一步水热合成具有高优异性能的W₁₈O₄₉纳米线/Ti₃C₂T_x纳米片复合材料用于超级电容器的相关研究

One-Step Hydrothermal Synthesis of W₁₈O₄₉ NWs/Ti₃C₂T_x Nanosheets Composites with Superior Performance for Advanced Supercapacitors

摘要: 近年来，超级电容器作为功率型能源储存装置因具有高功率密度、快速充放电速率、长循环寿命等优点，备受研究者们的关注，其优异性能的关键在于电极材料的选择。目前，W₁₈O₄₉纳米结构被誉为最有潜力的超级电容器电极材料。本文通过一步水热法成功合成海胆状的W₁₈O₄₉纳米结构，并在此基础上进一步合成W₁₈O₄₉纳米线/Ti₃C₂T_x纳米片复合材料。该材料不仅提高了W₁₈O₄₉纳米结构的导电性，同时抑制Ti₃C₂T_x纳米片的堆叠，从而显示出极好的储存性能。扫速为1 mV∙s⁻¹时，其比电容值为410 F∙g⁻¹；扫速在50 mV∙s⁻¹时，其比容量为349 F∙g⁻¹。在5 A∙g⁻¹的电流密度下，循环8000次的循环保持率为88%，有着优异的循环稳定性。本工作探究了复合材料作为超级电容器电极优越的电化学性能，为其在电化学储能器件中的应用提供了新的方向。

Abstract: In recent years, as a power-based energy storage device, supercapacitors have attracted researchers’ attention due to their ad-vantages such as higher power density, fast charge and discharge rate and long cycle life. The key to their excellent performance lies in the selection of electrode materials. At present, W₁₈O₄₉ nanostructures are regarded as the most potential electrode material for supercapacitors. In this paper, sea urchin-like W18O49 nanostructures were successfully synthesized by one-step hydro-thermal method, and W₁₈O₄₉ NWs/Ti₃C₂T_x nanosheets composites were further synthesized on this basis. This material not only improves the electrical conductivity of W18O49 nanostructures, but also inhibits the stacking of Ti₃C₂T_x nanosheets, thus showing excellent storage performance. When the sweep speed is 1 mV∙s⁻¹, the specific capacitance value is 410 F∙g⁻¹; When the sweep speed is 50 mV∙s⁻¹, the specific capacity is 349 F∙g⁻¹. Under the current density of 5 A∙g−1, the cycle retention rate of 8000 cycles is 88%, which has excellent stability. This work explores the superior electro-chemical performance of composite materials as electrodes for supercapacitors and provides a new direction for their application in electrochemical energy storage devices.