3D printing structure -based Cu&Bi2O3 anode toward high-performance rechargeable alkaline battery and photodetector

As an energy storage device, the aqueous alkaline battery holds great potential, particularly for applications requiring high energy density and high power density. Anode materials with excellent performance are indispensable to producing stable and high-energy aqueous rechargeable batteries. In this study, 3D-printed porous and planar substrates were employed as growth vehicles for Bi2O3. As a result, rapid charge transfer and ion diffusion are successfully achieved by utilizing porous structure channels. A remarkable specific capacity of 2.63 mAh cm−2 is attained for the porous structure-based Bi2O3, which can attribute to the formed p-type homojunction between CuO/Cu2O and Bi2O3. Additionally, the cycle stability of Bi2O3 deposited on the porous structure substrate is enhanced dramatically due to this structure enables less bismuth-based salt ions, oxide, and hydroxide deposition. Consequently, the harmful accumulation of bismuth-based mixture deposition on the anode surface was prevented, resulting in the mitigation of electrode passivation. Besides, a favorable photoresponse rate is displayed for the porous structure Bi2O3 anode, proving the practicable Cu&Bi2O3 combination and the reasonable structural design.