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Highly Efficient Oxygen Reduction Reaction Activity of Graphitic Tube Encapsulating Nitrided Co x Fe y Alloy
Author(s) -
Sultan Siraj,
Tiwari Jitendra N.,
Jang JueHyuk,
Harzandi Ahmad M.,
Salehnia Foad,
Yoo Sung Jong,
Kim Kwang S.
Publication year - 2018
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201801002
Subject(s) - catalysis , materials science , proton exchange membrane fuel cell , metal , alloy , chemical engineering , oxygen , adsorption , methanol , inorganic chemistry , chemistry , metallurgy , biochemistry , organic chemistry , engineering
Nonprecious metals are promising catalysts to avoid the sluggish oxygen reduction reaction (ORR) in next‐generation regenerative fuel cells or metal–air batteries. Therefore, development of nonprecious metal catalysts for ORR is highly desirable. Herein, precise tuning of the atomic ratio of Fe and Co encapsulated in melamine‐derived nitrogen‐rich graphitic tube (NGT) is reported. The Co 1.08 Fe 3.34 hybrid with metalnitrogen bonds ( 1 : Co 1.08 Fe 3.34 @NGT) shows remarkable ORR catalytic activities (80 mV higher in onset potential and 50 mV higher in half‐wave potential than those of state‐of‐the‐art commercial Pt/C catalysts), high current density, and stability. In acidic solution, 1 also shows compatible performance to commercial Pt/C in terms of ORR activity, current density, stability, and methanol tolerance. The high ORR activity is ascribed to the co‐existence of FeN, CoN, and sufficient metallic FeCo alloys which favor faster electron movement and better adsorption of oxygen molecules on the catalyst surface. In the alkaline anion exchange membrane fuel cell setup, this cell delivers the power density of 117 mW cm −2 , demonstrating its potential use for energy conversion and storage applications.