Engineering onion-like nanoporous CuCo2O4 hollow spheres derived from bimetal–organic frameworks for high-performance asymmetric supercapacitors†,Journal of Materials Chemistry A

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Engineering onion-like nanoporous CuCo2O4 hollow spheres derived from bimetal–organic frameworks for high-performance asymmetric supercapacitors†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-05-08 00:00:00 , DOI: 10.1039/c8ta02819b
Ali A. Ensafi _{1,

2,

3,

4} , Seyyed Ebrahim Moosavifard _{1,

2,

3,

4} , B. Rezaei _{1,

2,

3,

4} , Saeid Kamari Kaverlavani _{1,

2,

3,

4}

Affiliation

Engineering complex hollow nanostructures of mixed transition metal oxides is necessary to respond to the increasing progress of modern electronics. As an interesting spinel mixed metal oxide, for the first time, we engineer onion-like nanoporous CuCo₂O₄ hollow spheres (ON-CCO) with a high surface area of 63 m² g⁻¹ and more than six thin shells. It is derived from bimetal–organic frameworks for high-performance asymmetric supercapacitors. The ON-CCO electrode exhibits excellent electrochemical performance including high reversibility, fast kinetics, low internal resistance, and an ultrahigh specific capacitance of 1700 F g⁻¹ with an excellent rate capability of 68% after increasing the current density by a factor of 50. Furthermore, the as-prepared ON-CCO//AC asymmetric supercapacitor delivers significant performance consisting of excellent cycle life (only 8.8% loss after 10 000 charge/discharge cycles), a maximum energy density of 48.75 W h kg⁻¹ and a power density of up to 37.5 kW kg⁻¹, which is superior to conventional supercapacitors and can compete with Ni–MH batteries. This remarkable performance attributed to the unique structural properties of the ON-CCO electrode holds great promise for the next-generation of high-performance portable electronics and electric vehicles.

中文翻译：

从双金属有机框架衍生出的类似洋葱的纳米多孔CuCo ₂ O ₄空心工程球，用于高性能不对称超级电容器†

为了应对现代电子技术的不断进步，必须对混合过渡金属氧化物进行复杂的中空纳米结构工程设计。作为一种有趣的尖晶石混合金属氧化物，我们首次设计了洋葱状纳米多孔CuCo ₂ O ₄中空球（ON-CCO），具有63 m ² g ^-1的高表面积和六个以上的薄壳。它源自高性能非对称超级电容器的双金属有机框架。ON-CCO电极具有出色的电化学性能，包括高可逆性，快速动力学，低内阻和1700 F g ^-1的超高比电容在将电流密度增加50倍后，具有68％的出色倍率能力。此外，所制备的ON-CCO // AC不对称超级电容器具有显着的性能，包括出色的循环寿命（10000次充电后损耗仅为8.8％） /放电循环），最大能量密度为48.75 W h kg ^-1，功率密度高达37.5 kW kg ^-1，优于传统的超级电容器，可与Ni-MH电池竞争。这种卓越的性能归因于ON-CCO电极的独特结构特性，对下一代高性能便携式电子产品和电动汽车具有广阔的前景。

更新日期：2018-05-08

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