A new, rapid, and practical procedure to obtain quantitative kinetic information of electrochromic materials is proposed. When the transition between two colors on a colored electrode surface is monitorized by digital video, the analysis of pixel color intensity (I) in sequential RGB digital images allows us to precise the half-life time (t_1/2) of the color change since a maximum value of the standard deviation of the pixel intensity (σ(I)) is reached. We simulated and analyzed the evolution of standard deviation during an electrochromic transition in different circumstances (kinetic and diffusion control). As an example of application, electrochromic transitions of a thin film model, the Prussian blue (PB), were digitally recorded during potential step chronoamperometry. From obtained t_1/2, we calculated kinetic constants of the first order blue-to-transparent transition at different potential steps. The results suggest the great potential of this novel methodology to quantify the kinetics of electrochromic changes, even, in proof-of-concepts devices.

提出了一种新的，快速，实用的方法来获得电致变色材料的定量动力学信息。当通过数字视频监控彩色电极表面上两种颜色之间的过渡时，对连续RGB数字图像中像素颜色强度（I）的分析使我们能够精确地确定颜色变化的半衰期（t _1/2）因为像素强度的标准偏差的最大值（σ（I）） 到达了。我们模拟并分析了在不同情况（运动和扩散控制）下电致变色过渡过程中标准偏差的演变。作为应用示例，在电位阶跃计时电流分析法中以数字方式记录了薄膜模型的普鲁士蓝（PB）的电致变色转变。从获得的t _1/2，我们计算出在不同的电位阶跃下一阶蓝色到透明转变的动力学常数。结果表明，即使在概念验证设备中，这种新颖方法也具有量化电致变色动力学的巨大潜力。