Facile synthesis of Bi 2 Se 3 /nitrogen-doped carbon dot nanoplates for aqueous zinc ion battery cathodes.

BiSe is a promising cathode material for aqueous zinc ion batteries (AZIBs), but its limited capacity and poor cycling stability deter its further use in the development of AZIBs. To solve this issue, BiSe/NCD composites have been synthesized a simple two-step solvothermal method. The introduction of nitrogen-doped carbon dots (NCDs) provides more active sites and makes the composite surface rich in functional groups, which facilitates contact with aqueous electrolytes. The results showed that BiSe/NCDs improved the zinc storage properties of BiSe as a cathode material. The discharge specific capacity is 318 mA h g at 0.1 A g. The cycling performance of BiSe/NCDs was also relatively excellent compared to that of BiSe. This work offers a productive and feasible strategy for metal chalcogenides (MCs) as cathode materials for AZIBs to improve the zinc storage capacity.