Quasifractal Networks as Current Collectors for Transparent Flexible Supercapacitors

Abstract

A high performance, transparent, and simultaneously mechanically flexible supercapacitor, with electrodes based on a bio‐inspired, quasifractal metallic network is demonstrated. Excellent performance parameters, such as the specific capacitance of 5.6 mF cm−2 (at 45% transparency), great long‐term electrochemical and mechanical stability under stress, and low cost, make this one of the best reported, and most promising candidates for applications in the wearable, transparent integrated electronics.

Freestanding ultralight metallic micromesh for high-energy density flexible transparent supercapacitors

“…As shown in Fig. 7h, compared with other previously reported FTSCs, 48–56 the as-fabricated asymmetrical NM@NiCoP//PVA/KOH//NM@NPC device shows considerable advantages in terms of comprehensive indicators of capacity and optical transmittance. Furthermore, the all-solid-state asymmetric supercapacitor yields a remarkable energy density of 8.0 μW h cm −2 and power density of 980 μW cm −2 (Fig.…”

A Regenerable Hydrogel Electrolyte for Flexible Supercapacitors

“…The C m decrease with the increase in PANI loading is accordance with the result in three-electrode system. According to the GCD curves collected at a discharge current density of 0.2 mA cm −2 ( Figure 2 B), as-calculated C m values of SC-2.5, SC-5.0, and SC-10 are 17.51 (14.24 mF cm −2 ), 10.14 (20.77 mF cm −2 ), and 10.43 F g −1 (35.46 mF cm −2 ), demonstrating a better charge capability than many reported PVA-based SCs ( Xu et al., 2014 ; Yun et al., 2014 ; Su et al., 2015 ; Chen and Dai, 2016 ; Li et al., 2017 ; Wang et al., 2018a ; Chen et al, 2019b ; Shih et al., 2019 ; Liu et al., 2020 ). Furthermore, their GCD curves exhibit a symmetrical triangular shape with a negligible internal resistance (IR) drop, which further proves an ideal reversible capacitance characteristic and small intrinsic resistance from electrodes and electrolyte.…”

“…Cycle stability is another important feature for the practical application of PAA-PAH electrolyte in SCs. As shown in Figure 2 D, after 5,000 charge-discharge cycles at a current density of 0.2 mA cm −2 , the capacitance retention of SC-2.5, SC-5.0, and SC-10 is 99.95%, 100.0%, and 99.89%, respectively, which presents a superior cycle stability of PAA-PAH/LiCl-based SCs devices than PVA and many other hydrogel electrolytes-based SCs ever reported ( Wang et al., 2014a , 2014b , 2018a , 2018b , 2019 ; Guo et al., 2016 ; Chen et al., 2019a , 2019b ; Liu et al., 2019a , 2019b ; Shih et al., 2019 ; Sun et al., 2019 ).

Figure 2 Electrochemical Characterization of As-assembled Solid-State Supercapacitors (A) CV curves of SC-2.5, SC-5.0, and SC-10 at a scan rate of 50 mV s-1.

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Flexible Transparent Bifunctional Capacitive Sensors with Superior Areal Capacitance and Sensing Capability based on PEDOT:PSS/MXene/Ag Grid Hybrid Electrodes

“…In particular, the energy storage capacity is even better than that of a recently reported high‐performance PPy/Au based FTS fabricated by complicated methods involving chemical etching, ultraviolet lithography and sputtering. [ 25 ] By contrast, the all‐solution processes including printing and coating in this work is more facile and effective for constructing FTSs. Additionally, the FTSs demonstrated excellent cycle stability.…”