Abstract
The ordered ultrathin films based on the fabrication of Mg/Fe-LDHs ([Mg6Fe2(OH)16CO3·(H2O)4.5]0.375) nanosheets and hexacyanoferrate(III) anions via the self-assembly procedure were prepared. The electrodes modified by the films demonstrated a couple of well-defined reversible redox peaks attributed to [Fe(CN)6]3−/4− and Fe2+/3+ couples. The effects of cycle number, scan rate and Mg/Fe molar ratio on the CV performance of the thin-film electrodes were observed in K3[Fe(CN)6] electrolyte. The [Fe(CN)6]3− pillared Mg/Fe-LDHs with Mg/Fe molar ratio of 3 (LDH-(CN)-3) demonstrated an excellent electrochemical behavior with a potential window between − 0.2 and 1.0 V, high specific capacitance and sensitivity, indicating that the high crystallinity, large specific surface area and plentiful [Fe(CN)6]3− anions in interlayer spaces were necessary. Especially, the interlayer [Fe(CN)6]3− anions significantly affected the electrochemical behavior of the electrode, where the electrode reaction was controlled by the diffusion of [Fe(CN)6]3−/4− and Fe2+/3+ couples. Under current density of 2.5 A g−1, the optimized LDH-(CN)-3 electrode exhibited high specific capacitance of 250.81 F g−1 with good cycling stability. This facile synthesis strategy and the good electrochemical properties indicated that the LDH-(CN)-3 was a potential economical alternative material for supercapacitor application.
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This work is supported by the Joint Research Program of Hunan Provincial Natural Science Foundation (Xiangtan) of China (2016JJ5030), Hunan 2011 Collaborative Innovation Center of Chemical Engineering & Technology with Environmental Benignity and Effective Resource Utilization and General project of Hunan Provincial Education Department (17C1526).
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Ding, PX., Zeng, HY., Xu, S. et al. Electrochemical behaviors of iron-based layered double hydroxide thin-films. J Mater Sci: Mater Electron 29, 2748–2757 (2018). https://doi.org/10.1007/s10854-017-8202-x
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DOI: https://doi.org/10.1007/s10854-017-8202-x