Solution-based synthesis of carbon-hematite composite thin films for high-performance supercapacitor applications
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unctional Oxides Research Letter
Solution-based synthesis of carbon–hematite composite thin films for high-performance supercapacitor applications Jinzhan Su, Shangpu Liu, Jian Wang, Cong Liu, Yufeng Li, and Dongyang Wu, State Key Laboratory of Multiphase Flow in Power Engineering, International Research Centre for Renewable Energy, Xi’an Jiaotong University, Shaanxi 710049, People’s Republic of China. Address all correspondence to Jinzhan Su at [email protected] (Received 31 August 2016; accepted 18 November 2016)
Abstract Supercapacitor has received intense interest due to its high-charge/discharge rate and high-power density. C/Fe2O3 layer with different C/Fe ratios were synthesized by a solution-based approach for supercapacitor application. The influence of synthesis conditions on their electrochemical performances was investigated. Cobalt was added into C/Fe2O3 and significant improved its performance. The optimal C/Fe2O3 sample gives a high specific capacitance of 85.3 F/g and the addition of Co3O4 further increase the capacitance of obtained C/Fe2O3/Co3O4 to 144.4 F/g at 5 A/g. This work demonstrates an efficient supercapacitor application of low-cost metal oxides and facile solution-based synthesis approach.
Introduction In recent years, the use of fossil fuels has caused serious environmental problems and human health threatens. A promising solution is to develop renewable energy technology to shift society to renewable energy sources.[1] Nevertheless, the renewable energy has disadvantages such as the discontinuous of time and space, low-energy density, and difficulty to be integrated into online power network. So there is a necessity to develop a device to improve the quality and reliability of renewable energy. Furthermore, in the field of electrical car industry, a new battery different from the traditional one for stable and efficient energy storage is also needed. Supercapacitor emerged as a good candidate because of its high-energy density, high-power density, superior charge and discharge rates, and infinite recycle times theoretically.[2] There are three major types of electrode for supercapacitor, which are carbon electrode, metal oxide electrode, and conducting polymer electrode.[3] Carbon electrode has the advantages of high specific surface area and good conductivity. Carbon-based materials such as activated carbon,[4] mesoporous carbon,[5] carbon nanofibers,[6] and graphene[7] are often used. The metal oxide electrode has the feature of good electrochemical performance, which attracts the researchers’ interest.[8] The third type, conducting polymer electrode possesses good electronic conductivity, small resistance, and high specific capacity.[9] Among them, metal oxide received much attention due to its high thermal stability, abundance, and low manufacturing cost.[10] Yang et al.[11] reported a new supercapacitor using MnO2 and Fe2O3 as electrode. Deng et al.[12] synthesized a novel supercapacitor using the Co3O4 particle
prepared by citric acid and cobalt (II) nitrate hexahydrate, whose capacita
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