TY - JOUR
T1 - Synthesis of hierarchical structured Fe2O3 rod clusters with numerous empty nanovoids
T2 - Via the Kirkendall effect and their electrochemical properties for lithium-ion storage
AU - Park, Seung Keun
AU - Choi, Jae Hun
AU - Kang, Yun Chan
N1 - Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (No. 2017R1A2B2008592). This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2017R1A4A1014806). This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), and granted nancial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (20153030091450).
Publisher Copyright:
© 2018 The Royal Society of Chemistry.
PY - 2018
Y1 - 2018
N2 - The Kirkendall effect has been widely applied to prepare hollow/porous metal-oxide-based composites. We propose a new mechanism for the transformation of hierarchical structured metal selenides into their corresponding metal oxides with unique structures via the Kirkendall effect. Based on this mechanism, hierarchical structured iron oxide clusters comprising one-dimensional nanorods with numerous empty nanovoids were successfully prepared. FeSe2 rod clusters synthesized by a one-pot hydrothermal process were post-treated under an air atmosphere. During the oxidation process, FeSe2@FeOx-Se@Fe2O3 and FeOx-Se@Fe2O3 intermediates are formed owing to the different diffusion rates of iron cations, the selenium component, and oxygen gas. As the oxidation proceeded, elimination by evaporation of the SeO2 layer formed by the reaction of the diffused-out metalloid Se and oxygen gas and oxidation of FeOx resulted in porous Fe2O3 nanorods with numerous interconnected empty nanovoids. When employed as a lithium-ion battery anode, hierarchical Fe2O3 rod clusters exhibited high reversible discharge capacity, good cycling stability, and excellent rate performance. Following 200 cycles, their discharge capacity is 1318 mA h g-1 at a current density of 1 A g-1. Additionally, the rod clusters delivered a discharge capacity of 745 mA h g-1 at a high current density of 10 A g-1.
AB - The Kirkendall effect has been widely applied to prepare hollow/porous metal-oxide-based composites. We propose a new mechanism for the transformation of hierarchical structured metal selenides into their corresponding metal oxides with unique structures via the Kirkendall effect. Based on this mechanism, hierarchical structured iron oxide clusters comprising one-dimensional nanorods with numerous empty nanovoids were successfully prepared. FeSe2 rod clusters synthesized by a one-pot hydrothermal process were post-treated under an air atmosphere. During the oxidation process, FeSe2@FeOx-Se@Fe2O3 and FeOx-Se@Fe2O3 intermediates are formed owing to the different diffusion rates of iron cations, the selenium component, and oxygen gas. As the oxidation proceeded, elimination by evaporation of the SeO2 layer formed by the reaction of the diffused-out metalloid Se and oxygen gas and oxidation of FeOx resulted in porous Fe2O3 nanorods with numerous interconnected empty nanovoids. When employed as a lithium-ion battery anode, hierarchical Fe2O3 rod clusters exhibited high reversible discharge capacity, good cycling stability, and excellent rate performance. Following 200 cycles, their discharge capacity is 1318 mA h g-1 at a current density of 1 A g-1. Additionally, the rod clusters delivered a discharge capacity of 745 mA h g-1 at a high current density of 10 A g-1.
UR - http://www.scopus.com/inward/record.url?scp=85046826902&partnerID=8YFLogxK
U2 - 10.1039/c8ta02342e
DO - 10.1039/c8ta02342e
M3 - Article
AN - SCOPUS:85046826902
SN - 2050-7488
VL - 6
SP - 8462
EP - 8469
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 18
ER -