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首页> 外文期刊>ACS applied materials & interfaces >Atomic Layer Deposition Alumina-Passivated Silicon Nanowires: Probing the Transition from Electrochemical Double-Layer Capacitor to Electrolytic Capacitor
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Atomic Layer Deposition Alumina-Passivated Silicon Nanowires: Probing the Transition from Electrochemical Double-Layer Capacitor to Electrolytic Capacitor

机译:原子层沉积氧化铝钝化的硅纳米线:探测从电化学双层电容器到电解电容的过渡

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摘要

Silicon nanowires were coated by a 1-5 nm thin alumina layer by atomic layer deposition (ALD) in order to replace poorly reproducible and unstable native silicon oxide by a highly conformal passivating alumina layer. The surface coating enabled probing the behavior of symmetric devices using such electrodes in the EMI-TFSI electrolyte, allowing us to attain a large cell voltage up to 6 V in ionic liquid, together with very high cyclability with less than 4% capacitance fade after 10(6) charge/discharge cycles. These results yielded fruitful insights into the transition between an electrochemical double-layer capacitor behavior and an electrolytic capacitor behavior. Ultimately, thin ALD dielectric coatings can be used to obtain hybrid devices exhibiting large cell voltage retaining energy and power densities close to the ones displayed by supercapacitors. and excellent cycle life of dielectric capacitors, while
机译:通过原子层沉积(ALD)通过1-5nM薄氧化铝层涂覆硅纳米线,以通过高度保密的钝化氧化铝层替换可差的可再现和不稳定的天然氧化硅。 表面涂层能够在EMI-TFSI电解质中使用这种电极探测对称装置的行为,使我们能够在离子液体中获得高达6V的大电池电压,以及10%的电容在10后的电容淡出的非常高的可阻碍性。 (6)充电/放电循环。 这些结果产生了富有成效的洞察电化学双层电容器行为与电解电容器行为之间的过渡。 最终,薄的ALD介电涂层可用于获得具有大电池电压保持能量和电力密度的混合装置,靠近超级电容器显示的电池电压。 和介电电容器的良好循环寿命,同时

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