Article open access publication

Ir nanoparticles with ultrahigh dispersion as oxygen evolution reaction (OER) catalysts: synthesis and activity benchmarking

Catalysis Science & Technology, Royal Society of Chemistry (RSC), ISSN 2044-4761

Volume 9, 22, 2019

DOI:10.1039/c9cy01728c, Dimensions: pub.1121557700,

Authors

Bizzotto, Francesco (1) (2) (3) (4)
Quinson, Jonathan (5) (6) (7) (8)
Zana, Alessandro (1) (2) (3) (4)
Kirkensgaard, Jacob J. K. (7) (8) (9) (10)
Dworzak, Alexandra (11) (12) (13) (14) (15)
Oezaslan, Mehtap (11) (12) (13) (14) (15)
Arenz, Matthias (1) (2) (3) (4)

Affiliations

Organisations

  1. (1) CH-3012 Bern
  2. (2) Department of Chemistry and Biochemistry
  3. (3) Switzerland
  4. (4) University of Bern, grid.5734.5
  5. (5) 2100 Copenhagen ├ś
  6. (6) Chemistry Department
  7. (7) Denmark
  8. (8) University of Copenhagen, grid.5254.6, KU
  9. (9) 1958 Frederiksberg C
  10. (10) Department of Food Science
  11. (11) 26111 Oldenburg
  12. (12) Carl von Ossietzky Universit├Ąt
  13. (13) Department of Chemistry
  14. (14) Germany
  15. (15) School of Mathematics and Science

Countries

Switzerland

Denmark

Continents

Europe

Description

In this work, we present a facile and straightforward approach to synthesize, activate and benchmark small, i.e. 1.6 nm in diameter, Ir nanoparticles (NP) as oxygen evolution reaction (OER) catalysts.

In this work, we present a facile and straightforward approach to synthesize, activate and benchmark small, i.e. 1.6 nm in diameter, Ir nanoparticles (NP) as oxygen evolution reaction (OER) catalysts. It is shown that the Ir NP, although oxidized after synthesis and drying, can be electrochemically reduced allowing determination of the electrochemically active surface area by CO stripping. Subsequently, an activation protocol is applied forming catalytically active Ir-oxide NP. This oxide formation is shown to be largely irreversible. It is then demonstrated that the activated Ir NP synthesized via our recently introduced colloidal method exhibit extremely high OER activities when normalized to their Ir mass. These high OER activities are related to superior dispersion as compared to state-of-the-art OER catalysts reported in the literature.

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