Charge‐Balance Design in Complementary Electrochromic Devices Enabled by a Diffusion‐Controlled Electrochromic Anode

ABSTRACT Electrochromic devices offer a compelling platform for dynamic control of light and heat, with significant potential for energy‐efficient smart windows and adaptive optoelectronic applications. However, their widespread adoption is critically hindered by the lack of competent anodic materials capable of mitigating charge imbalance between the cathodic and anodic layers. Here, we demonstrate a full charge‐balanced electrochromic design based on a WO 3 /LiCoO 2 architecture, enabling high