The Potential-Dependent Structure of Pt 3 Ni Alloy Electrocatalysts and Its Effect on Electrocatalytic Activity
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide The distribution of elements within alloy nanoparticles is a critical parameter for their electrocatalytic performance. Here, we use the case of a Pt 3 Ni alloy to show that this elemental distribution can dynamically respond to the applied potential, leading to strongly potential-dependent catalytic properties. Starting from the Pt 3 Ni core and Pt shell structure that forms in acid electrolyte due to Ni leaching, our electrochemical X-ray photoelectron spectroscopy measurements show that the Ni atoms can be reversibly moved between the core of the particles and the near-surface region using the applied potential. Through potential jump measurements, we show that this Ni migration modulates the hydrogen evolution reaction activity of the particles by over 30%. These observations highlight the potential of incorporating in situ restructuring of alloys as the final step in electrocatalyst design.
Source: ACS Catalysis
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G1009992818, Netherlands Electron Microscopy Infrastructure (NEMI), Advanced operando spectroscopies for atomic-scale insight into the electrocatalysis of fuel cells and electrolyzers, From fundamental knowledge to advanced catalytic materials for proton-exchange membrane fuel cell: Operando studies
OpenAlex ID: W4412466541