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Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis
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Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis
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Journal Article
Fast site-to-site electron transfer of high-entropy alloy nanocatalyst driving redox electrocatalysis
2020
Overview
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.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
