Co@Co3O4 Encapsulated in Carbon Nanotube-Grafted Nitrogen-Doped Carbon Polyhedra as an Advanced Bifunctional Oxygen Electrode

Efficient reversible oxygen electrodes for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are vitally important for various energy conversion devices, such as regenerative fuel cells and metal–air batteries. However, realization of such electrodes is impeded by insu...

Celý popis

Uloženo v:

Podrobná bibliografie
Vydáno v:	Angewandte Chemie International Edition Ročník 55; číslo 12; s. 4087 - 4091
Hlavní autoři:	Aijaz, Arshad, Masa, Justus, Rösler, Christoph, Xia, Wei, Weide, Philipp, Botz, Alexander J. R., Fischer, Roland A., Schuhmann, Wolfgang, Muhler, Martin
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Germany Blackwell Publishing Ltd 14.03.2016 Wiley Subscription Services, Inc
Vydání:	International ed. in English
Témata:	Atmosphere Carbon Carbon nanotubes Catalysts Chemical reduction Cobalt Cobalt oxides Devices Direct power generation EGR-1 protein Electrodes Energy Energy conversion Evolution Fuel cells Fuels heterogeneous catalysts Metal air batteries metal nanoparticles Nanoparticles nanostructured materials Nitrogen Overvoltage Oxygen oxygen reduction Oxygen reduction reactions Polyhedra Pyrolysis Ranking Regenerative fuel cells Roasting Splitting water oxidation Water splitting heterogeneous catalysts water oxidation metal nanoparticles oxygen reduction nanostructured materials
ISSN:	1433-7851, 1521-3773, 1521-3773
On-line přístup:	Získat plný text
Tagy:	Přidat tag Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!

Popis
Shrnutí:	Efficient reversible oxygen electrodes for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are vitally important for various energy conversion devices, such as regenerative fuel cells and metal–air batteries. However, realization of such electrodes is impeded by insufficient activity and instability of electrocatalysts for both water splitting and oxygen reduction. We report highly active bifunctional electrocatalysts for oxygen electrodes comprising core–shell Co@Co3O4 nanoparticles embedded in CNT‐grafted N‐doped carbon‐polyhedra obtained by the pyrolysis of cobalt metal–organic framework (ZIF‐67) in a reductive H2 atmosphere and subsequent controlled oxidative calcination. The catalysts afford 0.85 V reversible overvoltage in 0.1 m KOH, surpassing Pt/C, IrO2, and RuO2 and thus ranking them among one of the best non‐precious‐metal electrocatalysts for reversible oxygen electrodes. An electrocatalyst consisting of Co@Co3O4 embedded in carbon nanotube‐grafted N‐doped carbon polyhedra formed in situ has been fabricated from metal–organic frameworks. The electrocatalyst shows high activity towards water oxidation and oxygen reduction and outperforms Pt‐, Ir‐, and Ru‐based electrocatalysts.
Bibliografie:	ArticleID:ANIE201509382 DFG Deutsche Forschungsgemeinschaft ark:/67375/WNG-WD9LNMQ7-D istex:9BF920CCAE5318035E0D90089F7FE3BC3854D5A7 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	1433-7851 1521-3773 1521-3773
DOI:	10.1002/anie.201509382