Enhanced Electrocatalysts for Oxygen Reduction Reaction: Insights from Accelerated Stress Testing and IL-TEM Analysis.

Angelina S Pavlets, Elizaveta A Moguchikh, Ilya V Pankov, Yana V Astravukh, Sergey V Belenov, Anastasia A Alekseenko

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Article in Nanomaterials (Basel, Switzerland), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Angelina S PavletsFaculty of Chemistry, Southern Federal University, 7 Zorge St., Rostov-on-Don 344090, Russia.ORCID 0000-0003-3450-1981

Elizaveta A MoguchikhFaculty of Chemistry, Southern Federal University, 7 Zorge St., Rostov-on-Don 344090, Russia.ORCID 0000-0002-3216-3045

Ilya V PankovResearch Institute of Physical Organic Chemistry, Southern Federal University, 194/2 Stachki St., Rostov-on-Don 344090, Russia.ORCID 0000-0001-5302-4792

Yana V AstravukhFaculty of Chemistry, Southern Federal University, 7 Zorge St., Rostov-on-Don 344090, Russia.

Sergey V BelenovFaculty of Chemistry, Southern Federal University, 7 Zorge St., Rostov-on-Don 344090, Russia.ORCID 0000-0003-2980-7089

Anastasia A AlekseenkoFaculty of Chemistry, Southern Federal University, 7 Zorge St., Rostov-on-Don 344090, Russia.ORCID 0000-0001-7948-0948

Funding

Russian Science Foundation 24-79-10162

6 · The paper itself

Abstract

This report introduces a high-performance bimetallic electrocatalyst for the oxygen reduction reaction (ORR) featuring a 20 wt.% platinum content. The PtCu-based catalyst combines de-alloyed nanoparticles (NPs) supported on nitrogen-doped carbon. Enhanced uniformity in NP distribution significantly boosts the catalyst performance. Nitrogen-doped carbon provides active centers for NP deposition, which is confirmed by HAADF-STEM and EDX. The PtCu/CN catalyst achieves over 5.6 times the ORR mass activity and two times the stability under pulse cycling compared to commercial Pt/C. Uniquely, the study examines bimetallic NPs and local nano-sites before and after stress testing using IL-TEM. In situ analysis of PtCu/CN microstructure revealed two primary degradation mechanisms, (i) partial dissolution of NPs and (ii) NP agglomeration, with the C-N support significantly mitigating these effects through strong NP-support interactions. The findings underscore the prospects of bimetallic PtCu catalysts with nitrogen-doped support by showcasing exceptional ORR activity and durability.

Indexed as

accelerated stress testde-alloyed structureelectrocatalystsidentical location transmission electron microscopynitrogen-doped carbonORRPtCu nanoparticles

Identifiers

PMID40423166

DOI10.3390/nano15100776

PMCPMC12114201

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