A new ammonium vanadium tellurate, (NH(4))(2)[VO(2)](2)[TeO(4)(OH)(2)] (1), was hydrothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, and TG analysis. Compound 1 crystallizes in the monoclinic system, space group P2(1)/n: a = 8.9112(18) A, b = 15.151(3) A, c = 15.187(3) A, beta = 97.91(3)(o), V = 2030.9(7) A(3), Z = 8, R1 (I > 2sigma(I)) = 0.0295, wR2 (all data) = 0.0631. The structure of 1 consists of infinite anionic chains, {[VO(2)](2)[TeO(4)(OH)(2)]}(2-), of edge-sharing VO(5) square pyramids and TeO(4)(OH)(2) octahedra. Two VO(5) square pyramids are joined together by sharing their edge to form a V(2)O(8) binuclear unit. The V(2)O(8) and TeO(4)(OH)(2) units are alternatively connected to each other by sharing their edges to complete infinite zigzag anionic {[VO(2)](2)[TeO(4)(OH)(2)]}(2-) chains. The structure contains an extended network of O-H...O hydrogen bonds between the chains. The network of intermolecular hydrogen bonding results in layers parallel to the ab plane. Ammonium cations are hydrogen-bonded either to the oxygen atoms of the anionic chains or to each other in a complex arrangement.
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Aqueous rechargeable zinc-ion batteries (AZIBs) have drawn enormous attention in stationary applications due to their high safety and low cost. However, the search for new positive electrode materials with satisfactory electrochemical performance for practical applications remains a challenge. In this work, we report a comprehensive study on the use of the vanadium tellurate (NH){(VO)[TeO(OH)]}·2HO, which is tested for the first time as a cathode material in AZIBs.
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