Organic flow battery built from green tea polyphenols demonstrates safe energy storage for education

A hacker has built a flow battery using compounds from green tea, demonstrating a safer alternative for educational settings. The battery uses epigallocatechin gallate (EGCG) from matcha powder as the electrolyte, with carbon electrodes and a terracotta flower pot as the barrier. The design is based on a 2016 German research paper and produces under one volt and a few milliamps, enough to power a small fan or LEDs. The project shows that organic flow batteries can work with widely available, non-toxic materials. While the performance is far too low for grid storage, the approach could make flow battery demonstrations accessible in classrooms. The use of matcha powder and common materials like graphite foil and activated carbon keeps costs low and safety high. This is a proof of concept, not a commercial product. The voltage and current are minimal, and scaling would require different chemistry. But for teaching electrochemistry and flow battery principles without hazardous chemicals, this is a practical and clever build.