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For a parallel‐type fiber AFSC, two fiber‐shaped electrodes are assembled side‐by‐side, separated by gel/polymer electrolyte, and finally supported on a flat substrate [60, 107–109]. For instance, Yu et al. [109] reported a parallel type all‐solid‐state asymmetric micro‐SC using MnO₂‐deposited rGO/SWCNT fiber as the cathode (denoted as GCF/MnO₂‐10) and an N‐doped rGO/SWCNT fiber as the anode (denoted as GCF/N2) (Figure 1.7a). By fully utilizing the potential window of both cathode (0 ~ 0.9 V) and anode (−0.9 ~ 0 V), the device showed a high output voltage of 1.8 V (Figure 1.7b). Excellent electrochemical performances such as good cycling stability (87% capacitance retention after 10 000 cycles), high energy density (5 mW h cm⁻³) and power density (929 mW cm⁻³) were also achieved. Furthermore, such device geometry exhibited promising mechanic stability under different bending states (Figure 1.7c). This asymmetric micro‐SC device was testified as a reliable power source for a ZnO film‐based UV photodetector, suggesting its promising potential in future applications.

Figure 1.7 (a) Schematic illustration of the design and fabrication of the asymmetric fiber‐based micro‐SC. (b) Comparative CV curves obtained for the GCF‐N2 and GCF/MnO₂‐10 fibers at the scan rate of 10 mV s⁻¹. (c) CV curves of one asymmetric micro‐SC, which are bended at different angles.

Source: Reproduced with permission [109]. © 2014, Wiley‐VCH.