Although flexible supercapacitors have important applications, the development of high-performance flexible supercapacitors still remains a critical challenge owing to the low ion diffusion rate, poor electro-conductivity, and limited active defect sites. Herein, we report the first amorphous MoS_x nanoparticles grown on crystalline FeCo-based nanoneedles (FC@MS-EG) via an ethylene glycol-induced strategy. The FC@MS-EG electrode presents an unprecedented specific capacitance of 1956 F g⁻¹ at 1 A g⁻¹ and over 91.1% of capacitance retention even after 6000 cycles because of the unique morphology, the rich defect sites, the high carrier concentration. The FC@MS-EG//AC asymmetric supercapacitor delivers an ultrahigh specific capacitance of 282 F g⁻¹ at 1 A g⁻¹ and an excellent energy density of 88.09 Wh kg⁻¹ along with a power density of 750 W kg⁻¹. And the self-assembled flexible all-solid-state supercapacitor device can be easily bent and twisted with negligible electrochemical properties attenuation.

尽管柔性超级电容器具有重要的应用，但由于离子扩散速率低，导电性差以及有源缺陷位点有限，高性能柔性超级电容器的开发仍然是一个严峻的挑战。在这里，我们报告通过乙二醇诱导的策略在结晶的FeCo基纳米针（FC @ MS-EG）上生长的第一个非晶MoS _x纳米颗粒。FC @ MS-EG电极在1 A g ^-1时呈现出前所未有的1956 F g ^-1的比电容由于独特的形态，丰富的缺陷部位和高载流子浓度，甚至在6000次循环后仍具有超过91.1％的电容保持率。FC @ MS-EG // AC非对称超级电容器在1 A g ^-1时可提供282 F g ^-1的超高比电容，并具有88.09 Wh kg ^-1的出色能量密度以及750 W kg ^-1的功率密度。并且，自组装的柔性全固态超级电容器器件可以容易地弯曲和扭曲，而电化学性能的衰减可忽略不计。