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Lithium-ion batteries (LIBs) and potassium-ion batteries (KIBs) have broad application prospects in the fields of small/medium-sized electronic products and largescale energy storage. However, the fast and low reversible capacity decay, poor rate capacity, and slow charge storage kinetics severely affect their large-scale applications. In this work, a Bi 2 Se 3 @C rod-like architecture was synthesized through an in situ selenization method using metal−organic frameworks as the precursor. The micro/nanoporous carbon structure not only offers a stable matrix to ensure electrode integrity but also absorbs a large amount of Bi 2 Se 3 changes during repeated lithiation/potassization processes. In addition, the porous structure frame prevents the agglomeration of Bi 2 Se 3 nanoparticles with larger surface energy and shortens the diffusion path of ion transport, thereby improving the rate performance. Therefore, Bi 2 Se 3 @C shows outstanding lithium/potassium storage properties when applied in lithium/potassium-ion batteries. The study of the electrochemical reaction mechanism shows that partial rhombohedral Bi 2 Se 3 transformed into orthorhombic Bi 2 Se 3 after cycling. Pseudocapacitance contribution promotes the enhancement of the specific capacity and rate properties of the Bi 2 Se 3 @C electrode. The excellent electrochemical performance of the Bi 2 Se 3 @C micro/nanostructure shows that it has promising potential as lithium/potassium-ion battery anode materials.