Citation: Tong Yongli, Dai Meizhen, Xing Lei, Liu Hengqi, Sun Wanting, Wu Xiang. Asymmetric Hybrid Capacitor Based on NiCo₂O₄ Nanosheets Electrode[J]. Acta Physico-Chimica Sinica, ;2020, 36(7): 190304. doi: 10.3866/PKU.WHXB201903046 shu

Asymmetric Hybrid Capacitor Based on NiCo₂O₄ Nanosheets Electrode

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, P. R. China

Corresponding author: Wu Xiang, wuxiang05@163.com
Received Date: 19 March 2019
Revised Date: 18 April 2019
Accepted Date: 19 April 2019
Available Online: 26 April 2019
Fund Project: The project was supported by the Research Project of Guangdong Province Key Laboratory of Display Material and Technology, China (2017B030314031)the Research Project of Guangdong Province Key Laboratory of Display Material and Technology, China 2017B030314031

The looming global energy crisis and ever-increasing energy demands have catalyzed the development of renewable energy storage systems. In this regard, supercapacitors (SCs) have attracted widespread attention because of their advantageous attributes such as high power density, excellent cycle stability, and environmental friendliness. However, SCs exhibit low energy density and it is important to optimize electrode materials to improve the overall performance of these devices. Among the various electrode materials available, spinel nickel cobaltate (NiCo₂O₄) is particularly interesting because of its excellent theoretical capacitance. Based on the understanding that the performances of the electrode materials strongly depend on their morphologies and structures, in this study, we successfully synthesized NiCo₂O₄ nanosheets on Ni foam via a simple hydrothermal route followed by calcination. The structures and morphologies of the as-synthesized products were characterized by X-ray diffraction, scanning electron microscopy, and Brunauer-Emmett-Teller (BET) surface area analysis, and the results showed that they were uniformly distributed on the Ni foam support. The surface chemical states of the elements in the samples were identified by X-ray photoelectron spectroscopy. The as-synthesized NiCo₂O₄ products were then tested as cathode materials for supercapacitors in a traditional three-electrode system. The electrochemical performances of the NiCo₂O₄ electrode materials were studied and the area capacitance was found to be 1.26 C∙cm^-2 at a current density of 1 mA∙cm^-2. Furthermore, outstanding cycling stability with 97.6% retention of the initial discharge capacitance after 10000 cycles and excellent rate performance (67.5% capacitance retention with the current density from 1 to 14 mA∙cm^-2) were achieved. It was found that the Ni foam supporting the NiCo₂O₄ nanosheets increased the conductivity of the electrode materials. However, it is worth noting that the contribution of nickel foam to the areal capacitance of the electrode materials was almost zero during the charge and discharge processes. To further investigate the practical application of the as-synthesized NiCo₂O₄ nanosheets-based electrode, a device was assembled with the as-prepared samples as the positive electrode and active carbon (AC) as the negative electrode. The assembled supercapacitor showed energy densities of 0.14 and 0.09 Wh∙cm^-3 at 1.56 and 4.5 W∙cm^-3, respectively. Furthermore, it was able to maintain 95% of its initial specific capacitance after 10000 cycles. The excellent electrochemical performance of the NiCo₂O₄ nanosheets could be ascribed to their unique spatial structure composed of interconnected ultrathin nanosheets, which facilitated electron transportation and ion penetration, suggesting their potential applications as electrode materials for high performance supercapacitors. The present synthetic route can be extended to other ternary transition metal oxides/sulfides for future energy storage devices and systems.
- NiCo₂O₄ nanosheet,
- Electrochemical performance,
- Asymmetrical supercapacitor,
- Cathode material,
- Cycle stability
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Asymmetric Hybrid Capacitor Based on NiCo₂O₄ Nanosheets Electrode