Abstract
Transition metal molybdates represent a promising family of electrode materials for supercapacitors and lithium‐ion batteries (LIBs). Herein, Co0.5Ni0.5MoO4 double‐shelled hollow spheres (DSHSs) are synthesized using a simple and scalable spray‐drying method followed by calcination in air. Benefited from the unique hollow structure as well as the coexistence of Co and Ni, the as‐synthesized Co0.5Ni0.5MoO4 DSHSs exhibit an improved pseudocapacitive property with a specific capacitance of 731 F g−1 at 0.5 A g−1 and a high capacitance retention of 91% (10 A g−1) after 5000 cycles. In addition, the obtained Co0.5Ni0.5MoO4 DSHSs also manifest a high specific capacity (900 mAh g−1 at 0.2 A g−1 after 50 cycles) and an excellent cyclability (756 mAh g−1 at 1 A g−1 after 1000 cycles) for lithium storage. This rational design on both component and structure provides an effective strategy to achieve high‐performance supercapacitors and LIBs.
Benefited from the unique hollow structure and the coexistence of Co and Ni, Co0.5Ni0.5MoO4 double‐shelled hollow spheres synthesized by a spray‐drying method demonstrate enhanced electrochemical performance than that of NiMoO4 and CoMoO4 in both supercapacitors (731 F g−1 at 0.5 A g−1, 91% capacitance retention after 5000 cycles) and lithium‐ion batteries (900 mAh g−1 at 0.2 A g−1, retaining 756 mAh g−1 at 1 A g−1 after 1000 cycles).