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Ambade, R.,Ambade, S.,Shrestha, N.,Salunkhe, R.,Lee, W.,Bagde, S.,Kim, J.,Stadler, F.,Yamauchi, Y.,Lee, S. H. Royal Society of Chemistry 2017 Journal of materials chemistry. A, Materials for e Vol.5 No.1
<P>One-dimensional (1D) nanostructured materials have attracted intense interest because they are superior for applications when compared to their bulk counterparts, owing to their unique and fascinating properties. We thus demonstrate the development of conducting 1D polythiophene (PTh) nanofibers in hollow TiO2 nanotube arrays (TNTs) by controlling nucleation and growth during the electropolymerization of the thiophene monomer. The progression of nanofiber (NF) formation in the hollow interiors of the TNTs follows a three-dimensional instantaneous nucleation and growth mode, in which the polymer grows at a rate that does not allow for the build-up of the polymer on new polymerization sites, but only on existing ones. The formation of highly conductive dienes of PTh is confirmed, with increased conjugation in PTh NFs grown in the confined matrix of TNTs. These 1D PTh-TNT NFs show potential as a promising supercapacitor electrode material, exhibiting a high specific capacitance of 1052 F g(-1), which clearly highlights their importance as potential next-generation charge storage entities.</P>
Kaneti, Yusuf Valentino,Salunkhe, Rahul R.,Wulan Septiani, Ni Luh,Young, Christine,Jiang, Xuchuan,He, Yan-Bing,Kang, Yong-Mook,Sugahara, Yoshiyuki,Yamauchi, Yusuke The Royal Society of Chemistry 2018 Journal of materials chemistry. A, Materials for e Vol.6 No.14
<P>In this work, we propose a general template-free strategy for fabricating two-dimensional mesoporous mixed oxide nanosheets, such as metal cobaltites (MCo2O4, M = Ni, Zn) through the self-deconstruction/reconstruction of highly uniform Co-based metal glycerate nanospheres into 2D Co-based metal glycerate/hydroxide nanosheets, induced by the so-called “water treatment” process at room temperature followed by their calcination in air at 260 °C. The proposed ‘self-deconstruction/reconstruction’ strategy is highly advantageous as the resulting 2D metal cobaltite nanosheets possess very high surface areas (150-200 m<SUP>2</SUP>g<SUP>−1</SUP>) and mesoporous features with narrow pore size distribution. In addition, our proposed method also enables the crystallization temperature to achieve pure metal cobaltite phase from the precursor phase to be lowered by 50 °C. Using the 2D mesoporous NiCo2O4nanosheets as a representative sample, we found that they exhibit 6-20 times higher specific capacitance and greatly enhanced capacitance retention compared to the NiCo2O4nanospheres achieved through the direct calcination of the Ni-Co glycerate nanospheres. This highlights another advantage of the proposed strategy for enhancing the electrochemical performance of the mixed oxide products for supercapacitor applications. Furthermore, the asymmetric supercapacitor (ASC) assembled using the 2D NiCo2O4nanosheets//graphene oxide (GO) exhibits a maximum energy density of 38.53 W h kg<SUP>−1</SUP>, while also showing a high capacitance retention of 91% after 2000 cycles at 5 A g<SUP>−1</SUP>. It is expected that the proposed general method may be extended to other transition metal elements for creating 2D mixed oxide nanosheets with enhanced surface areas and improved electrochemical performance.</P>
Ambade, Rohan B.,Ambade, Swapnil B.,Salunkhe, Rahul R.,Malgras, Victor,Jin, Sung-Ho,Yamauchi, Yusuke,Lee, Soo-Hyoung The Royal Society of Chemistry 2016 Journal of materials chemistry. A, Materials for e Vol.4 No.19
<P>The new generation of miniaturized energy storage devices offers high energy and power densities and is compatible with flexible, portable, or wearable textile electronics which are currently in great demand. Here, we demonstrate the successful development of flexible, wire shaped (f-WS) all-solid-state symmetric supercapacitors (SCs) based on a facile electropolymerization of polythiophene (e-PTh) on titania (Ti) wire. The f-WS all-solid-state symmetric SCs, exhibiting high electrochemical performance, are fabricated by slightly intertwining two similar e-PTh electrodes to form both the cathode and anode which are then individually coated with a thin layer of H2SO4-PVA gel, acting both as electrolyte and as separator. The optimized devices (∼1.5 cm long), based on e-PTh/Ti wire show a high capacitive performance (1357.31 mF g<SUP>−1</SUP>or 71.84 mF cm<SUP>−2</SUP>) and an extremely high energy density (23.11 μW h cm<SUP>−2</SUP>) at a power density of 90.44 μW cm<SUP>−2</SUP>using an operational potential window of 1.8 V, which is beneficial for applications requiring high energy and power. The robust f-WS all-solid-state symmetric SCs also exhibit excellent mechanical flexibility with minimal change in capacitance upon bending at 360°. Furthermore, the SCs were implemented in the textile of a wearable/portable electronic device using a conventional weaving method, thus demonstrating a high potential for next-generation wearable textile electronic applications.</P>