Abstract
Coordination polymers (CPs) and metal–organic frameworks (MOFs) have been widely used in the preparation of hollow micro-/nanomaterials as templates and precursors. Herein, the mesoporous Ni2CoS4 were prepared by means of a two-step hydrothermal strategy from new-type Ni/Co-nicotinate CPs-based bricks. The as-preparede Ni2CoS4 electrode displays a high capacity (1466.8 F g−1 at 1 A g−1) and 70.1% capacity retention after 2000 cycles. The asymmetric supercapacitor (ASC) device was assembled by using Ni2CoS4 as positive electrode and activated carbon (AC) as negative electrode, and the energy density of Ni2CoS4//AC ASC can reach 37.8 Wh kg−1 at the power density of 1066.8 W kg−1. Meawhile, the Ni2CoS4//AC ASC also shows long-term stability up to 113.7% after 10,000 cycles. The excellent electrochemical performances indicate that as-obtained mesoporous Ni2CoS4 can be a promising candidate as electrode material for supercapacitors.
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