A H2O2 Self‐Charging Zinc Battery with Ultrafast Power Generation and Storage

Abstract Self‐charging power systems are considered as promising alternatives for off‐grid energy devices to provide sustained electricity supply. However, the conventional self‐charging systems are severely restricted by the energy availability and time‐consuming charging process as well as insufficient capacity. Herein, we developed an ultrafast H 2 O 2 self‐charging aqueous Zn/NaFeFe(CN) 6 battery, which simultaneously integrates the H 2 O 2 power generation and energy storage into a battery configuration. In such battery, the chemical energy conversion of H 2 O 2 can generate electrical energy to self‐charge the battery to 1.7 V through the redox reaction between H 2 O 2 and NaFeFe(CN) 6 cathode. The thermodynamically and kinetically favorable redox reaction contributes to the ultrafast H 2 O 2 self‐charging rate and the extremely short self‐charging time within 60 seconds. Moreover, the rapid H 2 O 2 power generation can promptly compensate the energy consumption of battery to provide continuous electricity supply. Impressively, this self‐charging battery shows excellent scalability of device architecture and can be designed to a H 2 O 2 single‐flow battery of 7.06 Ah to extend the long‐term energy supply. This work not only provides a route to design self‐charging batteries with fast charging rate and high capacity, but also pushes forward the development of self‐charging power systems for advanced large‐scale energy storage applications.