Abstract

Herein, hybrid CoMoO₄–NiMoO₄ nanosheets (NSs) with mesoporous morphology were assembled using a chitosan hydrogel assisted calcination method. This unique architecture provides numerous channels for rapid diffusion of electrolyte ions, fast electron transfer and high electrochemical activity due to the synergistic effect between the CoMoO₄ and NiMoO₄. The assembled CoMoO₄–NiMoO₄ hybrid material can be a very good supercapacitor electrode, due to its high specific capacitance of 1940 F g⁻¹ at the current density of 1 A g⁻¹. Even at a current density as high as 20 A g⁻¹, the CoMoO₄–NiMoO₄ electrode still delivers a high specific capacitance of 1280 F g⁻¹, indicating its superior rate of specific capacitance 65.98% and excellent cycling stability with capacitance retention 99% after 5000 cycles. Furthermore, the as-prepared CoMoO₄–NiMoO₄ was employed as anode and activated carbon was used as cathode for solid-state asymmetric supercapacitor. Asymmetric supercapacitors with high power density and energy density (53.33 W h kg⁻¹ at a power density of 800 W kg⁻¹) were realized by improving the potential window with the voltage range from 0 to 1.6 V. These results indicate that the CoMoO₄–NiMoO₄ electrode shows potential application for high performance, environmentally friendly, and low-cost energy storage device.

The hybrid CoMoO₄–NiMoO₄ nanosheets with mesoporous morphology were assembled using chitosan hydrogel assisted calcinations method. This unique architecture composites exhibit high specific capacitance of 1940 F g⁻¹ at the current density of 1 A g⁻¹. Even at current density as high as 20 A g⁻¹, the CoMoO₄–NiMoO₄ electrode still delivers a high specific capacitance of 1280 F g⁻¹, indicating its superior rate of specific capacitance 65.98%.

中文翻译：

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壳聚糖水凝胶辅助煅烧法制备高电化学性能的CoMoO 4 -NiMoO 4杂化纳米片

摘要

在这里，使用壳聚糖水凝胶辅助煅烧方法组装了具有中孔形态的杂化CoMoO ₄ -NiMoO ₄纳米片（NSs）。由于CoMoO ₄和NiMoO ₄之间的协同作用，这种独特的体系结构为电解质离子的快速扩散，快速的电子转移和高电化学活性提供了许多通道。组装后的CoMoO ₄ -NiMoO ₄杂化材料可以成为非常好的超级电容器电极，这是因为其在1 A g ^-1的电流密度下具有1940 F g ^-1的高比电容。即使在电流密度高达20 A g ^-1时，CoMoO ₄–NiMoO ₄电极仍可提供1280 F g ^-1的高比电容，这表明它的比电容比率高达65.98％，并且具有出色的循环稳定性，在5000次循环后电容保持率为99％。此外，固态非对称超级电容器使用制备好的CoMoO ₄ -NiMoO ₄作为阳极，活性炭用作阴极。通过在0至1.6 V的电压范围内改善电势窗口，实现了具有高功率密度和能量密度（功率密度为800 W kg ^-1时为53.33 W h kg ^-1）的非对称超级电容器。这些结果表明CoMoO ₄ –NiMoO ₄ 电极显示出高性能，环保和低成本储能设备的潜在应用。