Cost-effective ion-tuning of Birnessite structures for efficient ORR electrocatalysts

Altantuya Ochirkhuyag, Tamás Varga, Ildikó Y. Tóth, Ágnes Tímea Varga, András Sápi, Ákos Kukovecz, Zoltán Kónya

Research output: Article

Abstract

Birnessite structured MnOx with tuned potassium, copper and water content in the interlayer spacing is produced by a simple and cost-effective method. The new structures are investigated by XRD, Raman spectroscopy, SEM, EDX, HRTEM, DLS, TG, and DSC. Our study demonstrates a successful intercalation process to produce birnessites with mixed interlayer cations. Both Birnessite and Cu2+/Birnessite structure have a nanosheet-like morphology where the sizes of the copper-treated birnessite nanoparticles are drastically decreased compared to the copper ion free structures. The specific surface area is increased from 21.6 m2/g to 77.8 m2/g in the presence of copper as a result of a longer ageing process. Our study reveals that the electron transfer numbers of Birnessite and Cu2+/Birnessite are about 3.40 and 3.65, respectively in the oxygen reduction reaction. Both as-synthesized pristine Birnessite and copper tuned Birnessite are a promising candidate for a cheap, noble metal-free electrocatalyst for fuel cell applications.

Original languageEnglish
Pages (from-to)16266-16276
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number32
DOIs
Publication statusPublished - jún. 11 2020

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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