Investigating the activity enhancement on PtxCo1-x alloys induced by a combined strain and ligand effect

Ioannis Spanos; Jacob Judas Kain Kirkensgaard; Kell Mortensen; Matthias Arenz

doi:10.1016/j.jpowsour.2013.07.023

Investigating the activity enhancement on Pt_xCo_1-x alloys induced by a combined strain and ligand effect

Ioannis Spanos, Jacob Judas Kain Kirkensgaard, Kell Mortensen, Matthias Arenz

24 Citations (Scopus)

Abstract

Due to their high activity for the oxygen reduction reaction (ORR), Pt based alloys are of considerable interest as catalysts for polymer electrolyte fuel cells (PEMFC). We present two synthesis protocols that give Pt _xCo_1-x alloy nanoparticles (NPs) supported on a commercial carbon black support (Ketjen black EC300J) with controlled particle size, Co content and particle distribution for oxygen reduction reaction (ORR). The as prepared catalysts samples can be pre-leached in acid solution to obtain skeleton NPs and heat-treated in a reducing atmosphere to promote alloying as well as to reduce the number of low coordinated surface sites of the NPs. Without heat treatment, the catalysts exhibit an activity increase for the oxygen reduction reaction mainly due to a strain effect, whereas an improved performance due to a combined strain and ligand effect requires thermal treatment of the catalyst.

Original language	English
Journal	Journal of Power Sources
Volume	245
Pages (from-to)	908-914
Number of pages	7
ISSN	0378-7753
DOIs	https://doi.org/10.1016/j.jpowsour.2013.07.023
Publication status	Published - 2014

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10.1016/j.jpowsour.2013.07.023

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title = "Investigating the activity enhancement on PtxCo1-x alloys induced by a combined strain and ligand effect",

abstract = "Due to their high activity for the oxygen reduction reaction (ORR), Pt based alloys are of considerable interest as catalysts for polymer electrolyte fuel cells (PEMFC). We present two synthesis protocols that give Pt xCo1-x alloy nanoparticles (NPs) supported on a commercial carbon black support (Ketjen black EC300J) with controlled particle size, Co content and particle distribution for oxygen reduction reaction (ORR). The as prepared catalysts samples can be pre-leached in acid solution to obtain skeleton NPs and heat-treated in a reducing atmosphere to promote alloying as well as to reduce the number of low coordinated surface sites of the NPs. Without heat treatment, the catalysts exhibit an activity increase for the oxygen reduction reaction mainly due to a strain effect, whereas an improved performance due to a combined strain and ligand effect requires thermal treatment of the catalyst.",

author = "Ioannis Spanos and Kirkensgaard, {Jacob Judas Kain} and Kell Mortensen and Matthias Arenz",

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T1 - Investigating the activity enhancement on PtxCo1-x alloys induced by a combined strain and ligand effect

AU - Spanos, Ioannis

AU - Kirkensgaard, Jacob Judas Kain

AU - Mortensen, Kell

AU - Arenz, Matthias

PY - 2014

Y1 - 2014

N2 - Due to their high activity for the oxygen reduction reaction (ORR), Pt based alloys are of considerable interest as catalysts for polymer electrolyte fuel cells (PEMFC). We present two synthesis protocols that give Pt xCo1-x alloy nanoparticles (NPs) supported on a commercial carbon black support (Ketjen black EC300J) with controlled particle size, Co content and particle distribution for oxygen reduction reaction (ORR). The as prepared catalysts samples can be pre-leached in acid solution to obtain skeleton NPs and heat-treated in a reducing atmosphere to promote alloying as well as to reduce the number of low coordinated surface sites of the NPs. Without heat treatment, the catalysts exhibit an activity increase for the oxygen reduction reaction mainly due to a strain effect, whereas an improved performance due to a combined strain and ligand effect requires thermal treatment of the catalyst.

AB - Due to their high activity for the oxygen reduction reaction (ORR), Pt based alloys are of considerable interest as catalysts for polymer electrolyte fuel cells (PEMFC). We present two synthesis protocols that give Pt xCo1-x alloy nanoparticles (NPs) supported on a commercial carbon black support (Ketjen black EC300J) with controlled particle size, Co content and particle distribution for oxygen reduction reaction (ORR). The as prepared catalysts samples can be pre-leached in acid solution to obtain skeleton NPs and heat-treated in a reducing atmosphere to promote alloying as well as to reduce the number of low coordinated surface sites of the NPs. Without heat treatment, the catalysts exhibit an activity increase for the oxygen reduction reaction mainly due to a strain effect, whereas an improved performance due to a combined strain and ligand effect requires thermal treatment of the catalyst.

U2 - 10.1016/j.jpowsour.2013.07.023

DO - 10.1016/j.jpowsour.2013.07.023

M3 - Journal article

SN - 0378-7753

VL - 245

SP - 908

EP - 914

JO - Journal of Power Sources

JF - Journal of Power Sources

ER -

Investigating the activity enhancement on PtxCo1-x alloys induced by a combined strain and ligand effect

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Investigating the activity enhancement on Pt_xCo_1-x alloys induced by a combined strain and ligand effect