Flexible electrochromic energy storage devices (FECESDs) for powering flexible electronics have attracted considerable attention. Silver nanowires (AgNWs) are one kind of the most promising flexible transparent electrodes (FTEs) materials for the emerging flexible devices. Currently, fabricating FECESD based on AgNWs FTEs is still hindered by their intrinsic poor electrochemical stability. To address this issue, a hybrid AgNWs/Co(OH)₂/PEDOT:PSS electrode is proposed. The PEDOT:PSS could not only improve the resistance against electrochemical corrosion of AgNWs, but also work as functional layer to realize the color-changing and energy storage properties. Moreover, the Co(OH)₂ interlayer further improved the color-changing and energy storage performance. Based on the improvement, we assembled the symmetrical FECESDs. Under the same condition, the areal capacitance (0.8 mF cm⁻²) and coloration efficiency (269.80 cm² C⁻¹) of AgNWs/Co(OH)₂/PEDOT:PSS FECESDs were obviously higher than AgNWs/PEDOT:PSS FECESDs. Furthermore, the obtained FECESDs exhibited excellent stability against the mechanical deformation. The areal capacitance remained stable during 1000 times cyclic bending with a 25 mm curvature radius. These results demonstrated the broad application potential of the AgNWs/Co(OH)₂/PEDOT:PSS FECESD for the emerging portable and multifunctional electronics.

Copper nanowires (Cu NWs) are considered an excellent alternative to indium tin oxide (ITO) in flexible transparency electrodes (FTEs). However, the mixed particles and surface oxidation of Cu NWs degrade the transmittance and conductivity of the electrodes. Therefore, highly purified Cu NWs without oxidation are vital for high-performance FTEs. Herein, a facile and effective purification process is introduced to purify Cu NWs in a water and n-hexane system, which takes advantage of the differences in hydrophilicity between Cu NWs and Cu NPs caused by their different adsorption affinities to octadecylamine (ODA). At the same sheet resistance, the transmittance of the purified Cu NW-based FTEs improved approximately 2% compared to that of non-purified Cu NW-based FTEs. Immersion of the electrode in glacial acetic acid removed the surface organics and oxides. After only 40 s of treatment, the sheet resistance dramatically decreased from 10⁵ Ohm/sq to 31 Ohm/sq with a transmittance of 85%. In addition, the Cu NW-based FTE conductors showed excellent flexibility (remaining stable after 1000 bending cycles). The Cu NW-based FTEs were further applied to fabricate a flexible transparent heater. At a voltage of 10 V, the temperature of the heater reached 73 ℃, demonstrating the potential applications of this material in various fields.