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Comparative investigation of nitrogen species in transition metals incorporated carbon catalysts for the oxygen reduction reaction

Title
Comparative investigation of nitrogen species in transition metals incorporated carbon catalysts for the oxygen reduction reaction
Authors
JUNG, WONSUKKim, YoongonNoh, YuseongHan, HyunsuPark, SungminLee, JinwooKim, Won Bae
POSTECH Authors
Lee, JinwooKim, Won Bae
Date Issued
Sep-2018
Publisher
ELSEVIER SCIENCE BV
Abstract
The kinetic influences of transition metals (TMs) in non-platinum group metal (non-PGM) catalysts using ethylenediamine-TM (en-TM) complex are studied for the electro-reduction of oxygen. We exhibit that Ni atoms are inefficiently dispersed, which may influence the N doping as evidenced by XPS and elemental maps. High concentrations of N are attributed to the well-dispersed Co and Fe over the carbon. Electrochemical measurements demonstrate that the ORR on Co@NC and Fe@NC catalysts takes place faster than that on NC and Ni@NC catalysts. The correlation between the quaternary-N concentration of species and the onset potential with respect to TMs is investigated.
The kinetic influences of transition metals (TMs) in non-platinum group metal (non-PGM) catalysts using ethylenediamine-TM (en-TM) complex are studied for the electro-reduction of oxygen. We exhibit that Ni atoms are inefficiently dispersed, which may influence the N doping as evidenced by XPS and elemental maps. High concentrations of N are attributed to the well-dispersed Co and Fe over the carbon. Electrochemical measurements demonstrate that the ORR on Co@NC and Fe@NC catalysts takes place faster than that on NC and Ni@NC catalysts. The correlation between the quaternary-N concentration of species and the onset potential with respect to TMs is investigated.
Keywords
Carbon; Electrocatalysts; Electrolytic reduction; Iron compounds; Nickel compounds; Nitrogen; Oxygen; Carbon catalysts; Electro reduction; Electrochemical measurements; Ethylene diamine; Nitrogen species; Onset potential; Oxygen reduction reaction; Quaternary nitrogens; Transition metals
URI
http://oasis.postech.ac.kr/handle/2014.oak/94593
DOI
10.1016/j.cplett.2018.07.066
ISSN
0009-2614
Article Type
Article
Citation
CHEMICAL PHYSICS LETTERS, vol. 708, page. 42 - 47, 2018-09
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김원배KIM, WON BAE
Dept. of Chemical Enginrg
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