超级电容器
氮化钒
材料科学
电容
电解质
功率密度
电化学
储能
纳米技术
光电子学
氧化钌
氮化物
电极
功率(物理)
化学
图层(电子)
物理化学
物理
量子力学
作者
B. Asbani,Kévin Robert,Pascal Roussel,Thierry Brousse,Christophe Lethien
标识
DOI:10.1016/j.ensm.2021.02.006
摘要
Research on micro-supercapacitors remains one of the most important activities in the area of electrochemical energy storage for powering smart and miniaturized electronic devices. Here we design an asymmetric micro-supercapacitor (A-MSC) combining sputtered vanadium nitride film (VN) and electrodeposited hydrous ruthenium oxide (hRuO2) film. Taking advantage of their complementary electrochemical potential windows in 1 M KOH electrolyte, the A-MSC achieves a cell voltage up to 1.15 V, associated to high specific capacitance values for the device (≈ 100 mF cm−2). The energy density of this asymmetric VN / hRuO2 micro-supercapacitor reaches 20 µWh cm−2 at a power density of 3 mW cm−2. Taking benefit from the asymmetric configuration, a 5-fold enhancement factor in energy density is demonstrated for the VN / hRuO2 asymmetric micro-supercapacitor as compared to symmetric VN / VN and hRuO2 / hRuO2 microdevices.
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