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Reconstruction of TiO2/MnO2-C nanotube/nanoflake core/shell arrays as high-performance supercapacitor electrodes

机译:TiO2 / MnO2-C纳米管/纳米瓶芯/壳阵列的重建为高性能超级电容电极

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摘要

Construction of electrodes with fast reaction kinetics is of great importance for achieving advanced supercapacitors. Herein we report a facile combined synthetic strategy with atomic layer deposition (ALD) and electrodeposition to rationally fabricate nanotube/nanoflake core/shell arrays. ALD-TiO2 nanotubes are used as the skeleton core for assembly of electrodeposited MnO2-C nanoflake shells forming a core/shell structure. Highly porous architecture and good electrical conductivity are combined in this unique core/shell structure, resulting in fast ion/electron transfer. In tests of electrochemical performance, the TiO2/MnO2-C core/shell arrays are characterized as cathode for asymmetric supecapacitors and exhibit high specific capacitance (880 F g(-1) at 2.5 A g(-1)), excellent rate properties (735 F g(-1) at 30 A g(-1)) and good long-term cycling stability (94.3% capacitance retention after 20 000 cycles). The proposed electrode construction strategy is favorable for fabrication of other advanced supercapacitor electrodes.
机译:具有快速反应动力学的电极构造对于实现先进的超级电容器具有重要意义。在此,我们报告了一种具有原子层沉积(ALD)和电沉积的容易组合的合成策略,以合理制造纳米管/纳米辊芯/壳阵列。 Ald-TiO2纳米管用作用于组装电沉积的MnO2-C纳米瓶壳的骨架芯,形成芯/壳结构。在这种独特的芯/壳结构中,高度多孔结构和良好的导电性在这种独特的芯/壳结构中结合,导致快速离子/电子转移。在电化学性能的测试中,TiO2 / MnO2-C芯/壳阵列的特征在于不对称浮出孔器的阴极,并且在2.5Ag(-1))下表现出高特定电容(880V(-1)),优异的速率性质( 735f g(-1)在30 a g(-1))和良好的长期循环稳定性(在20 000次循环后的电容保留94.3%)。所提出的电极结构策略有利于制造其他先进的超级电容电极。

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