Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis

Designing electrocatalysts with high-performance for both reduction and oxidation reactions faces severe challenges. Here, the uniform and ultrasmall (~3.4 nm) high-entropy alloys (HEAs) Pt 18 Ni 26 Fe 15 Co 14 Cu 27 nanoparticles are synthesized by a simple low-temperature oil phase strategy at atm...

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Bibliographic Details
Published in:Nature communications 2020-10, Vol.11 (1), p.5437-5437, Article 5437
Main Authors: Li, Hongdong, Han, Yi, Zhao, Huan, Qi, Wenjing, Zhang, Dan, Yu, Yaodong, Cai, Wenwen, Li, Shaoxiang, Lai, Jianping, Huang, Bolong, Wang, Lei
Format: Article
Language:English
Subjects:
639/301/299/886
639/638/563/979
639/638/77/884
639/925/357/354
Alloys
Catalysts
Electrocatalysts
Electron transfer
Entropy
High entropy alloys
Humanities and Social Sciences
Hydrogen evolution reactions
Low temperature
Methanol
multidisciplinary
Nanoalloys
Nanocatalysis
Nanoparticles
Oxidation
Redox reactions
Reduction
Science
Science (multidisciplinary)
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Summary:Designing electrocatalysts with high-performance for both reduction and oxidation reactions faces severe challenges. Here, the uniform and ultrasmall (~3.4 nm) high-entropy alloys (HEAs) Pt 18 Ni 26 Fe 15 Co 14 Cu 27 nanoparticles are synthesized by a simple low-temperature oil phase strategy at atmospheric pressure. The Pt 18 Ni 26 Fe 15 Co 14 Cu 27 /C catalyst exhibits excellent electrocatalytic performance for hydrogen evolution reaction (HER) and methanol oxidation reaction (MOR). The catalyst shows ultrasmall overpotential of 11 mV at the current density of 10 mA cm −2 , excellent activity (10.96 A mg −1 Pt at −0.07 V vs. reversible hydrogen electrode) and stability in the alkaline medium. Furthermore, it is also the efficient catalyst (15.04 A mg −1 Pt ) ever reported for MOR in alkaline solution. Periodic DFT calculations confirm the multi-active sites for both HER and MOR on the HEA surface as the key factor for both proton and intermediate transformation. Meanwhile, the construction of HEA surfaces supplies the fast site-to-site electron transfer for both reduction and oxidation processes. The design of nanostructured catalysts plays a key role in the electrocatalytic redox reaction performances. Here, authors prepared uniform and small-sized high-entropy alloy PtNiFeCoCu nanoparticles that showed improved activities for H 2 evolution methanol oxidation reactions.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-19277-9