A high-performance asymmetric supercapacitor consists of binder free electrode materials of bimetallic hydrogen phosphate (MnCo(HPO4)) hexagonal tubes and graphene ink

Novel bimetallic manganese-cobalt hydrogen phosphate (Mn
Co (HPO )) hexagonal tubes were efficiently prepared bya direct and simple chemical bath deposition (CBD) procedure. The prepared Mn Co (HPO ) materials have beenanalysed through Fourier transform infrared (FT-IR), hermogravimetric analysis (TGA), and X-ray diffraction (XRD)methods. The surface morphology and the particle size of the materials were studied using field emission scanningelectron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM). The exturalcharacteristics and elemental composition of the Mn
Co (HPO ) were measured using nitrogen sorption isotherms andX-ray photoelectron spectroscopy (XPS) analysis. Owing to its unique hexagonal structures and porous nature, theMn
Co (HPO ) electrode is measured via a three-electrode system and achieved the highest specific capacitance of1,727 F g
at the current density of 1.0 A g . An aqueous asymmetric supercapacitor (AAS), Mn Co (HPO )//G-inkdevice based on Mn
Co (HPO ) as the cathode and graphene ink (G-ink) as an anode material. The fabricated devicemight function well in a large operating potential window of +1.6 V. The Mn Co
(HPO )//G-ink AAS exhibited themaximum power and specific energy of 9,000 W kg and 56.16 Wh kg , correspondingly at 1.0 A g . Furthermore,the fabricated device could withstand 95.5% of its primary capacitance after 5,000 galvanostatic charge/discharge(GCD) turns, which illustrates that the materials could be a prominent contender for supercapacitor applications.