Dual-functional NiCo₂S₄ polyhedral architectures with outstanding electrochemical performance for supercapacitors and lithium-ion batteries (LIBs) have been rationally designed and successfully synthesized by a hydrothermal method. The as-synthesized NiCo₂S₄ electrode for supercapacitor exhibit an outstanding specific capacitance of 1298 F g^–1 at 1 A g^–1 and an excellent rate capability of ∼80.4% at 20 A g^–1. Besides, capacitance retention of 90.44% is realized after 8000 cycles. In addition, the NiCo₂S₄ as anode in LIBs delivers high initial charge/discharge capacities of 807.6 and 972.8 mAh g^–1 at 0.5 C as well as good rate capability. In view of these points, this work provides a feasible pathway for assembling electrodes and devices with excellent electrochemical properties in the next generation energy storage applications.

合理设计并通过水热法成功合成了具有出色电化学性能的超级电容器和锂离子电池（LIB）双功能NiCo ₂ S ₄多面体结构。超级电容器的合成NiCo ₂ S ₄电极在1 A g ^–1时具有1298 F g ^–1的出色比电容，在20 A g ^–1时具有约80.4％的优良倍率能力。此外，经过8000次循环后，电容保持率达到90.44％。此外，作为LIB阳极的NiCo ₂ S ₄可提供807.6和972.8 mAh g的高初始充放电容量0.5 C时为^–1，并且具有良好的速率能力。有鉴于此，这项工作为在下一代储能应用中组装具有优异电化学性能的电极和装置提供了可行的途径。