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Electrochemical Stability of Platinum Nanoparticles Supported on N-Doped Hydrothermal Carbon Aerogels as Electrocatalysts for the Oxygen Reduction Reaction

Martin, Julian; Melke, Julia; Njel, Christian; Schökel, Alexander; Büttner, Jan; Fischer, Anna

Abstract (englisch):

Sustainable N-doped carbon aerogels were synthesized by a scalable hydrothermal approach using low-cost and abundant precursors such as glucose and ovalbumin. By adjusting the
pyrolysis temperature (900–1500 °C), the surface chemistry, porosity and conductivity of these aerogels could be optimized for the design of Pt-based oxygen reduction reaction (ORR) catalysts with high Pt loading (40 wt % Pt) and improved stability. Pt nanoparticle deposition was realized by wet impregnation followed by thermal reduction and their size and distribution was found to strongly depend on the surface chemistry of the carbon aerogels. The catalysts’ activities and stabilities, determined by rotating disc electrode measurements in HClO4, were found to strongly depend on the pyrolysis temperature of the N-doped carbon aerogel supports. While the mass activity decreased with increasing temperature, in line with a decreasing ECSA related to an increase in Pt nanoparticle size, the long-term stability of the catalysts, as revealed by accelerated stress tests for carbon support degradation (10,000 cycles), increased with increasing pyrolysis temperature, in line with increasing Pt nanoparticle sizes and increasing graphitization of the carbon aerogel supports. ... mehr

Postprint §
DOI: 10.5445/IR/1000141640
Veröffentlicht am 15.11.2022
DOI: 10.1002/celc.202101162
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Energiespeichersysteme (IAM-ESS)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 13.12.2021
Sprache Englisch
Identifikator ISSN: 2196-0216, 2196-0216
KITopen-ID: 1000141640
HGF-Programm 43.35.01 (POF IV, LK 01) Platform for Correlative, In Situ & Operando Charakterizat.
Erschienen in ChemElectroChem
Verlag John Wiley and Sons
Band 8
Heft 24
Seiten 4835–4847
Vorab online veröffentlicht am 14.11.2021
Schlagwörter KNMF 2020-025-029890
Nachgewiesen in Dimensions
Web of Science
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