Edge Sites with Unsaturated Coordination on Core-Shell Mn3 O4 Mnx Co3-x O4 Nanostructures for Electrocatalytic Water Oxidation

Edge Sites with Unsaturated Coordination on Core-Shell Mn3 O4 Mnx Co3-x O4 Nanostructures for Electrocatalytic Water Oxidation

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 29(2017), 36 vom: 12. Sept.
1. Verfasser: Hu, Congling (VerfasserIn)
Weitere Verfasser: Zhang, Lei, Zhao, Zhi-Jian, Luo, Jun, Shi, Jing, Huang, Zhiqi, Gong, Jinlong
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article cobalt-manganese spinel oxides edge sites oxygen evolution reaction unsaturated coordination water splitting
Beschreibung
Zusammenfassung:© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Transition-metal oxides are extensively investigated as efficient electrocatalysts for the oxygen evolution reaction (OER). However, large-scale applications remain challenging due to their moderate catalytic activity. Optimized regulation of surface states can lead to improvement of catalytic properties. Here, the design of MnCox Mn3-x O4 nanoparticles with abundant edge sites via a simple seed-mediated growth strategy is described. The unsaturated coordination generated on the edge sites of Cox Mn3-x O4 shells makes a positive contribution to the surface-structure tailoring. Density functional theory calculations indicate that the edge sites with unsaturated coordination exhibit intense affinity for OH- in the alkaline electrolyte, which greatly enhances the electrochemical OER performance of the catalysts. The resulting Mn@Cox Mn3-x O4 catalysts yield a current density of 10 mA cm-2 at an overpotential of 246 mV and a relatively low Tafel slope of 46 mV dec-1 . The successful synthesis of these metal oxides nanoparticles with edge sites may pave a new path for rationally fabricating efficient OER catalysts
Beschreibung:Date Completed 18.07.2018
Date Revised 30.09.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.201701820