Heat-Treated Aerogel as a Catalyst for the Oxygen Reduction Reaction

Noam Zion, David A. Cullen, Piotr Zelenay, Lior Elbaz

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Aerogels are fascinating materials that can be used for a wide range of applications, one of which is electrocatalysis of the important oxygen reduction reaction. In their inorganic form, aerogels can have ultrahigh catalytic site density, high surface area, and tunable physical properties and chemical structures—important features in heterogeneous catalysis. Herein, we report on the synthesis and electrocatalytic properties of an iron–porphyrin aerogel. 5,10,15,20-(Tetra-4-aminophenyl)porphyrin (H2TAPP) and FeII were used as building blocks of the aerogel, which was later heat-treated at 600 °C to enhance electronic conductivity and catalytic activity, while preserving its macrostructure. The resulting material has a very high concentration of atomically dispersed catalytic sites (9.7×1020 sites g−1) capable of catalyzing the oxygen reduction reaction in alkaline solution (Eonset=0.92 V vs. RHE, TOF=0.25 e site−1 s−1 at 0.80 V vs. RHE).

Original languageEnglish
Pages (from-to)2483-2489
Number of pages7
JournalAngewandte Chemie - International Edition
Volume59
Issue number6
DOIs
StatePublished - 3 Feb 2020

Bibliographical note

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • aerogels
  • covalent organic frameworks
  • electrocatalysis
  • oxygen reduction
  • porphyrins

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