Flexible and biodegradable electronics have emerged as a promising solution for escalating electronic waste issue caused by the rapid development of skin patch electronics. Fully biodegradable displays are essential for visualizing biological/physical/chemical/electrochemical signals measured by a wide range of skin patch electronics. Here we propose fully biodegradable electrochromic display providing low operating voltage and low power consumption. The biodegradable transparent conductive electrode was fabricated by transferring free-standing tungsten nanomesh onto poly lactic-co-glycolic acid substrate using electrospinning templating, minimizing damage to the substrate. Electrochromic layer was tungsten oxide which is biodegradable, and a ferrocyanide/ferricyanide redox agent was utilized as a counter electrode reaction to enhance operational stability in an aqueous electrolyte by reducing operating voltage and side reactions. This display successfully visualized diverse signals from various biodegradable electronics such as UV sensors and electrochemical transistors, and finally underwent eco-friendly degradation in phosphate-buffered saline or soil under mild conditions.

柔性和可生物降解的电子产品已成为一种很有前途的解决方案，可以解决因皮肤贴片电子产品的快速发展而导致的电子垃圾问题升级。完全可生物降解的显示器对于可视化由各种皮肤贴片电子设备测量的生物/物理/化学/电化学信号至关重要。在这里，我们提出了完全可生物降解的电致变色显示器，提供低工作电压和低功耗。通过使用静电纺丝模板将独立的钨纳米网转移到聚乳酸-羟基乙酸共聚物酸基板上，从而最大限度地减少对基板的损坏，从而制造出可生物降解的透明导电电极。电致变色层是可生物降解的氧化钨，亚铁氰化物/铁氰化物氧化还原剂用作对电极反应，通过降低操作电压和副反应来提高水性电解质中的操作稳定性。该显示器成功地可视化了来自各种可生物降解电子设备（如紫外线传感器和电化学晶体管）的各种信号，并最终在温和的条件下在磷酸盐缓冲盐水或土壤中进行了环保降解。