1 research outputs found
Spinel Nickel Cobaltite Mesostructures Assembled from Ultrathin Nanosheets for High-Performance Electrochemical Energy Storage
Transition
metal oxides (TMOs) are promising electrode materials for advanced
electrochemical energy storage (EES) due to their high theoretical
capacities, but they usually exhibit quite poor practical performance.
There is a pressing need to boost their EES performance by electrode
engineering directed with a well-defined structure–performance
relationship. Herein, we report an efficient approach to improve the
specific capacitance and high-rate capability of spinel nickel cobaltite
by constructing three-dimensional (3D) hierarchical porous mesostructures.
The optimal Ni<sub>1.4</sub>Co<sub>1.6</sub>O<sub>4</sub> mesostructures
assembled from ultrathin nanosheets exhibit high capacitance (2282
F g<sup>–1</sup> at 1 A g<sup>–1</sup>), excellent
high-rate capability (1234 F g<sup>–1</sup> at 50 A g<sup>–1</sup>) and good cycling performance, which are significantly superior
to the Co<sub>3</sub>O<sub>4</sub> mesostructure counterparts, Ni<sub>1.4</sub>Co<sub>1.6</sub>O<sub>4</sub> mesostructures assembled from
nanowires, and randomly packed Ni<sub>1.4</sub>Co<sub>1.6</sub>O<sub>4</sub> nanosheets. The excellent performance is attributed to the
stable hierarchical porous architecture which enables a large electroactive
area and synergistically enhanced electrolyte access, solid-state
ion diffusion, and electron transfer. This tactic of constructing
a 3D mesostructured electrode with enhanced charge transport can be
generalized to other TMOs for improving their EES performances