Engineered Co/Ni–N Bonds in Bimetallic Nanocomposites for Effective Oxygen Reduction Catalysts in Fuel Cells

ACS Applied Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 7, 2025

The future advancement of anion exchange membrane fuel cells (AEMFCs) relies on the development effective, durable, and economical oxygen reduction reaction (ORR) catalysts. This study introduces cost-effective, nonprecious metal electrocatalysts, specifically Co Ni-based bimetallic nanocomposites (CoNi-bpy) synthesized with 4,4′-bipyridine as N-doped carbon supports, which demonstrate significant potential to enhance ORR performance in AEMFCs. Incorporating Ni both individually combination into lattice forms Co/Ni–N bonds optimized energy, facilitating M atom insertion enhancing activity by increasing charge density difference positive cloud centers. reduces band gap maps distribution clouds catalysts, O2 adsorption, supported functional theory calculations. CoNi-bpy catalyst demonstrated electrochemical stability, a half-wave (E1/2) ∼0.76 V vs RHE, minimal voltage drop ∼20 mV even after 20,000 cycles. AEMFCs was prepared using these low-cost deliver notable peak power densities, achieving ∼94 mW cm–2 at current ∼290 mA under ambient pressure temperature. represents step toward designing an affordable highly efficient metal-based cathode electrocatalyst underscoring its effectiveness catalysis for widespread application.

Язык: Английский

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Morphological Evolution of Carbon Quantum Dots to Carbon Nanoneedles and N/F Codoping as an Efficient Catalyst for Oxygen Electrochemistry

ACS Applied Engineering Materials, Год журнала: 2024, Номер 2(7), С. 1894 - 1907

Опубликована: Июнь 28, 2024

Fuel cells have emerged as a promising alternative to conventional energy sources due their high conversion efficiency and low environmental impact. However, the development of efficient cost-effective catalysts for fuel cell electrodes remains significant challenge. Carbon quantum dots (CQDs) candidates, with unique electronic optical traits, excellent electrochemical activity, cost-effectiveness. We synthesized CQD investigated its structural transformation into carbon nanoneedles through N F codoping, employing an innovative approach enhance efficiency, particularly in field oxygen electrochemistry. This process maximizes defects, reduces band gap from 2.52 1.34 eV, enhances charge distribution lattice, which facilitates easy e– transfer, studied density functional theory analysis. Notably, N/F-CQD catalyst exhibits exceptional durability, maintaining ∼23 mV degradation after 30000 cycles, showcasing robustness prolonged operational conditions finding suitability practical applications. Moreover, peak power 90 mW cm–2 at load current ∼230 mA under ambient pressure temperature 50–55 °C, emphasizing potential nonmetallic catalyst. The introduction N/F codoping demonstrates promise enhancing behavior, paving way nonmetal cathodic reduction reaction (ORR) electrocatalyst anion-exchange membrane

Язык: Английский

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Insights into zinc-air battery technological advancements

Renewable and Sustainable Energy Reviews, Год журнала: 2024, Номер 202, С. 114675 - 114675

Опубликована: Июль 4, 2024

Язык: Английский

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Triton X-100-mediated one-pot solution phase synthesis of AuPtCo/C nanoparticles with enhanced oxygen reduction performance in fuel cells

Ionics, Год журнала: 2025, Номер unknown

Опубликована: Янв. 3, 2025

Язык: Английский

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Self‐Standing Metal Organic Framework–Carbon Nanofiber Composites as Bifunctional Electrocatalysts for Rechargeable Zinc‐Air Batteries

ChemistrySelect, Год журнала: 2025, Номер 10(11)

Опубликована: Март 1, 2025

Abstract Metal‐organic framework (MOF)–carbon composite materials are promising candidates for use as electrocatalysts in zinc‐air batteries (ZAB). Electrospun carbon nanofibers (CNFs) particularly advantageous conductive substrates due to their porous and binder‐free architecture. However, achieving stable efficient dispersion of MOFs on CNFs remains a significant challenge. In this study, we present the synthesis electrode comprising nickel‐based metal‐organic decorated over cobalt oxide‐embedded (NM@CCNF), designed self‐standing bifunctional electrocatalyst rechargeable ZABs. The NM@CCNF features unique open flower petal‐like morphology providing abundant active sites oxygen reduction (ORR) evolution reactions (OER). Electrochemical testing demonstrated that exhibited low potential gap (Δ E ) between ORR OER 0.794 V, surpassing individual noble metal catalysts rivaling benchmark Pt/C IrO₂ combinations. assembled ZAB high specific capacity 830 mA h g Zn −1 , peak power density 77.36 mW cm −2 . Long‐term cycling stability tests 200 cycles showed minimal voltage degradation, indicating excellent durability rechargeability. Post‐mortem analysis confirmed reversible formation ZnO during operation, validating battery's These findings highlight candidate next‐generation energy storage systems.

Язык: Английский

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Application of nitrogen-doped graphene-like cobalt nanoparticle composite catalysts in zinc-air batteries

Journal of Electroanalytical Chemistry, Год журнала: 2025, Номер unknown, С. 119102 - 119102

Опубликована: Апрель 1, 2025

Язык: Английский

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B-site cation sequencing in SrMnO₃ using iron for zinc–air battery electrocatalysis: a structural evaluation

Materials Chemistry Frontiers, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

An unprecedented molten salt synthesis approach was used to produce strontium manganese perovskites (ABO 3 ) and B-site substituted variants (SrMn 1− x Fe O ), which were effectively applied as electrocatalysts in zinc–air batteries.

Язык: Английский

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Fluorine-rich Schiff base ligand derived Fe/N–C–F and Co/N–C–F catalysts for the oxygen reduction reaction: synthesis, experimental validation, and DFT insights

Sustainable Energy & Fuels, Год журнала: 2024, Номер unknown

Опубликована: Янв. 1, 2024

Featuring a fully optimized Fe/N–C–F catalyst, the full-cell mechanism demonstrates superior activity and stability for oxygen reduction reaction (ORR).

Язык: Английский

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Triton X-100 Mediated One-pot Solution Phase Synthesis of Au@PtCo/C Nanoparticles with Enhanced Oxygen Reduction Performance in Fuel Cells

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Сен. 2, 2024

Au doped PtCo/C (Au@PtCo/C) as an oxygen reduction reaction (ORR) catalyst is synthesized using a facile single step solution phase synthesis method with Triton X-100 mediator guiding the shape and size of metal nanoparticles. The spherical shaped nanoparticles 2–4 nm were uniformly dispersed over porous carbon support accounting for electrochemical active surface area (ECSA) 52 m²/g_Pt. It was observed that at 0.9V, mass activity (I_m) Au@PtCo/C 0.57 A/mg_Pt which 4 times higher in relation to commercial Pt/C catalyst. While evaluating real time PEMFC configuration under acidic environment, this delivers peak power density 1.33 W/cm² current 3.43 A/cm² H₂/O₂ feeds ambient pressure, thus emerging promising electrocatalyst fuel cell applications.

Язык: Английский

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