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Metal co‐doping of metal oxide nanostructures is a promising approach for enhancing the electrochemical performance of supercapacitors. Herein, calcium (Ca) and cobalt (Co) co‐doped ZnO capsules (Ca‐Co@ZnO) were fabricated using a facile and single‐step hydrothermal process. The physical, chemical, and morphological properties of the Ca‐Co@ZnO were analyzed using a range of characterization techniques...