Mesoporous manganese-selenide microflowers with enhanced electrochemical performance as a flexible symmetric 1.8 V supercapacitor

Single-phase hierarchical manganese selenide (alpha-MnSe) microflowers assembled by nanosheets were synthesized through a facile-solvothermal strategy and applied for symmetrical supercapacitor's electrode material for the first time. The alpha-MnSe microflowers supported on carbon textile exhibit well balanced capacitive (56.85%) and surface-redox charge storage (43.15%) in aqueous electrolyte. Interestingly, the all-solid-state flexible symmetric supercapacitor (SSC) based on alpha-MnSe electrodes can operate at high potential (1.8 V) and exhibits outstanding electrochemical performance (200 F g(-1) and 55.42 Wh kg(-1) at 1 A g(-1)) with excellent cycling stability (97.15%) over 5000 cycles and surpasses all previously reported symmetric and asymmetric SCs based on MnSe.