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Electrochemical Properties of Hollow‐Structured MnS–Carbon Nanocomposite Powders Prepared by a One‐Pot Spray Pyrolysis Process
Author(s) -
Lee Su Min,
Lee JungKul,
Kang Yun Chan
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201301261
Subject(s) - composite number , materials science , thiourea , sulfidation , chemical engineering , carbon fibers , nanocomposite , pyrolysis , carbonization , manganese , sulfur , composite material , metallurgy , chemistry , organic chemistry , scanning electron microscope , engineering
Spherical, hollow MnSC composite powders were prepared from a solution of manganese salt, thiourea, and sucrose by one‐pot spray pyrolysis . The MnSC composite powders were generated by direct sulfidation of MnO with hydrogen sulfide gas generated in situ by decomposition of thiourea during spray pyrolysis . Sucrose, which is used as a carbon source material, plays a key role in the formation of the MnSC composite powders by improving the reducing atmosphere around the powders. Dot‐mapping images of the composite powders demonstrated uniform distribution of the manganese, sulfur, and carbon components within the MnSC composite powder. Fine crystals of MnS were uniformly mixed with carbon derived from polymerization and carbonization of sucrose. The carbon content of the MnSC composite powders was 26 wt %. The discharge capacities of the MnSC composite powders in the 2nd and 200th cycles were 863 and 967 mA h g −1 , respectively, at a current density of 1000 mA g −1 . The spherical and hollow morphology of the MnSC composite powders was completely retained, even after 200 cycles. The enhanced cycling and rate performance of the MnSC composite powders is ascribed to the structural stability of the composite powders.