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Electrochemical Properties of Yolk–Shell‐Structured Zn–Fe–S Multicomponent Sulfide Materials with a 1:2 Zn/Fe Molar Ratio
Author(s) -
Won Jong Min,
Lee JongHeun,
Kang Yun Chan
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201405512
Subject(s) - sulfidation , sphalerite , electrochemistry , sulfide , molar ratio , materials science , hexagonal prism , shell (structure) , molar , metallurgy , chemical engineering , analytical chemistry (journal) , chemistry , inorganic chemistry , hexagonal crystal system , electrode , crystallography , catalysis , sulfur , composite material , quartz , medicine , dentistry , engineering , biochemistry , chromatography
Yolk–shell‐structured Zn–Fe–S multicomponent sulfide materials with a 1:2 Zn/Fe molar ratio were prepared applying a sulfidation process to ZnFe 2 O 4 yolk–shell powders. The Zn–Fe–S powders had mixed sphalerite (Zn,Fe)S and hexagonal FeS crystal structures. The discharge capacities of the Zn–Fe–S powders sulfidated at 350 °C at a constant current density of 500 mA g −1 for the first, second, and fiftieth cycles were 1098, 912, and 913 mA h g −1 , respectively. The powders exhibited a high discharge capacity of 602 mA h g −1 even at the high current density of 10 A g −1 . The synergistic effect of yolk–shell structure and multicomponent composition improved the electrochemical properties of Zn–Fe–S powders.