Modern technological requirements emphasize designing and manufacturing electrochemical energy storage devices with high energy and power densities and longer cycle life. Supercapacitors with hybrid electrode materials have gained considerable attention as one of these systems due to their potential usage in futuristic applications such as electric vehicles and smart electric grids, among others. In this work, we synthesize potassium 9-tungsto-2-molybdo-1-vanadosilicate K[α-SiMoVWO]⋅10HO and graphene oxide (GO) complex treating the latter as the supporting matrix for the former. We prepare the SiMoVW-polypyrrole (PPy) complex and then combine that with the GO matrix. The resulting nanohybrids GO-SiMoVW and GO-PPy/SiMoVW are found to have enhanced electrochemical properties when used in symmetric cells. Combining GO and pseudocapacitive materials can augment SC performance owing to their excellent redox properties. GO-SiMoVW and GO-PPy/SiMoVW showed 55.8 % and 85.5 % capacitive behavior at a scan rate of 10 mV/s, suggesting their use as high-performance pseudocapacitive materials as hybrid electrodes. GO-PPy/SiMoVW electrode material shows a specific capacitance of 351.6 F/g with energy and power densities of 48.83 Wh/kg and 999.93 W/kg, respectively, at 0.5 A/g current density. Both the electrode materials yield capacitance retention of 60 % (GO-SiMoVW) and 80 % (GO-PPy/SiMoVW) after 5000 cycles at an 8A/g current density with almost 100 % coulombic efficiency, implying the stability of the electrode material.

中文翻译：

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多金属氧酸盐植入氧化石墨烯基体与聚吡咯的赝电容效应，用于对称超级电容器应用

现代技术要求强调设计和制造具有高能量和功率密度以及更长循环寿命的电化学储能装置。采用混合电极材料的超级电容器作为这些系统之一，由于其在电动汽车和智能电网等未来应用中的潜在用途而受到了广泛关注。在这项工作中，我们合成了 9-tungsto-2-molybdo-1-vanadosilicate 钾 K[α-SiMoVWO]⋅10HO 和氧化石墨烯 (GO) 复合物，后者作为前者的支撑基质。我们制备 SiMoVW-聚吡咯 (PPy) 复合物，然后将其与 GO 矩阵结合。研究发现，所得纳米杂化物 GO-SiMoVW 和 GO-PPy/SiMoVW 在用于对称电池时具有增强的电化学性能。 GO 和赝电容材料的结合可以增强 SC 性能，因为它们具有优异的氧化还原性能。 GO-SiMoVW 和 GO-PPy/SiMoVW 在 10 mV/s 的扫描速率下表现出 55.8 % 和 85.5 % 的电容行为，表明它们可用作混合电极的高性能赝电容材料。 GO-PPy/SiMoVW电极材料在0.5 A/g电流密度下的比电容为351.6 F/g，能量和功率密度分别为48.83 Wh/kg和999.93 W/kg。在 8A/g 电流密度下循环 5000 次后，两种电极材料的电容保持率为 60% (GO-SiMoVW) 和 80% (GO-PPy/SiMoVW)，库伦效率几乎为 100%，这表明电极材料的稳定性。