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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Elastic sandwich-type GaN/MnO2/MnON composites for flexible supercapacitors with high energy density
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Elastic sandwich-type GaN/MnO2/MnON composites for flexible supercapacitors with high energy density

机译：弹性夹层型GaN / MNO2 / MNON复合材料，适用于具有高能量密度的柔性超级电容器

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摘要

Metal oxides as supercapacitor (SC) electrode materials possess high capacitance and energy density, however, the low electrical conductivity and structural weakness resulting from volume shrinkage and expansion during the energy storage process seriously hinder their rate capabilities and cycling performances. Herein, we design and fabricate a metal nitride/metal oxide/metal oxynitride elastic sandwich structure nanohybrid with double stabilizing buffer layers for the first time. This unique hierarchical structure not only provides a highly conductive network and intimate contacts between carbon fiber (CFJ/GaN and MnO2/Mn oxynitride (MnON) for effective charge transportation, but also offers synergistic physical restriction and chemical confinement of volume change during charge/ discharge processes. Therefore, these conductive GaN/MnO2/MnON compact films used directly as an electrode possess a high areal capacitance of 1915.5 mF cm~(-2) (532.1 mA h cm~(-2)) at 0.1 mA cm~(-2). A flexible symmetric supercapacitor device based on the GaN/MnO2/MnON hybrid electrode exhibits outstanding energy output efficiency {achieved energy density of 0.76 mW h cm~(-3)), high capacity retention rate (95.5% capacity was retained after 10 000 cycles) and remarkable flexibility, showing its attractive prospect in wearable electronics and sustainable energy application. This design strategy provides an efficient way to apply large volume change metal oxide materials to energy storage and conversion devices.
机译：金属氧化物作为超级电容器（SC）电极材料具有高电容和能量密度，然而，由于体积收缩和储存过程中的膨胀导致的低电导率和结构弱度严重阻碍了它们的速率能力和循环性能。在此，我们首次设计和制造金属氮化物/金属氧化物/金属氮素结构纳米次组，其具有双稳定缓冲层。这种独特的层级结构不仅提供了高导电网络和碳纤维（CFJ / GaN和MnO2 / Mn氧氮化物（MNON）之间的紧密接触，而且有效充电运输，还提供协同的物理限制和在充电/放电期间的体积变化的化学限制方法。因此，直接用作电极的这些导电GaN / mnO2 / mnon紧凑型膜具有1915.5mF cm〜（-2）的高面积电容（532.1mA Hcm〜（-2）），在0.1 ma cm〜（ - 2）。一种基于GaN / MnO2 / mnon混合电极的柔性对称超电池装置表现出优异的能量输出效率{实现的能量密度为0.76 mW H cm〜（-3）），高容量保持率（95.5％之后保留了95.5％ 10 000个循环）和显着的灵活性，展示了可穿戴电子产品和可持续能源应用的吸引力前景。这种设计策略提供了一种有效的方法，将大体积变化金属氧化物材料应用于能量存储和转换装置。

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