Schiff base-assisted hydrothermal synthesis and characterization of manganese vanadate with varying phase purity nanostructures as efficient electrode materials for electrochemical hydrogen storage applications

• Nanostructures manganese vanadate synthesized using a tripodal tetraamine ligand. • Comparing study on phase purity of manganese vanadate by changing molar ratio of precursors. • Appraisal of structural integrity, microstrain, and electrochemical properties. • Mn(VO 3 ) 2 nanostructures confirmations maximum capacity of 507 mAhg -1 after 20 cycles. Hydrothermal manufacturing of manganese vanadate nanostructures in the presence of ligand as capping agent which employed as electrode materials with custom form was achieved. Different settings produced samples with different content, phase purity and shape. Structural properties investigated by XRD, FT-IR, EDX, FE-SEM, TEM and BET. Activity of electrode materials with various phase purities was compared using the charge-discharge test. The manufactured Mn(VO 3 ) 2 (MV2) shows a capacity of 507 mAhg -1 after 20 cycles at a current density of 1 mA. Other synthesized samples MV3 and MV4 with phase content of Mn 2 V 2 O 7 and Mn(VO 3 ) 2 represents capacity in maximum level (20th cycle) 250 and 435 mAhg -1 , respectively. So, sample MV2 shows higher electrochemical hydrogen storage capacity which synthesized by assembling nanoparticles to form of small sheets.