The more the better: on the formation of single-phase high entropy alloy nanoparticles as catalysts for the oxygen reduction reaction
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The more the better : on the formation of single-phase high entropy alloy nanoparticles as catalysts for the oxygen reduction reaction. / Pittkowski, Rebecca K.; Clausen, Christian M.; Chen, Qinyi; Stoian, Dragos; Van Beek, Wouter; Bucher, Jan; Welten, Rahel L.; Schlegel, Nicolas; Mathiesen, Jette K.; Nielsen, Tobias M.; Du, Jia; Rosenkranz, Asger W.; Bøjesen, Espen D.; Rossmeisl, Jan; Jensen, Kirsten M. Ø.; Arenz, Matthias.
I: EES Catalysis, Bind 1, Nr. 6, 2023, s. 950-960.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The more the better
T2 - on the formation of single-phase high entropy alloy nanoparticles as catalysts for the oxygen reduction reaction
AU - Pittkowski, Rebecca K.
AU - Clausen, Christian M.
AU - Chen, Qinyi
AU - Stoian, Dragos
AU - Van Beek, Wouter
AU - Bucher, Jan
AU - Welten, Rahel L.
AU - Schlegel, Nicolas
AU - Mathiesen, Jette K.
AU - Nielsen, Tobias M.
AU - Du, Jia
AU - Rosenkranz, Asger W.
AU - Bøjesen, Espen D.
AU - Rossmeisl, Jan
AU - Jensen, Kirsten M. Ø.
AU - Arenz, Matthias
PY - 2023
Y1 - 2023
N2 - High entropy alloys (HEAs) are an important new material class with significant application potential incatalysis and electrocatalysis. The entropy-driven formation of HEA materials requires high temperaturesand controlled cooling rates. However, catalysts in general also require highly dispersed materials, i.e.,nanoparticles. Only then a favorable utilization of the expensive raw materials can be achieved. Severalrecently reported HEA nanoparticle synthesis strategies, therefore, avoid the high-temperature regime toprevent particle growth. In our work, we investigate a system of five noble metal single-source precursorswith superior catalytic activity for the oxygen reduction reaction. Combining in situ X-ray powderdiffraction with multi-edge X-ray absorption spectroscopy, we address the fundamental question of howsingle-phase HEA nanoparticles can form at low temperatures. It is demonstrated that the formation ofHEA nanoparticles is governed by stochastic principles and the inhibition of precursor mobility during theformation process favors the formation of a single phase. The proposed formation principle is supported bysimulations of the nanoparticle formation in a randomized process, rationalizing the experimentally founddifferences between two-element and multi-element metal precursor mixtures.
AB - High entropy alloys (HEAs) are an important new material class with significant application potential incatalysis and electrocatalysis. The entropy-driven formation of HEA materials requires high temperaturesand controlled cooling rates. However, catalysts in general also require highly dispersed materials, i.e.,nanoparticles. Only then a favorable utilization of the expensive raw materials can be achieved. Severalrecently reported HEA nanoparticle synthesis strategies, therefore, avoid the high-temperature regime toprevent particle growth. In our work, we investigate a system of five noble metal single-source precursorswith superior catalytic activity for the oxygen reduction reaction. Combining in situ X-ray powderdiffraction with multi-edge X-ray absorption spectroscopy, we address the fundamental question of howsingle-phase HEA nanoparticles can form at low temperatures. It is demonstrated that the formation ofHEA nanoparticles is governed by stochastic principles and the inhibition of precursor mobility during theformation process favors the formation of a single phase. The proposed formation principle is supported bysimulations of the nanoparticle formation in a randomized process, rationalizing the experimentally founddifferences between two-element and multi-element metal precursor mixtures.
U2 - 10.1039/D3EY00201B
DO - 10.1039/D3EY00201B
M3 - Journal article
VL - 1
SP - 950
EP - 960
JO - EES Catalysis
JF - EES Catalysis
SN - 2753-801X
IS - 6
ER -
ID: 383188112