanoparticles Supported on N-Doped Hierarchical Porous Carbon

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(11), P. 13893 - 13902

Published: March 11, 2024

It is challenging to synthesize oxygen reduction reaction (ORR) electrocatalysts that are highly efficient, affordable, and stable for use in proton exchange membrane fuel cells. To address this challenge, we developed a low platinum-loading (only 6.68% wt) ORR catalyst (PtCu1-NC), comprising CuPt nanoparticles (average size: 1.51 nm) supported on the N-doped carbon substrates. PtCu1-NC possesses high specific surface area of 662 m2 g–1 hierarchical porous structure, facilitating efficient mass transfer. The synergistic effect from introduced copper electron nitrogen modify electronic structure platinum, effectively accelerating enhancing stability. Density functional theory calculations demonstrate catalytic mechanism further verify effect. Electrochemical assessments indicate exhibits activity 5.3 5.6 times higher, respectively, than commercial Pt/C. half-wave potential 27 mV more positive electrochemical active value 104.3 g–1, surpassing Approximately 78% current retained after 10,000 s chronoamperometry measurement. These results highlight effectiveness alloying improving performance.

Language: Английский

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Self‐Assembly Strategy for Constructing Porous Boron and Nitrogen Co‐Doped Carbon as an Efficient ORR Electrocatalyst toward Zinc‐Air Battery

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: 30(28)

Published: March 16, 2024

Abstract Carbon nanomaterials doped with N and B could activate nearby carbon atoms to promote charge polarization through the synergistic coupling effect between atoms, thus facilitating adsorption of O 2 weakening O−O bond enhance oxygen reduction reaction. Herein, a simple controllable self‐assembly strategy is applied synthesize porous B, co‐doped carbon‐based catalysts (BCN‐P), which employs macrocyclic molecule cucurbit[7]uril (CB7) as nitrogen source, 3D aromatic‐like closo ‐[B 12 H ] 2− boron source. In addition, polystyrene microspheres are added help introduce structure expose more active sites. Benefitting from structures BCN‐P has high onset potential (E =0.846 V) half‐wave 1/2 =0.74 in alkaline media. The zinc‐air battery assembled shows operating voltage (1.42 V), peak power density (128.7 mW cm −2 ) stable charge/discharge cycles, even comparable Pt/C.

Language: Английский

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Unlocking the catalytic potential of tungsten carbide coordinated with 3d transition metals in oxygen electrochemistry

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 497, P. 154145 - 154145

Published: July 27, 2024

Language: Английский

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Effective MOF-derived electrocatalysts based on nitrogen and different transient metal doped (M: Ni, Co, and Fe) for oxygen reduction reaction toward direct ethanol fuel cell

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 91, P. 1343 - 1354

Published: Oct. 22, 2024

Language: Английский

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Self-shedding MOF-nanocarriers modulated CdS/MoSe2 heterojunction activity through in-situ ion exchange: An enhanced split-type photoelectrochemical sensor for deoxynivalenol

Talanta, Journal Year: 2024, Volume and Issue: 278, P. 126464 - 126464

Published: June 27, 2024

Language: Английский

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