Synthesis of Nitrogen‐Doped Platinum–Neodymium Nanoalloy Catalyst by Liquid‐Phase Reduction for Oxygen Reduction Reaction

Advanced Sustainable Systems, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Abstract Proton exchange membrane fuel cells (PEMFCs) have attracted significant research interest due to their ability generate only water and energy. PEMFCs operate based on the principle of redox reactions, which require a catalyst for individual half‐reactions. However, commonly used platinum (Pt)‐based catalysts are expensive, performance needs enhancement. In this study, an effective strategy is presented preparing Pt–rare earth nanoalloy catalysts, achieving improvements in catalytic while reducing costs. Additionally, through urea modification, novel carbon carrier (XC‐72) successfully developed, widely utilized as support cells. The Pt–Nd@HCN‐400 synthesized by combining newly developed with Pt–Nd alloy. Under standard cell operating conditions, exhibited 5% increase durability compared its unmodified counterpart. This study offers promising approach enhancing PEMFC catalysts.

Language: Английский

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Alleviating O-Intermediates Adsorption Strength over PdRhCu Ternary Metallene via Ligand Effect for Enhanced Oxygen Reduction in Practical PEMFCs

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 1899 - 1908

Published: Feb. 17, 2025

Expediting the torpid kinetics of acidic oxygen reduction reaction (ORR) is a crucial yet formidable challenge toward advancing proton exchange membrane fuel cells (PEMFCs) for commercialization. The cutting-edge Pd-based nanomaterials ORR are hindered by their low intrinsic activities and significant CO poisoning, stemming from simultaneously optimizing surface adsorption various adsorbates. Herein, we introduce an ultrathin PdRhCu ternary metallene (PdRhCu metallene) boosting in PEMFC. Mechanistic studies have identified that incorporation Cu into PdRh configuration could downshift d-band center on Pd to promote weakened key intermediates, ensuring efficient electron transfer between metal sites adsorbates, thereby lowering energy barriers rate-determining step ORR. As proof-of-concept, optimized demonstrates impressive performance with high half-wave potential (0.93 VRHE), negligible activity decay after 10 000 cycles, superior anti-CO-poisoning capacity compared counterparts commercial Pt/C catalysts. Intriguingly, metallene-assembled PEMFC achieves maximum power density 820 mW cm–2 electrocatalytic stability under H2/air conditions, paving avenues further advancements electrocatalyst engineering practical implementation PEMFCs.

Language: Английский

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Weakening O-Intermediates Adsorption Strength Over the Pd Metallene via Lewis-Acidic Site Modulation for Enhanced Oxygen Reduction

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

The reasonable design and modulation of the electronic properties Pd metallene are acknowledged as a promising avenue for enhancing oxygen reduction reaction (ORR) in anion exchange membrane fuel cells (AEMFCs), yet they remain formidable challenge. Herein, thin-sheet structure Zr-doped (PdZr metallene) with abundant defects is proposed using facile wet-chemical approach efficient highly durable ORR electrocatalysis. Multiple microstructural analyses uncover that orchestrated oxophilic regulation PdZr via Lewis-acidic Zr site could concurrently optimize configuration Pd, downshift d-band center and, thus, promote intrinsic activity. Benefiting from unique two-dimensional morphology optimization facilitated by coupling effect, resultant demonstrates significantly enhanced electrocatalytic performance basic solutions, high half-wave potential (

Language: Английский

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Optimizing the O-intermediates' chemisorption behavior of Pd metallene via cation doping enables a highly efficient oxygen reduction in PEMFCs

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(10)

Published: Sept. 2, 2024

Modulating the electronic structure and O-intermediates' chemisorption behavior of Pd metallene with boosted oxygen reduction reaction (ORR) performance is critical to advance proton exchange membrane fuel cells (PEMFCs). Herein, Hf doping (Hf-Pd metallene) developed for efficient ORR electrocatalysis. Multiple characterizations theoretical simulations disclose that dopant located in inner atomic layers Hf-Pd could modulate configuration Pd, lower binding energies d-band centers toward O-related intermediates, deliver a much reduced overpotential during O* hydrogenation into OH*, thus enhance catalytic activity. Consequently, delivers superior electrocatalytic activity together excellent stability, surpassing commercial Pt/C various advanced Pd-based catalysts. Encouragingly, when utilized as cathode PEMFC, achieved higher maximum power density (722.75 mW cm−2) compared Pt/C-based batteries, elucidating practical application PEMFCs.

Language: Английский

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Fabrication and Characterization of Pt-Pr6O11 Nano Cathode Electrode for Polymer Electrolyte Membrane Fuel Cells via Co-Sputtering Method

Sustainability, Journal Year: 2024, Volume and Issue: 17(1), P. 198 - 198

Published: Dec. 30, 2024

In this study, the performance and durability of polymer electrolyte membrane fuel cells (PEMFCs) were improved using a Pt-Pr6O11 composite electrode fabricated through co-sputtering technique. Platinum (Pt), widely used as catalyst material in PEMFCs, often faces stability issues under various electrical load conditions. These require greater efforts to enhance PEMFC durability. Various approaches, including replacement supports with electrically stable materials (such metal oxides) or adoption core-shell alloy structures stabilize Pt, have been attempted. research, thin film combining Pr6O11 Pt was fabricated. Pr6O11, lanthanide oxide, enhances oxygen reduction reaction (ORR) strong interactions its multi-valence state contributes Scanning electron microscopy (SEM) X-ray photoelectron spectroscopy (XPS) employed analyze composition, morphology, chemical characteristics electrodes. I-V curves electrochemical impedance spectroscopies (EIS) measured evaluate properties cells. A cyclic voltammetry (CV) test conducted calculate surface area cell. As result, incorporation pristine cell by 7.6% increased after degradation testing 121% compared Pt-only cases. This demonstrates effectiveness enhancing both initial PEMFCs.

Language: Английский

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