Boruah Buddha Deka, Mathieson Angus, Wen Bo, Jo Changshin, Deschler Felix, De Volder Michael
Institute for Manufacturing, Department of Engineering, University of Cambridge, Cambridge CB3 0FS, United Kingdom.
Institute for Manufacturing, Department of Engineering, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0FS, United Kingdom.
Nano Lett. 2020 Aug 12;20(8):5967-5974. doi: 10.1021/acs.nanolett.0c01958. Epub 2020 Jul 14.
Off-grid energy storage devices are becoming increasingly important to power distributed applications, such as the Internet of things, and smart city ubiquitous sensor systems. To date, this has been achieved by combining an energy storage device, e.g., a battery or capacitor with an energy harvester, e.g., a solar cell. However, this approach inherently increases the device footprint and the output voltages of energy harvesters often do not match those required by energy storage device. Here we propose the first photo-rechargeable zinc-ion capacitors, where graphitic carbon nitride acts simultaneously as the capacitor electrode and light harvesting material. This approach allows light to be used to recharge the capacitor directly and they can be operated in a continuous light powered mode. These capacitors show a photo-rechargeable specific capacitance of ∼11377 mF g, a photo-charging voltage response of ∼850 mV, and a cyclability with ∼90% capacitance retention over 1000 cycles.
离网储能设备对于为诸如物联网和智慧城市无处不在的传感器系统等分布式应用供电正变得越来越重要。迄今为止，这是通过将储能设备（例如电池或电容器）与能量收集器（例如太阳能电池）相结合来实现的。然而，这种方法本质上会增加设备占地面积，并且能量收集器的输出电压通常与储能设备所需的电压不匹配。在此，我们提出了首个光可充电锌离子电容器，其中石墨相氮化碳同时充当电容器电极和光收集材料。这种方法允许光直接用于对电容器充电，并且它们可以在连续光供电模式下运行。这些电容器显示出约11377 mF g的光可充电比电容、约850 mV的光充电电压响应以及在1000次循环中约90%的电容保持率的循环稳定性。
