Integrating PtCo Intermetallic with Highly Graphitized Carbon Toward Durable Oxygen Electroreduction in Proton Exchange Membrane Fuel Cells

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

Published: Feb. 11, 2025

Abstract Exploiting robust and high‐efficiency electrocatalysts for sluggish oxygen reduction reaction (ORR) is essential proton exchange membrane fuel cells (PEMFCs) toward long‐term operation practical applications, yet remains challenging. Herein, the ordered PtCo intermetallic reported with a Pt‐rich shell loaded on highly graphitized carbon carrier (O‐PtCo@GCoNC) prepared by an impregnation annealing strategy. Systematic X‐ray spectroscopic, operando electrochemical techniques theoretical calculations reveal that thanks to synergistic interaction of core–shell structure tailor‐made Pt electronic configuration carbon, O‐PtCo@GCoNC exhibits significantly enhanced activity stability ORR. Crucially, delivers much‐enhanced mass 0.83 A mg −1 at 0.9 V versus reversible hydrogen electrode (RHE) in 0.1 m HClO 4 , which only drops 26.5% after 70 000 cycles (0.6–1.0 vs RHE), 10.8% 10 (1.0–1.5 apparently overmatching Pt/C (0.19 73.7%, 63.1%). Moreover, employed as cathode catalyst H 2 /air PEMFC achieves superb peak power density (1.04 W cm −2 2.06 ), outperforming (0.86 1.79 ). The cell voltage loss 0.8 28 mV 30 cycles, outstripping United States Department Energy 2025 target.

Language: Английский

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Halloysite-templated hydrophilic carbon tubes wrapped with FeNi3 for the acceleration of electrocatalytic nitrate reduction to ammonia

Fuel, Journal Year: 2025, Volume and Issue: 392, P. 134896 - 134896

Published: March 3, 2025

Language: Английский

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Management of Platinum Electronic States through Metal Host–Guest Interactions for Enhanced Oxygen Reduction

Precision Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 3, 2025

Language: Английский

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Low‐Coordinated Ni Single Atom Catalyst with Carbon Coordination for Efficient CO₂ Electroreduction

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

Published: March 21, 2025

Abstract In essence, electrocatalytic CO 2 reduction reaction (CO RR) process for the ‐to‐CO conversion involves two critical reactive intermediates: *COOH and *CO. The trade‐off between adsorption of desorption *CO is challenging Ni‐based RR catalysts. high‐valence Ni site inadequate in supplying sufficient electrons activation subsequent *COOH; conversely, metallic with abundant electron exhibits excessively strong π‐backbonding *CO, thus hindering its desorption. Here, study reports a low‐coordinated single atom catalyst (SAC) characterized by structure carbon coordination, thereby engineering moderate depletion at sites. This SAC achieves high selectivity production up to 99.1% H‐cell. Additionally, it maintains an ultrahigh near 100% across broad range current densities flow cell, coupled sustained stability large 250 mA cm −2 20 h. Both situ characterization results density functional theory (DFT) calculations confirm dual functionality this structure, as enhances while concurrently facilitating greatly promoting overall process.

Language: Английский

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Integrating Pt–Co Nanoalloy and Sulfur-Doped Co–N–C to Construct Oxygen Reduction Reaction Catalysts for Proton Exchange Membrane Fuel Cells

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

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Regulating catalyst and ionomer interactions to promote oxygen transport in fuel cells

Applied Catalysis B Environment and Energy, Journal Year: 2024, Volume and Issue: unknown, P. 124894 - 124894

Published: Nov. 1, 2024

Language: Английский

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