Synthesis of Au-V2O5 composite nanowires through the shape transformation of a vanadium(iii) metal complex for high-performance solid-state supercapacitors†,Inorganic Chemistry Frontiers

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Synthesis of Au-V2O5 composite nanowires through the shape transformation of a vanadium(iii) metal complex for high-performance solid-state supercapacitors†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-05-24 00:00:00 , DOI: 10.1039/c8qi00325d
Siddheswar Rudra _{1,

2,

3,

4} , Arpan Kumar Nayak _{4,

5,

6,

7} , Rishika Chakraborty _{1,

2,

3,

4} , Pradip K. Maji _{4,

8,

9,

10} , Mukul Pradhan _{1,

2,

3,

4}

Affiliation

A simple redox transformation between a vanadium(III) metal complex and gold(III) chloride aided by a cost-effective modified hydrothermal procedure has been adopted for the synthesis of Au-V₂O₅ composite nanowires. The stability of pseudocapacitive electrode materials in acidic electrolytes is a major challenge. However, the synthesized Au-V₂O₅ composite nanowires are stable in acidic electrolyte when compared to the precursor component, V₂O₅. Electrochemical measurement shows a specific capacitance of 419 F g⁻¹ at 1 A g⁻¹ current density in 0.5 M H₂SO₄ solution for the synthesized composite nanowires. However, the precursor component V₂O₅ shows a lower specific capacitance under identical conditions. The synthesized composite nanowires, as a pseudocapacitive electrode material, respond to a wide range of working potential windows (+1.6 V), resulting in maximum energy and power densities of 53.33 W h kg⁻¹ and 3.85 kW kg⁻¹ respectively. Moreover, the Au-V₂O₅ nanowires show high cyclic stability (89% specific capacitance retention) for up to 5000 consecutive charge–discharge (CD) cycles at 10 A g⁻¹ constant current density, due to the composite formation by redox transformation, which reflects the stability of the composite in acidic electrolyte.

中文翻译：

通过钒（iii）金属配合物的形状转变，合成用于高性能固态超级电容器的Au-V ₂ O ₅复合纳米线†

通过成本有效的改进水热程序，在钒（III）金属配合物和氯化金（III）之间进行了简单的氧化还原转化，以合成Au-V ₂ O ₅复合纳米线。假电容电极材料在酸性电解质中的稳定性是一个重大挑战。然而，与前体组分V ₂ O ₅相比，合成的Au-V ₂ O ₅复合纳米线在酸性电解质中是稳定的。电化学测量显示，在0.5 MH ₂ SO中，在1 A g ^-1电流密度下的比电容为419 F g ^-1₄解决方案，用于合成复合纳米线。但是，前体成分V₂ O₅在相同条件下显示出较低的比电容。合成的复合纳米线，作为伪电容电极材料，对宽范围的工作电势窗口（+1.6 V）做出响应，分别导致最大能量密度和功率密度分别为53.33 W h kg^-1和3.85 kW kg^-1。此外，Au-V₂ O₅纳米线在10 A g^-1下显示了高达5000个连续的充放电（CD）循环的高循环稳定性（89％的比电容保持率）。恒定的电流密度，这归因于通过氧化还原转化形成的复合材料，这反映了复合材料在酸性电解质中的稳定性。

更新日期：2018-05-24

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