20.500.12556/RUNG-2633
Atomically resolved dealloying of structurally ordered Pt nanoalloy as an oxygen reduction reaction electrocatalyst
The positive effect of intermetallic ordering of platinum alloy nanoparticles on oxygen reduction reaction (ORR) activity has been well established. What is still missing is an understanding of selective leaching of the less noble metal from the ordered structure and its correlation to longterm ORR performance. Using a combination of kinetic Monte Carlo simulations and advanced characterization techniques, we provide unprecedented insight into dealloying of intermetallic PtCu3 nanoparticles a well-known binary alloy. Comparison of ordered and disordered samples with identical initial compositions and particle size distributions reveals an unexpected correlation: whereas the copper dealloying rates in the ordered and disordered counterparts are almost the same, in the ordered structure Pt atoms are surrounded by 15−30% more Cu atoms throughout all the stages of acid leaching. This more convenient Pt−Cu coordination explains the statistically significant increase of 23−37% in ORR activity of the ordered structure at all stages of alloy degradation.
ORR activity
fuel cells
platinum alloy
nanoparticle stability
intermetallic ordering
kinetic Monte Carlo
dealloying
in situ ICP-MS
materiali
elektrokataliza
nanozlitine
struktura snovi
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false
Angleški jezik
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2016-09-27 11:52:00
2016-09-27 16:47:19
2023-06-09 03:17:57
0000-00-00 00:00:00
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str. 5530-5534
#iss. #8
#Vol. #6
Aug. 2016
0000-00-00
NiDoloceno
NiDoloceno
NiDoloceno
0000-00-00
0000-00-00
0000-00-00
2155-5435
518529817
10.1021/acscatal.6b00557
URN:SI:UNG:REP:HSTI1NAY
Univerza v Novi Gorici
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