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On an Easy Way To Prepare Metal–Nitrogen Doped Carbon with Exclusive Presence of MeN4-type Sites Active for the ORR

Kramm, Ulrike I. and Herrmann-Geppert, Iris and Behrends, Jan and Lips, Klaus and Fiechter, Sebastian and Bogdanoff, Peter (2016):
On an Easy Way To Prepare Metal–Nitrogen Doped Carbon with Exclusive Presence of MeN4-type Sites Active for the ORR.
In: Journal of the American Chemical Society, American Chemical Society, pp. 635-640, 138, (2), ISSN 0002-7863,
DOI: 10.1021/jacs.5b11015,
[Online-Edition: https://doi.org/10.1021/jacs.5b11015],
[Article]

Abstract

Today, most metal and nitrogen doped carbon catalysts for ORR reveal a heterogeneous composition. This can be reasoned by a nonoptimized precursor composition and various steps in the preparation process to get the required active material. The significant presence of inorganic metal species interferes with the assignment of descriptors related to the ORR activity and stability. In this work we present a simple and feasible way to reduce the contribution of inorganic metal species in some cases even down to zero. Such catalysts reveal the desired homogeneous composition of MeN4 (Me = metal) sites in the carbon that is accompanied by a significant enhancement in ORR activity. Among the work of other international groups, our iron-based catalyst comprises the highest density of FeN4 sites ever reported without interference of inorganic metal sites.

Item Type: Article
Erschienen: 2016
Creators: Kramm, Ulrike I. and Herrmann-Geppert, Iris and Behrends, Jan and Lips, Klaus and Fiechter, Sebastian and Bogdanoff, Peter
Title: On an Easy Way To Prepare Metal–Nitrogen Doped Carbon with Exclusive Presence of MeN4-type Sites Active for the ORR
Language: English
Abstract:

Today, most metal and nitrogen doped carbon catalysts for ORR reveal a heterogeneous composition. This can be reasoned by a nonoptimized precursor composition and various steps in the preparation process to get the required active material. The significant presence of inorganic metal species interferes with the assignment of descriptors related to the ORR activity and stability. In this work we present a simple and feasible way to reduce the contribution of inorganic metal species in some cases even down to zero. Such catalysts reveal the desired homogeneous composition of MeN4 (Me = metal) sites in the carbon that is accompanied by a significant enhancement in ORR activity. Among the work of other international groups, our iron-based catalyst comprises the highest density of FeN4 sites ever reported without interference of inorganic metal sites.

Journal or Publication Title: Journal of the American Chemical Society
Volume: 138
Number: 2
Publisher: American Chemical Society
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Catalysts and Electrocatalysts
Date Deposited: 02 Jan 2018 13:43
DOI: 10.1021/jacs.5b11015
Official URL: https://doi.org/10.1021/jacs.5b11015
Funders: Financial support by the DFG funding of the Excellence Initiative, Darmstadt Graduate School of Excellence Energy Science and Engineering (GSC 1070), is gratefully acknowledged by U.I.K.
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