TY - JOUR
T1 - The Potential-Dependent Structure of Pt3Ni Alloy Electrocatalysts and Its Effect on Electrocatalytic Activity
AU - Javed, Hassan
AU - Kolmeijer, Kees
AU - Deka, Nipon
AU - van Spronsen, Matthijs A.
AU - van Huis, Marijn A.
AU - Sandhya, Athira Lekshmi Mohandas
AU - Khalakhan, Ivan
AU - Mom, Rik V.
N1 - Publisher Copyright:
© 2025 The Authors. Published by American Chemical Society
PY - 2025/8/1
Y1 - 2025/8/1
N2 - The distribution of elements within alloy nanoparticles is a critical parameter for their electrocatalytic performance. Here, we use the case of a Pt3Ni alloy to show that this elemental distribution can dynamically respond to the applied potential, leading to strongly potential-dependent catalytic properties. Starting from the Pt3Ni 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.
AB - The distribution of elements within alloy nanoparticles is a critical parameter for their electrocatalytic performance. Here, we use the case of a Pt3Ni alloy to show that this elemental distribution can dynamically respond to the applied potential, leading to strongly potential-dependent catalytic properties. Starting from the Pt3Ni 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.
KW - Alloy electrocatalyst
KW - Platinum-nickel electrocatalyst
KW - Spectro-electrochemistry
KW - X-ray absorption spectroscopy
KW - X-ray photoelectron spectroscopy
UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=d7dz6a2i7wiom976oc9ff2iqvdhv8k5x&SrcAuth=WosAPI&KeyUT=WOS:001530028200001&DestLinkType=FullRecord&DestApp=WOS_CPL
U2 - 10.1021/acscatal.5c02601
DO - 10.1021/acscatal.5c02601
M3 - Article
SN - 2155-5435
VL - 15
SP - 12994
EP - 13002
JO - ACS Catalysis
JF - ACS Catalysis
IS - 15
ER -