▎ 摘　　要

Faradaic transition-metal-oxide/hydroxide (TMH) materials are critical for high-performance super capacitors. However, the preparation of transparent micro-structured TMH electrodes is a great challenge and has become the bottleneck restricting the performance of transparent flexible supercapacitors. Here, Ni(OH)(2) nanosheets and amorphous FeOOH nanowires were simply synthesized as micro-structured transparent films through a scalable gas-liquid diffusion method at the air-solution interface. The microstructures are enwrapped in graphene shells (Ni@Gr-TF and Fe@Gr-TF) for increasing rapid 3D electron/ion transport pathways, alleviating the exfoliation and dissolution of active materials into the electrolyte, and extending the potential window of the FeOOH cathode to -1.25-0 V. An asymmetric transparent and flexible supercapacitor (ATFS) based on Ni@Gr-TF//Fe@Gr-TF exhibited a transmittance of 52.3% at 550 nm, a high specific capacity of 17.42 mF cm(-2) at 0.2 mA cm(-2) (one order higher than the maximum value reported for a transparent graphene membrane), an energy density of 0.67 mWh cm(-3) based on the entire device (comparable with nontransparent devices) as well as a high capacity retention (85.1%) after a long cycle life of 20 000 cycles. (C) 2017 Elsevier B.V. All rights reserved.