Research Progress and Perspectives on Anti‐Poisoning Hydrogen Oxidation Reaction Electrocatalysts for Hydrogen Fuel Cells

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 5, 2025

Abstract As global demand for clean and sustainable energy continues to rise, fuel cell technology has seen rapid advancement. However, the presence of trace impurities like carbon monoxide (CO) hydrogen sulfide (H₂S) in can significantly deactivate anode by blocking its active sites, leading reduced performance. Developing electrocatalysts that are resistant CO H₂S poisoning therefore become a critical priority. This paper provides comprehensive analysis mechanisms reviews key strategies developed over past few decades enhance impurity tolerance electrocatalysts. It begins examining differences oxidation reaction (HOR) acidic alkaline environments, focusing on roles binding (HBE) hydroxide (OHBE). Next, it outlines three main approaches mitigate poisoning: (I) bifunctional mechanisms, (II) direct (III) constructing protective layers. The review then shifts countering poisoning, emphasizing both electrocatalyst design structural improvements cells. Finally, highlights recent advances anti‐poisoning electrocatalysts, discusses their applications limitations, identifies challenges future opportunities further research this field.

Language: Английский

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Manipulating Oxygen Reduction Mechanisms of Platinum with Nonmetallic Phosphorus and Metallic Copper Synergistic Alloying

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract Alloying of platinum (Pt) nanostructures with heteroelements, commonly including transition‐metals and nonmetals, is an effective strategy to improve the electrocatalytic performance for oxygen reduction reaction (ORR). However, distinct mechanisms by which metal/nonmetal alloying improves ORR activity remain unclear. Herein, based on successful porous network Pt nanospheres (NSs) metallic copper (Cu) non‐metallic phosphorus (P) systematically integrating electrochemical tests, density functional theory calculations, in situ Raman spectroscopy, this study reveals that internal Cu‐alloying responsible modulating binding strength oxygenated intermediates lower free energy barrier potential‐determining step (PDS) along associative mechanism, while further surface P‐alloying can transform pathway dissociative PDS has a quite low barrier. As result, carbon‐supported P/Cu co‐alloyed (P‐PtCu NSs /C) catalyst synthesized confinement growth post‐phosphorization demonstrates excellent stability compared commercial Pt/C both half‐cells proton exchange membrane fuel cells. In particular, hydrogen (H 2 )‐oxygen (O ) single cell P‐PtCu /C as cathode achieves high mass 0.52 A mg −1 at voltage 0.90 V, surpassing U.S. Department Energy's current target.

Language: Английский

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The Key Role of the Second Material's OER Activity on MOR Durability Enhancement of the Pt Alloys

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2024, Volume and Issue: 705, P. 135702 - 135702

Published: Nov. 4, 2024

Language: Английский

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Platinum nanocrystals confined into 3D porous cerium oxide nanosheet/reduced graphene oxide networks for methanol electrooxidation

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2024, Volume and Issue: unknown, P. 136032 - 136032

Published: Dec. 1, 2024

Language: Английский

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