Microfluidic-Spinning-Chemistry Strategy toward in-situ Generation of High-Performance Nickel Molybdate/Porous Graphene Carbonene Fiber-based Supercapacitors

Graphene carbonene fiber (GCF) supercapacitors are promising for portable/wearable electronics but suffer from fabrication-induced restacking and uneven hybridization between graphene sheets and hybrid active materials, degrading electrochemical performance and hindering practical applications. Here, an innovative microfluidic-spinning-chemistry (MSC) method is proposed for the in situ construction of the nickel molybdate/porous GCF (NiMoO 4 /PGCF) hybrid, which manifests a large specific surface area, high electrical conductivity, and abundant redox activity, facilitating ion diffusion, and ensuring energy storage and supply. As a result, the NiMoO 4 /PGCFs express an exceptional areal capacitance of 3597.7 mF cm −2 in a three-electrode system. Additionally, this flexible solid-state NiMoO 4 /PGCF supercapacitor presents large areal capacitance (1006.8 mF cm −2 ), ultrahigh energy density (218.5 µWh cm −2 ), and long-term cycling stability (90.2% capacitive retention at 1 mA cm −2 after 20 000 cycles), which is capable of powering a toy windmill without extra recharging by other power sources. Furthermore, a demonstration of a supercapacitive controller using the solid-state NiMoO 4 /PGCF is presented, which could couple with a triode to manage the takeoff of gliding unmanned aircraft. This provides high-efficiency start/stop control and safety redundancy for gliding unmanned aircraft, while also paving the way for the innovation of next-generation gliding unmanned aircraft energy management and control systems.