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high specific capacitance of 1.66 F cm
−2 even at 20 mA cm
−2 (Yu et al. 2012). Another
experiment reported hierarchical M(OH) 2 /MnO 2 nanofibrils/nanowire array, where
a layer of MnO 2 nanofibrils was fabricated on the surface of the individual MnO 2
nanowire. Using aqueous electrolyte, material shows high specific capacitance of
174 F/g at 250 mV/s and 298 F/g at 50 mV/s and maintained 85.2% of its capacitance after 1000 cycles (Duay et al. 2013). Hierarchical mesoporous spinel NiCo 2 O 4
nanowires made via facile hydrothermal method delivered a high specific capacitance of 2876 F g
−1 at a current density of 1 A g
−1 and retained 84.7% after 500
cycles (Yedluri and Kim 2019). In another case, a new class of hierarchical 1-D
nano-doped porous carbon nanowhiskers on CNFs was prepared through the polymerization of aniline on the CNFs and then annealing the nanocomposite in the N 2
atmosphere at high temperature. When used as supercapacitor electrode, NHCNs
and KOH-activated NHCNs carbonized at 750 °C show the optimal specific capacitances of 210.1 and 254.3 F g
−1 , respectively. This result shows that NHCNs are a
very promising electrode.
Yu and Thomas have reported CuO@AuPd@MnO 2 core/shell NWs-based hierarchical electrode (shown in Fig. 9) for supercapacitor with improved performance.
Fig. 9 a Schematic illustration of the CuO@AuPd@MnO 2 NWs fabrication process, b, c SEM
images of CuO@AuPd@MnO 2 NWs hierarchical structures. Reprinted with permission from (Yang
et al. 2009). Copyright (2019) Wiley Online Library
R. R. Deshmukh et al.
high specific capacitance of 1.66 F cm
−2 even at 20 mA cm
−2 (Yu et al. 2012). Another
experiment reported hierarchical M(OH) 2 /MnO 2 nanofibrils/nanowire array, where
a layer of MnO 2 nanofibrils was fabricated on the surface of the individual MnO 2
nanowire. Using aqueous electrolyte, material shows high specific capacitance of
174 F/g at 250 mV/s and 298 F/g at 50 mV/s and maintained 85.2% of its capacitance after 1000 cycles (Duay et al. 2013). Hierarchical mesoporous spinel NiCo 2 O 4
nanowires made via facile hydrothermal method delivered a high specific capacitance of 2876 F g
−1 at a current density of 1 A g
−1 and retained 84.7% after 500
cycles (Yedluri and Kim 2019). In another case, a new class of hierarchical 1-D
nano-doped porous carbon nanowhiskers on CNFs was prepared through the polymerization of aniline on the CNFs and then annealing the nanocomposite in the N 2
atmosphere at high temperature. When used as supercapacitor electrode, NHCNs
and KOH-activated NHCNs carbonized at 750 °C show the optimal specific capacitances of 210.1 and 254.3 F g
−1 , respectively. This result shows that NHCNs are a
very promising electrode.
Yu and Thomas have reported CuO@AuPd@MnO 2 core/shell NWs-based hierarchical electrode (shown in Fig. 9) for supercapacitor with improved performance.
Fig. 9 a Schematic illustration of the CuO@AuPd@MnO 2 NWs fabrication process, b, c SEM
images of CuO@AuPd@MnO 2 NWs hierarchical structures. Reprinted with permission from (Yang
et al. 2009). Copyright (2019) Wiley Online Library