AI Article Synopsis

  • The study presents a method for creating a core-shell catalyst with a high-index Pt shell and a PtCu intermetallic core, enhancing the efficiency of oxygen reduction reactions without high temperatures.
  • Using surfactant effects and solvent-ligand interactions, the catalyst is formed through a self-assembly process that directly fabricates the desired structure.
  • The catalyst demonstrates a high performance with a half-wave potential of 0.911 V and maintains its effectiveness even after 15,000 cycles, largely due to improved electronic interactions that stabilize key reaction intermediates.

Article Abstract

Rational design of well-defined active sites is crucial for promoting sluggish oxygen reduction reactions. Herein, leveraging the surfactant-oriented and solvent-ligand effects, we develop a facile self-assembly strategy to construct a core-shell catalyst comprising a high-index Pt shell encapsulating a PtCu intermetallic core with efficient oxygen-reduction performance. Without undergoing a high-temperature route, the ordered PtCu is directly fabricated through the accelerated reduction of Cu, followed by the deposition of the remaining Pt precursor onto its surface, forming high-index steps oriented by the steric hindrance of surfactant. This approach results in a high half-wave potential of 0.911 V versus reversible hydrogen electrode, with negligible deactivation even after 15000-cycle operation. spectroscopies identify that this core-shell catalyst facilitates the conversion of oxygen-involving intermediates and ensures antidissolution ability. Theoretical investigations rationalize that this improvement is attributed to reinforced electronic interactions around high-index Pt, stabilizing the binding strength of rate-determining OH species.

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Source
http://dx.doi.org/10.1021/acs.nanolett.4c00111DOI Listing

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