Reconfiguring solvation network and interfacial engineering of Zn metal anode with biomass carbon quantum dot

The implementation of aqueous zinc-ion batteries (AZIBs) in energy storage systems has uneven Zn dendrites and side reactions seriously at the zinc anode and electrolyte interface. A novel green biomass carbon quantum dot (BCDs) additive influenced the hydrogen bonding network of the electrolyte, reduced water activity, and suppressed hydrogen evolution corrosion of the zinc anode. At the same time, we proposed a buffer redistribution effect that BCDs can act as the support of SO₄^2-, and the linkage mechanism can further prolong the residence time of Zn²⁺ on SO₄^2--BCDs. This effectively allows more time for the adsorbed Zn²⁺ to migrate to the most stable position on Zn (0 0 2) and form a perfect pattern, it regulated the Zn²⁺ solvation network and interfacial chemistry of zinc anodes. In addition, the Zn||Zn-symmetric battery with a current density of 1 mA cm^-2/1 mAh cm^-2 can cycling 3450 h. And the constructed full Zn||PANI full battery can be stably cycled 5000 cycles at a current density of 0.5 and 5 A g^-1. This study reveals the principle of maximizing zinc utilization solvate structural interface design, and highlights the commercial potential of BCDs additives in the design for efficient and durable AZIBs.