Synthesis of Pt-Rare Earth Metal Nanoalloys

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Chemical synthesis of platinum-rare earth metal (Pt-RE) nanoalloys, one of the most active catalysts for the oxygen re-duction reaction, has been a formidable challenge, mainly due to the vastly different standard reduction potentials of the two metals and high oxophilicity of the latter. Here we report a universal chemical process to prepare Pt-RE nanoalloys with tunable compositions and particle sizes. Pt and RE metal ions from the most common hydrated metal salts are first atomically embedded into an in-situ formed C-N network, yielding a stable compound insensitive to O2 and H2O. The Pt-RE nanoalloys are subsequently obtained by heating the compound under a mild reducing atmosphere (e.g. 3.3% H2/Ar). The key intermediate step of the process is the formation of RE carbodiimides (RE2(CN2)3) along with Pt particles. This synthesis mechanism suggests an efficient strategy to prepare nanoalloys with highly reactive metals.
Original languageEnglish
JournalJournal of the American Chemical Society
Volume142
Issue number2
Pages (from-to)953-961
ISSN0002-7863
DOIs
Publication statusPublished - 2020

Keywords

  • Rare earth metal, Platinum
  • Alloy
  • Nanoparticle
  • Catalyst
  • Oxygen reduction

Cite this

@article{3a045c6bad0e4dcbb01d24477a5eb3b3,
title = "Synthesis of Pt-Rare Earth Metal Nanoalloys",
abstract = "Chemical synthesis of platinum-rare earth metal (Pt-RE) nanoalloys, one of the most active catalysts for the oxygen re-duction reaction, has been a formidable challenge, mainly due to the vastly different standard reduction potentials of the two metals and high oxophilicity of the latter. Here we report a universal chemical process to prepare Pt-RE nanoalloys with tunable compositions and particle sizes. Pt and RE metal ions from the most common hydrated metal salts are first atomically embedded into an in-situ formed C-N network, yielding a stable compound insensitive to O2 and H2O. The Pt-RE nanoalloys are subsequently obtained by heating the compound under a mild reducing atmosphere (e.g. 3.3{\%} H2/Ar). The key intermediate step of the process is the formation of RE carbodiimides (RE2(CN2)3) along with Pt particles. This synthesis mechanism suggests an efficient strategy to prepare nanoalloys with highly reactive metals.",
keywords = "Rare earth metal, Platinum, Alloy, Nanoparticle, Catalyst, Oxygen reduction",
author = "Yang Hu and Jensen, {Jens Oluf} and Cleemann, {Lars Nilausen} and Brandes, {Benedikt Axel} and Qingfeng Li",
year = "2020",
doi = "10.1021/jacs.9b10813",
language = "English",
volume = "142",
pages = "953--961",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "ACS Publications",
number = "2",

}

Synthesis of Pt-Rare Earth Metal Nanoalloys. / Hu, Yang; Jensen, Jens Oluf; Cleemann, Lars Nilausen; Brandes, Benedikt Axel; Li, Qingfeng.

In: Journal of the American Chemical Society, Vol. 142, No. 2, 2020, p. 953-961.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Synthesis of Pt-Rare Earth Metal Nanoalloys

AU - Hu, Yang

AU - Jensen, Jens Oluf

AU - Cleemann, Lars Nilausen

AU - Brandes, Benedikt Axel

AU - Li, Qingfeng

PY - 2020

Y1 - 2020

N2 - Chemical synthesis of platinum-rare earth metal (Pt-RE) nanoalloys, one of the most active catalysts for the oxygen re-duction reaction, has been a formidable challenge, mainly due to the vastly different standard reduction potentials of the two metals and high oxophilicity of the latter. Here we report a universal chemical process to prepare Pt-RE nanoalloys with tunable compositions and particle sizes. Pt and RE metal ions from the most common hydrated metal salts are first atomically embedded into an in-situ formed C-N network, yielding a stable compound insensitive to O2 and H2O. The Pt-RE nanoalloys are subsequently obtained by heating the compound under a mild reducing atmosphere (e.g. 3.3% H2/Ar). The key intermediate step of the process is the formation of RE carbodiimides (RE2(CN2)3) along with Pt particles. This synthesis mechanism suggests an efficient strategy to prepare nanoalloys with highly reactive metals.

AB - Chemical synthesis of platinum-rare earth metal (Pt-RE) nanoalloys, one of the most active catalysts for the oxygen re-duction reaction, has been a formidable challenge, mainly due to the vastly different standard reduction potentials of the two metals and high oxophilicity of the latter. Here we report a universal chemical process to prepare Pt-RE nanoalloys with tunable compositions and particle sizes. Pt and RE metal ions from the most common hydrated metal salts are first atomically embedded into an in-situ formed C-N network, yielding a stable compound insensitive to O2 and H2O. The Pt-RE nanoalloys are subsequently obtained by heating the compound under a mild reducing atmosphere (e.g. 3.3% H2/Ar). The key intermediate step of the process is the formation of RE carbodiimides (RE2(CN2)3) along with Pt particles. This synthesis mechanism suggests an efficient strategy to prepare nanoalloys with highly reactive metals.

KW - Rare earth metal, Platinum

KW - Alloy

KW - Nanoparticle

KW - Catalyst

KW - Oxygen reduction

U2 - 10.1021/jacs.9b10813

DO - 10.1021/jacs.9b10813

M3 - Journal article

C2 - 31865700

VL - 142

SP - 953

EP - 961

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 2

ER -