科研之友
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摘要
Highly-ordered mesoporous spinel ZnCo2O4 (HOM-ZnCo2O4) with controlled morphology, high surface area and narrow pore size distribution is prepared through a facile infiltration route with molecular sieve SBA-15 as templates for the first time. At the same time, nanostructured porous spherical spinel ZnCo2O4 (NPS-ZnCo2O4) framework is also synthesized using silicon spheres as templates. HOM-ZnCo2O4 is revealed to have a highly ordered mesoporous structure with a pore diameter of similar to 4 nm and a high surface area of 112.0 m(2) g (1), while NPS-ZnCo2O4 is a framework containing 3D connected pores with a diameter of similar to 100 nm and surface area of 88.4 m(2) g (1). As the anode material, HOM-ZnCo2O4 displays a high reversible specific capacity up to 1623 mA h g (1), similar to 300 mA h g (1) larger than NPS-ZnCo2O4 (1286 mA h g (1)), at a current density of 2.0 Ag (1). When applying a high current density of 8.0 A g (1), the capacity of HOM-ZnCo2O4 still remains at a high level of 1470 mA h g (1), but NPS-ZnCo2O4 undergoes a severe degradation to 751 mA h g (1). The large specific surface area contributes much to the better rate performance of the former because it provides a larger cross section for Li+ flux. Also, the small pore size may be more in favor of maintaining the structural stability of porous spinel material than the large one. Aside from its nanostructured characteristics, an inner atomic synergistic effect within the cubic lattices may account for the superior electrochemical performance of HOM-ZnCo2O4. HOM-ZnCo2O4 that exhibits high capacities and well stability is a kind of competitive anode materials and highly-ordered mesoporous structure is superior in electrode design.
- 出版日期2016-4-10
- 单位山东大学
