Journal
CHEMICAL ENGINEERING JOURNAL
Volume 390, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124557
Keywords
Tunable hierarchical nanostructures; FexCo3-xSe4; Nanosheet arrays; Specific capacity; Energy density
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Funding
- Nano-Material Technology Development Program through the National Research Foundation - Ministry of Science and ICT of Republic of Korea [2016M3A7B4900117]
- Regional Leading Research Center Program through the National Research Foundation - Ministry of Science and ICT of Republic of Korea [2019R1A5A8080326]
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Hierarchical nanoarchitectures with large void space, unique porous networks, and numerous active sites for advanced supercapacitor (SC) electrodes has attracted great attention in modern electronics. Herein, a novel strategy is established to rational design of hierarchical iron cobalt selenide (FexCo3-xSe4) with tunable nanostructure and morphology by adjusting the stoichiometric ration of Fe: Co in order to enhance the energy density of SCs. The optimal FeCo2Se4 nanosheet arrays (NAs) enhances the electrical conductivity, electroactive sites, and intrinsic reactivity, achieving an ultra-high specific capacity of similar to 398.5 mA h g(-1) at a current density of 1 mA cm(-2) with an exceptional rate capability (similar to 304.2 mA h g(-1) at a current density of 50 mA cm(-2)), and ultra-long cycle life (similar to 98.2% retention after 10,000 cycles). Taking advantage of FeCo2Se4 NAs positive electrode, we have successfully assembled solid-state asymmetric SC (ASC) with Fe2O3@NG hydrogel as the negative electrode. Impressively, the solid-state ASC achieves high operating voltage window upto 1.6 V, and thus delivers ultrahigh energy density of similar to 84.1 Wh kg(-1) at a power density of 0.69 kW kg(-1), and exceptional cycling stability (5.5% of capacity decay after 10,000 cycles), which outperform the recently reported metal selenide-based ASCs. These consequences clearly designate FeCo2Se4 NAs as an advanced electrode for next-generation energy storage technologies.
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