Fig. 1: Current situation of MBs and fabrication of microelectrodes.
a Schematic illustration of the design of aqueous zinc-based micro-batteries based on the in situ conductivity enhancement-assisted double-cell reaction strategy. b The fabrication process of Zn||Bi2O3@Ag2O-based microelectrodes. This innovative approach challenges the conventional micro-battery configuration by sequentially coupling two battery reactions within a single microdevice, thereby optimizing the use of the previously inactive reaction chamber for enhanced areal capacity/energy density. More importantly, the Ag2O conversion reaction in the first step significantly improves the discharge capacity of the subsequent conversion reaction, achieving nearly an order-of-magnitude increase compared to single Zn||Bi2O3 MBs. As a result, the total capacity of the dual-reaction microdevice exceeds 2.1 times the combined discharge capacity of two individual MBs.
