TY - JOUR
T1 - Pt-surface stabilization by high-entropy alloys for enhancing oxygen reduction reaction property
T2 - Single-crystal model catalyst study
AU - Chida, Yoshihiro
AU - Tomimori, Takeru
AU - Todoroki, Naoto
AU - Wadayama, Toshimasa
N1 - Publisher Copyright:
© 2023
PY - 2024/2
Y1 - 2024/2
N2 - In this work, we study the oxygen reduction reaction (ORR) properties of Pt-containing 3d transition-metal high-entropy alloy (Pt-HEA) surfaces, focusing on the constituent alloying elements. The surface Pt and underlying Cr-Mn-Co-Ni(1 1 1) (Pt/Cr-Mn-Co-Ni(1 1 1)) stacked lattice layers, which are synthesized through the vacuum deposition of the underlying alloy and surface Pt stacking layers on Pt(1 1 1) substrate, exhibit high pristine ORR activity and structural stability under potential-cycle loading, compared to Pt/Cr-Co-Ni, Pt/Mn-Co-Ni, and Pt/Co-Ni(1 1 1) surfaces. The outperformed ORR properties are attributed to the effective suppression of the surface segregation of Cr. This study demonstrates that not only the “high-entropy” effect induced by increasing the numbers of constituent elements but also the “chemical affinity” of Pt and the individual HEA constituent elements determine the ORR performances of Pt-HEA.
AB - In this work, we study the oxygen reduction reaction (ORR) properties of Pt-containing 3d transition-metal high-entropy alloy (Pt-HEA) surfaces, focusing on the constituent alloying elements. The surface Pt and underlying Cr-Mn-Co-Ni(1 1 1) (Pt/Cr-Mn-Co-Ni(1 1 1)) stacked lattice layers, which are synthesized through the vacuum deposition of the underlying alloy and surface Pt stacking layers on Pt(1 1 1) substrate, exhibit high pristine ORR activity and structural stability under potential-cycle loading, compared to Pt/Cr-Co-Ni, Pt/Mn-Co-Ni, and Pt/Co-Ni(1 1 1) surfaces. The outperformed ORR properties are attributed to the effective suppression of the surface segregation of Cr. This study demonstrates that not only the “high-entropy” effect induced by increasing the numbers of constituent elements but also the “chemical affinity” of Pt and the individual HEA constituent elements determine the ORR performances of Pt-HEA.
KW - High-entropy alloys
KW - Model catalyst study
KW - Oxygen reduction reaction
KW - Platinum
KW - Surface free energy
KW - Surface segregation
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U2 - 10.1016/j.elecom.2023.107657
DO - 10.1016/j.elecom.2023.107657
M3 - Article
AN - SCOPUS:85181101267
SN - 1388-2481
VL - 159
JO - Electrochemistry Communications
JF - Electrochemistry Communications
M1 - 107657
ER -