【摘要】 采用一步水热法，调整不同的草酸含量制备了NH₄V₄O₁₀（NVO）样品，并研究其作为水系锌离子电池正极材料的电化学性能．实验发现：草酸的浓度在决定样品组成上起到了关键性作用．当浓度较低时，得到NVO和（NH₄）₂V₄O₉的混合相；草酸浓度过高则会导致VO₂的生成．当偏钒酸铵与草酸的摩尔比保持在1:1时，成功合成了纯相NVO．电化学测试结果表明：纯相NVO在0.2 A·g^-1的电流密度下，比容量达到了479.3 mAh·g^-1，性能显著优于其它样品．此外，该材料在0.1 mV·s^-1的扫描速率下，赝电容贡献率高达82.48%.更多还原

【Abstract】 Using one-step hydrothermal method and adjusting the content of oxalic acid, NH₄V₄O₁₀（NVO） samples were prepared, and their electrochemical properties as potential cathode materials for aqueous zinc-ion batteries were studied. The concentration of oxalic acid played a pivotal role in determining the resultant phase of the product. At lower concentrations, a mix of NVO and （NH₄）₂V₄O₉ phases emerged, while an excess of oxalic acid led to the formation of VO₂. A balanced ammonium metavanadate and oxalic acid ratio of 1:1 produced a pure NVO phase. Electrochemical analyses highlighted that this singlephase NVO demonstrated a remarkable specific capacity of 479.3 m Ah·g^-1 at 0.2 A·g^-1, outperforming other compositions.Moreover, the material showcased a high pseudo capacitive contribution rate of 82.48% at 0.1 mV·s^-1.更多还原