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Investigation on the Catalytic Performance of Reduced‐Graphene‐Oxide‐Interpolated FeS 2 and FeS for Oxygen Reduction Reaction
Author(s) -
Fang Hengyi,
Huang Taizhong,
Mao Jianfeng,
Yao Shuo,
Dinesh M. Mayilvel,
Sun Yue,
Liang Dong,
Qi Lei,
Yu Jiemei,
Jiang Zhankun
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800835
Subject(s) - tafel equation , graphene , catalysis , oxide , cyclic voltammetry , electrocatalyst , electrolyte , materials science , chemistry , inorganic chemistry , chemical engineering , electrochemistry , nanotechnology , electrode , metallurgy , organic chemistry , engineering
The oxygen reduction reaction (ORR) plays a key role in many kinds of energy conversion and energy storage devices, especially in fuel cells. Developing low‐cost, easily prepared, and high‐efficiency catalysts is a crucial factor for the large‐scale applications of fuel cells. Herein, we report the reduced graphene oxide (rGO) interpolated FeS 2 and FeS as low cost and high performance electrocatalyst for ORR in the alkaline electrolyte. Cyclic voltammetry tests indicate that the onset potential of the ORR for FeS 2 @rGO is −0.142 V, which is close to the state‐of‐the‐art commercial Pt/C (‐0.114 V) catalyst. A low Tafel slope of ∼ 98 mV/decade and high durability are also observed for the FeS 2 @rGO composite for ORR. The reaction kinetics study shows that the rGO‐interpolated FeS 2 catalyzed ORR major happen through 4‐electron pathway, but the rGO‐interpolated FeS catalyzed ORR major happen through mixed 2‐electron and 4‐electron pathway. The S−S bond of FeS 2 play the major role for the happening of ORR through 4‐electron pathway.