Opt Lett. 2023 Feb 15;48(4):872-875. doi: 10.1364/OL.480972.
Recycling Pb from lead acid batteries is rather important in environmental protection, but current strategies need a high temperature or produce secondary pollution. Herein, we present a green reactant recycling method to synthesize PbI micro-crystals by extracting the Pb from waste lead acid batteries. Systematical characterizations indicate that the as-prepared PbI micro-crystals show high purity, high crystal quality with a 2H-hexagonal crystal structure, and excellent optical properties with a bandgap of 2.3 eV. Based on the recycled 2H-PbI micro-crystals, a symmetrically structured ITO/PbI/ITO photodetector is fabricated. Under 10 V bias voltage, the device reveals a distinct photo-response to UV-visible light and superior performance, with a dark current of 1.06 nA, an on-off ratio of 103, a responsivity of 15.5 mA/W, and a detectivity of 4.7 × 10 Hz W. In addition, the photodetector also exhibits relatively rapid response speeds of 69 ms (rise time) and 64 ms (decay time). Our study provides an innovative and green strategy for producing a UV-visible photodetector based on recycled lead acid batteries, which is significant in environmental protection and the recycling economy.
从废旧铅酸电池中回收铅对于环境保护非常重要，但目前的策略需要高温或产生二次污染。在此，我们提出了一种绿色反应物回收方法，通过从废铅酸电池中提取铅来合成 PbI 微晶体。系统的特性表明，所制备的 PbI 微晶体具有高纯度、高质量的 2H-六方晶体结构和优异的光学性能，带隙为 2.3 eV。基于回收的 2H-PbI 微晶体，制造了对称结构的 ITO/PbI/ITO 光电探测器。在 10 V 偏置电压下，该器件对紫外可见光表现出明显的光电响应和优异的性能，暗电流为 1.06 nA，开关比为 103，响应度为 15.5 mA/W，探测率为 4.7×10 Hz W。此外，该光电探测器还表现出相对较快的响应速度，上升时间为 69 ms，下降时间为 64 ms。我们的研究为基于回收铅酸电池的紫外可见光光电探测器的生产提供了一种创新的绿色策略，在环境保护和循环经济方面具有重要意义。
