Electrochemical energy storage devices that can harvest energy from the environment and store it are increasingly important to address energy poverty in developing parts of the world as well as powering off-grid autonomous devices. Currently, batteries or supercapacitors connected to solar cells are used for these applications, but these frequently suffer from voltage mismatches and inefficiencies in the device packaging. This paper presents an optically and electrochemically active electrode for photo-rechargeable zinc-ion capacitors using vanadium oxide nanofibers. These rely on photoexcited charge carrier separation to charge the capacitors without any external photovoltaic or electrical devices. We found that silver nanowires are better than carbon-based conductive additives as they support photoexcited hole transport and provide light scattering centers that enhance visible light absorption. The proposed capacitors show a ∼63% capacity increase under illumination, photorecharge in 30 min, and ∼99% capacity retention over 4000 cycles.

中文翻译：

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使用V ₂ O ₅活化碳电极的可光充电锌离子电容器

可以从环境中收集能量并将其存储的电化学能量存储设备，对于解决世界上发展中地区的能源贫困以及为离网自动设备供电提供越来越重要的意义。当前，连接到太阳能电池的电池或超级电容器用于这些应用，但是这些设备经常遭受电压不匹配和器件封装效率低下的困扰。本文提出了一种使用氧化钒纳米纤维的可光充电锌离子电容器的光学和电化学活性电极。这些依靠光激发的电荷载流子分离来为电容器充电，而无需任何外部光伏或电气设备。我们发现银纳米线比碳基导电添加剂更好，因为它们支持光激发的空穴传输，并提供增强可见光吸收的光散射中心。所建议的电容器在照明，30分钟的光充电下显示约63％的容量增加，并在4000次循环中显示约99％的容量保持率。