Flow battery electrodes are vital for performing redox reactions, and an in-depth understanding of reaction kinetics and spatial distribution differences in electrodes is very important for improving the efficiency of electrochemical reactions. In this study, a reflection-type phase-sensitive weak measurement imaging system was developed for the detection of flow batteries. The phase difference between two polarization components in total internal reflection caused by electrode redox processes was measured by weak value amplification. The resulting refractive index resolution of the imaging system was estimated to be 2.8–4.2 × 10^–6 RIU. The real-time monitoring ability of the system was demonstrated by linear sweep voltammetry tests of vanadium redox batteries. Compared to traditional optical methods, the proposed weak measurement imaging sensor did not require coating, as it can be used in acid electrolytes of vanadium flow batteries. Meanwhile, the weak value amplification effect led to a higher resolution than the total internal reflection system shown in our previous work, thereby resulting in more accurate detection of electrochemical reactions. In sum, the proposed sensor looks very promising for the detection of electrochemical reactions in flow batteries, water splitting, electrochemical corrosion, and electrocatalysis.

中文翻译：

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用于通过弱值放大检测液流电池的成像传感器

液流电池电极对于进行氧化还原反应至关重要，深入了解电极的反应动力学和空间分布差异对于提高电化学反应效率非常重要。在这项研究中，开发了一种反射式相敏弱测量成像系统，用于检测液流电池。通过弱值放大测量电极氧化还原过程引起的全内反射中两个偏振分量之间的相位差。成像系统的最终折射率分辨率估计为 2.8–4.2 × 10 ^–6里乌。通过对钒氧化还原电池的线性扫描伏安法测试，证明了该系统的实时监测能力。与传统的光学方法相比，所提出的弱测量成像传感器不需要涂层，因为它可以用于钒液流电池的酸性电解质。同时，弱值放大效应导致比我们之前工作中显示的全内反射系统更高的分辨率，从而导致更准确的电化学反应检测。总之，所提出的传感器在检测液流电池中的电化学反应、水分解、电化学腐蚀和电催化方面看起来非常有前景。