| Mesh-like vertical structures enable both high areal capacity and excellent rate capability |
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| 作者姓名： | Ruyi Chen Jialu Xue Yujiao Gong Chenyang Yu Zengyu Hui Hai Xu Yue Sun Xi Zhao Jianing An Jinyuan Zhou Qiang Chen Gengzhi Sun Wei Huang |
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| 作者单位： | School of Materials Science and Engineering.Henan Polytechnic University;Institute of Advanced Materials（IAM）;Institute of Flexible Electronics（IFE）;Institute of Photonics Technology.Jinan University;School of Physical Science and Technology |
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| 基金项目： | supported by the National Natural Science Foundation of China (Nos. 21975123, 61704076);the Natural Science Basic Research Program of Shaanxi (No. 2020JM-092);the Natural Science Foundation of Jiangsu Province (No. BK20171018);the Six Talent Peaks Project in Jiangsu Province (No. XCL-024);the Fundamental Research Funds for the Central Universities。 |
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| 摘 要： | In order to balance electrochemical kinetics with loading level for achieving efficient energy storage with high areal capacity and good rate capability simultaneously for wearable electronics,herein,2 D meshlike vertical structures(NiCo_2 S_4@Ni(OH)_2) with a high mass loading of 2.17 mg cm-2 and combined merits of both 1 D nanowires and 2 D nanosheets are designed for fabricating flexible hybrid supercapacitors.Particularly,the seamlessly interconnected NiCo_2 S_4 core not only provides high capacity of 287.5 μAh cm-2 but also functions as conductive skeleton for fast electron transport;Ni(OH)_2 sheath occupying the voids in NiCo_2 S_4 meshes contributes extra capacity of 248.4 μAh cm-2;the holey features guarantee rapid ion diffusion along and across NiCO_2 S_4@Ni(OH)_2 meshes.The resultant flexible electrode exhibits a high areal capacity of 535.9 μAh cm-2(246.9 mAh g-1) at 3 mA cm-2 and outstanding rate performance with 84.7% retention at 30 mA cm-2,suggesting efficient utilization of both NiCo_2 S_4 and Ni(OH)_2 with specific capacities approaching to their theoretical values.The flexible solid-state hybrid device based on NiCo_2 S_4@Ni(OH)_2 cathode and Fe_2 O_3 anode delivers a high energy density of 315 μWh cm-2 at the power density of 2.14 mW cm-2 with excellent electrochemical cycling stability.
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| 关 键 词： | Mesh-like structure Ultrahigh areal capacity Excellent rate capability Hybrid supercapacitors Wearable energy storage |
Mesh-like vertical structures enable both high areal capacity and excellent rate capability |
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