| An Aqueous All-Metal Oxide Asymmetric Supercapacitor with High Gravimetric and Volumetric Energy Densities; [兼具高质 ?和高体积能 ?密度的水系 全金属氧化物 ?对称超级电容器]北大核心CSCD |
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| 作者单位： | 1.School of Materials Science and Engineering, Ocean University of China, Shandong, Qingdao266100;2.Qingdao Center of Resource Chemistry and New Materials, Shandong, Qingdao266000;3.Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Gansu, Lanzhou730000; |
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| 基金项目： | Independent Innovation Plan Foundations of Qingdao City of China, (16-5-1-42-jch)；National Natural Science Foundation of China, NSFC, (21673263, 51572247)；Natural Science Foundation of Shandong Province, (ZR2014EMM003) |
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| 摘 要： | Only with both high gravimetric and high volumetric energy densities, can supercapacitors find more extensive applications. In this paper, by making good use of the interesting nanostructures and the high packing densities of a2(nanoshpheres,1.69 g·cm-3) and Co-Ni oxide (nanoflakes, 2.14 g · cm-3), the RuO2//KOH//Co-Ni oxide all-metal oxide asymmetric supercapacitors with high performance were successfully fabricated, which led to the maximum specific capacitance of 217.5 F·g-1 (412.3 F·cm-3) and specific energy density of 61.8 Wh·kg-1(121 Wh·L-1)in a cell voltage between 0 and 1.5 V in KOH electrolyte. In addition, the constructed supercapacitor device could retain 87% of the initial specific capacitance even at 5000th cycle with the cell voltage of 1.4 V at a current density of 2 A·g-1in life cycle test, indicating high electrochemical stability. © Journal of Electrochemistry 2018.
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