TY - JOUR
T1 - Metal-organic framework-derived CoSe2/(NiCo)Se2 box-in-box hollow nanocubes with enhanced electrochemical properties for sodium-ion storage and hydrogen evolution
AU - Park, Seung Keun
AU - Kim, Jin Koo
AU - Chan Kang, Yun
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2017R1A2B2008592). This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the granted nancial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20153030091450).
PY - 2017
Y1 - 2017
N2 - Multishell structured metal selenide nanocubes, namely, Co/(NiCo)Se2 box-in-box structures with different shell compositions, were successfully synthesized by applying zeolitic imidazolate framework-67 (ZIF-67) as a template. This strategy involved the fabrication of cube-shaped ZIF-67/Ni-Co layered double hydroxides with a yolk-shell structure and then transformation into Co/(NiCo)Se2 with a box-in-box structure by a selenization process under Ar/H2 conditions. During the selenization step, hollow structured CoSe2 cores were generated by Ostwald ripening, resulting in the formation of Co/(NiCo)Se2 with a box-in-box structure composed of an inner CoSe2 shell and an outer (NiCo)Se2 shell. Due to the synergetic effect of the unique structure and multicomponent selenide composition, the Co/(NiCo)Se2 with the box-in-box structure offered excellent dual functionality as both an anode for sodium ion batteries (SIBs) and an electrocatalyst for the hydrogen evolution reaction (HER). Electrochemical tests on the Co/(NiCo)Se2 with the box-in-box structure demonstrated a low Tafel slope (39.8 mV dec-1) and excellent stability. In addition, it delivered a high specific capacity of 497 mA h g-1 after 80 cycles, with a current density of 0.2 A g-1 and excellent cycling stability as an anode material for SIBs.
AB - Multishell structured metal selenide nanocubes, namely, Co/(NiCo)Se2 box-in-box structures with different shell compositions, were successfully synthesized by applying zeolitic imidazolate framework-67 (ZIF-67) as a template. This strategy involved the fabrication of cube-shaped ZIF-67/Ni-Co layered double hydroxides with a yolk-shell structure and then transformation into Co/(NiCo)Se2 with a box-in-box structure by a selenization process under Ar/H2 conditions. During the selenization step, hollow structured CoSe2 cores were generated by Ostwald ripening, resulting in the formation of Co/(NiCo)Se2 with a box-in-box structure composed of an inner CoSe2 shell and an outer (NiCo)Se2 shell. Due to the synergetic effect of the unique structure and multicomponent selenide composition, the Co/(NiCo)Se2 with the box-in-box structure offered excellent dual functionality as both an anode for sodium ion batteries (SIBs) and an electrocatalyst for the hydrogen evolution reaction (HER). Electrochemical tests on the Co/(NiCo)Se2 with the box-in-box structure demonstrated a low Tafel slope (39.8 mV dec-1) and excellent stability. In addition, it delivered a high specific capacity of 497 mA h g-1 after 80 cycles, with a current density of 0.2 A g-1 and excellent cycling stability as an anode material for SIBs.
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U2 - 10.1039/c7ta05571d
DO - 10.1039/c7ta05571d
M3 - Article
AN - SCOPUS:85029479084
VL - 5
SP - 18823
EP - 18830
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 35
ER -