Support Effects in Single-Atom Platinum Catalysts for Electrochemical Oxygen Reduction

Sungeun Yang, Young Joo Tak, Jiwhan Kim, Aloysius Soon, Hyunjoo Lee

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

Single-atom catalysts (SACs) provide an ideal platform for reducing noble-metal usage. SACs also exhibit unusual catalytic properties due to the absence of a metal surface. The role of the support may have a significant effect on the catalytic properties, similar to that of the ligand molecules in homogeneous catalysts. Here, the support effect was demonstrated by preparing a single-atom platinum catalyst on two different supports: titanium carbide (Pt1/TiC) and titanium nitride (Pt1/TiN). The formation of single-atom Pt was confirmed by STEM, EXAFS, and in situ IR spectroscopy. Pt1/TiC showed higher activity, selectivity, and stability for electrochemical H2O2 production than Pt1/TiN. Density functional theory calculations presented that oxygen species have strong affinity into Pt1/TiN, possibly acting as surface poisoning species, and Pt1/TiC preserves oxygen-oxygen bonds more with higher selectivity toward H2O2 production. This work clearly shows that the support in SACs actively participates in the surface reaction and does not just act as anchoring sites for single atoms.

Original languageEnglish
Pages (from-to)1301-1307
Number of pages7
JournalACS Catalysis
Volume7
Issue number2
DOIs
Publication statusPublished - 2017 Feb 3

Fingerprint

Platinum
Catalyst supports
Oxygen
Atoms
Catalysts
Titanium nitride
Titanium carbide
Surface reactions
Precious metals
Density functional theory
Infrared spectroscopy
Metals
Ligands
Molecules

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Yang, Sungeun ; Tak, Young Joo ; Kim, Jiwhan ; Soon, Aloysius ; Lee, Hyunjoo. / Support Effects in Single-Atom Platinum Catalysts for Electrochemical Oxygen Reduction. In: ACS Catalysis. 2017 ; Vol. 7, No. 2. pp. 1301-1307.
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Support Effects in Single-Atom Platinum Catalysts for Electrochemical Oxygen Reduction. / Yang, Sungeun; Tak, Young Joo; Kim, Jiwhan; Soon, Aloysius; Lee, Hyunjoo.

In: ACS Catalysis, Vol. 7, No. 2, 03.02.2017, p. 1301-1307.

Research output: Contribution to journalArticle

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