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In article number https://doi.org/10.1002/aenm.201900323, Yi Zeng, Fei Du and co‐workers report the synthesis of a novel cubic phase CuSe crystal pillar which is self‐assembled by nanosheets, together with the dual functionality for high‐rate Na+ and K+ storage. A combination of in‐situ X‐ray diffraction and ex‐situ transmission electron microscopy tests, reveal the structural transition and phase evolution of CuSe that show a reversible conversion reaction for both cells.