Hierarchical Micro-Mesoporous Carbon Frameworks-Based Hybrid Nanofibres for High-Dense Capacitive Energy Storage.

Advanced methods, allowing the controllable synthesis of ordered structural nanomaterials with favorable charges transfer and storage, are highly important to achieve ideal supercapacitors with high energy density. Here, we report a microliter droplet-based method to stably synthesize hierarchical-structured metal-organic frameworks/graphene/carbon nanotubes hybrids. Due to the confined ultra-small-volume reaction, the well-defined hybrids possess large specific-surface-area (1206 m 2 g -1 ), abundant ionic-channels (narrow pore of 0.86 nm) and nitrogen active-sites (10.63%), creating high pore-size utilization (97.9%) and redox-activity (32.3%). We also propose a scalable microfluidic-blow-spinning method to consecutively generate nanofibre-based flexible supercapacitor electrodes with striking flexibility and mechanical strength. The supercapacitors display large volumetric energy density (147.5 mWh cm -3 ), high specific capacitance (472 F cm -3 ) and stably deformable energy-supply. Based on those outstanding features, a self-powered system that directly converts and stores solar-energy into electric-energy is designed to power displays, which will guide the progress of new electrodes architecture and energy-storage industry.