Qian Siyu, Chen Xinlong, Jiang Shiyu, Sun Qiang, Chen Xuefeng, Lu Jinxin, Geng Yikai, Duan Musen, Li Xiaoyou, Liu Shengchun
Opt Express. 2022 Jul 18;30(15):27322-27332. doi: 10.1364/OE.462189.
Compared with ex situ measurement, the in situ measurement is more suitable for inspecting complex electrochemical reactions and improving the intelligent energy storage management. However, most of the in situ investigation instruments are bulky and expensive. Here we demonstrate a miniaturized, portable, and low-cost fiber-optic sensing system for in situ monitoring the capacitance and temperature. It can help evaluate the self-discharge rate in supercapacitors (SCs). The fiber-optic sensing system with two probes are implanted inside the SCs to monitor the capacitance and temperature, respectively. The dual fiber-optic probes can work independently and avoid cross-interference through structure design. The fiber-optic localized surface plasmon resonance (LSPR) probe near the electrode surface can detect the capacitance in real-time by monitoring ion aggregation on the opposite electrode. The fiber-optic surface plasmon resonance (SPR) probe encapsulated in the thermosensitive liquid can independently detect the temperature change. The measurement uncertainties of the two sensing probes are 5.6 mF and 0.08 ℃, respectively. The proposed tiny and flexible fiber-optic sensing system provides a promising method for in situ monitoring the critical parameters. It is also a powerful tool for investigating electrochemical reactions in various energy storage devices.
与非原位测量相比，原位测量更适合于检测复杂的电化学反应并改善智能储能管理。然而，大多数原位研究仪器体积庞大且价格昂贵。在此，我们展示了一种用于原位监测电容和温度的小型化、便携式且低成本的光纤传感系统。它有助于评估超级电容器（SCs）的自放电率。带有两个探头的光纤传感系统被植入SCs内部，分别用于监测电容和温度。双光纤探头可以独立工作，并通过结构设计避免相互干扰。靠近电极表面的光纤局域表面等离子体共振（LSPR）探头通过监测对电极上的离子聚集来实时检测电容。封装在热敏液体中的光纤表面等离子体共振（SPR）探头可以独立检测温度变化。两个传感探头的测量不确定度分别为5.6 mF和0.08℃。所提出的微小且灵活的光纤传感系统为原位监测关键参数提供了一种很有前景的方法。它也是研究各种储能装置中电化学反应的有力工具。
