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<p>We successfully synthesized a new sodium-manganese paratungstate-B cluster containing compound, Na<sub>2</sub>[{Mn(H<sub>2</sub>O)<sub>3</sub>}<sub>2</sub>{Mn(H<sub>2</sub>O)<sub>4</sub>}<sub>2</sub>{H<sub>2</sub>W<sub>12</sub>O<sub>42</sub>}]·6H<sub>2</sub>O (<b>Na-POM</b>) using a straightforward, one-pot aqueous method. We confirmed its structure using single-crystal X-ray crystallography along with various spectroscopic and microscopic techniques. The {H<sub>2</sub>W<sub>12</sub>O<sub>42</sub>}<sup>10−</sup> cluster unit, which is present in the crystal structure denoted it as a paratungstate-B polyoxometalate (POM). In the concerned crystal structure, the Na<sup>+</sup> cations occupy the interstitial positions between the paratungstate clusters and possibly create pathways that allow Na<sup>+</sup> ions to move relatively easily. This structural advantage prompted us to perform electrochemical studies toward charging and discharging for a possible aqueous alkali metal storage system. <b>Na-POM</b> shows decent cycling stability over 50 cycles, retaining 65% of its initial capacity and delivering a specific discharge capacity of 37 mA h g<sup>−1</sup> at 350 mA g<sup>−1</sup> current density. These findings pave a pathway to use POMs and POM-based materials in the area of energy storage applications, especially in aqueous sodium-ion batteries.</p> Graphical abstract <p>In this work, we have synthesized a Na-Mn-containing paratungstate-B polyoxometalate compound, Na<sub>2</sub>[{Mn(H<sub>2</sub>O)<sub>3</sub>}<sub>2</sub>{Mn(H<sub>2</sub>O)<sub>4</sub>}<sub>2</sub>{H<sub>2</sub>W<sub>12</sub>O<sub>42</sub>}]·6H<sub>2</sub>O (<b>Na-POM</b>), and characterized it by single-crystal X-ray crystallography, including routine spectroscopic and microscopic analyses. Interestingly, <b>Na-POM</b> acts as a storage material, exhibiting a specific discharge capacity of 37 mA h g<sup>−1</sup> at a current density of 350 mA g<sup>−1</sup> in an acidic aqueous NaCl electrolyte.</p> <p></p>

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Paratungstate-type polyoxometalate: Synthesis, crystal structure and electrochemical studies toward a possible storage system

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Shalini Sanjay Mishra,
  • Debu Jana,
  • Samar K Das

摘要

We successfully synthesized a new sodium-manganese paratungstate-B cluster containing compound, Na2[{Mn(H2O)3}2{Mn(H2O)4}2{H2W12O42}]·6H2O (Na-POM) using a straightforward, one-pot aqueous method. We confirmed its structure using single-crystal X-ray crystallography along with various spectroscopic and microscopic techniques. The {H2W12O42}10− cluster unit, which is present in the crystal structure denoted it as a paratungstate-B polyoxometalate (POM). In the concerned crystal structure, the Na+ cations occupy the interstitial positions between the paratungstate clusters and possibly create pathways that allow Na+ ions to move relatively easily. This structural advantage prompted us to perform electrochemical studies toward charging and discharging for a possible aqueous alkali metal storage system. Na-POM shows decent cycling stability over 50 cycles, retaining 65% of its initial capacity and delivering a specific discharge capacity of 37 mA h g−1 at 350 mA g−1 current density. These findings pave a pathway to use POMs and POM-based materials in the area of energy storage applications, especially in aqueous sodium-ion batteries.

Graphical abstract

In this work, we have synthesized a Na-Mn-containing paratungstate-B polyoxometalate compound, Na2[{Mn(H2O)3}2{Mn(H2O)4}2{H2W12O42}]·6H2O (Na-POM), and characterized it by single-crystal X-ray crystallography, including routine spectroscopic and microscopic analyses. Interestingly, Na-POM acts as a storage material, exhibiting a specific discharge capacity of 37 mA h g−1 at a current density of 350 mA g−1 in an acidic aqueous NaCl electrolyte.