Crystal structure and electrochemistry properties of one two-dimensional heteropolyoxoniobate based on four- and five-vanadium-capped Keggin anions

Abstract

One two-dimensional heteropolyoxoniobate compound H₉[Cu(H₄dap)₂(H₂O)]₈{K[Cu(H₃dap)₂]₄}₂[VNb₁₂O₄₀(VO)₄]₃[VNb₁₂O₄₀(VO)₄(VO)]·48H₂O (1) (H₄dap = 1,2-diaminopropane) was obtained by a hydrothermal method. In this mixed 2D layer, the ratio of four- and five-vanadium-capped Keggin heteropolyoxoniobates is 3 : 1. Compound 1 shows good electrocatalytic properties toward the redox of H₂O₂ and NaNO₂, as well as dopamine hydrochloride (DA) and ascorbic acid (AA).