论文标题
长期稳定的基于氧化物的超级电容器的无定形MO-TA氧化物纳米管
Amorphous Mo-Ta oxide nanotubes for long-term stable Mo oxide based supercapacitors
论文作者
论文摘要
随着便携式电器的大规模使用，对日益高的密度储能设备的需求很高。原则上，MOO3由于可以从其可逆的氧化还原反应中获得的高电荷密度而具有巨大的电势作为超电容设备中的负电极材料。然而，水溶液中MOO3的极差电化学稳定性阻止了在高电容设备中的实际用途。在这项工作中，我们描述了如何通过形成无氧化钼/氧化钼纳米管来克服这一严重的稳定性问题。存在临界量的TA-氧化物（> 20 at-％）的存在可阻止MOO3相的电化学衰减，从而产生极高的稳定性。由于氧化棘突提供的保护，在10000个充电/放电周期之后，无电容损失是可测量的。
With a large-scale usage of portable electric appliances, a high demand for increasingly high density energy storage devices has emerged. MoO3 has, in principle, a large potential as negative electrode material in supercapacitive devices, due to high charge densities that can be obtained from its reversible redox reactions. Nevertheless, the extremely poor electrochemical stability of MoO3 in aqueous electrolytes prevents a practical use in high capacitance devices. In this work, we describe how to overcome this severe stability issue by forming amorphous molybdenum oxide/tantalum oxide nanotubes by anodic oxidation of a Mo-Ta alloy. The presence of a critical amount of Ta-oxide (> 20 at-%) prevents the electrochemical decay of the MoO3 phase and thus yields an extremely high stability. Due to the protection provided by tantalum oxide, no capacitance losses are measureable after 10000 charg-ing/discharging cycles.
