Highly porous nanostructures having large specific surface areas are very desirable for electrochemical supercapacitors to achieve a large energy storage capacity. We synthesized porous Co-doped TiO₂ nanostructures with an average diameter of 450 nm through a simple solvothermal method by using tetrabutyl titanate and cobalt acetate as precursors and polystyrene beads as templates. The optimized 7% Co-doped TiO₂ nanostructures-based supercapacitor electrodes exhibited a specific capacitance of 352 F g^-1 at a current density of 0.5 A g⁻¹ while retaining a capacity of 97.2% after 3000 cycles. This excellent electrochemical performance may be ascribed to the synergistic effects originating from conductivity enhancement of TiO₂ through optimized Co-doping and larger specific surface areas rendered by structural porosity, when compared to the undoped TiO₂ samples. Our results suggest that porous Co-doped TiO₂ nanostructures can be explored for potential electrochemical applications.

对于电化学超级电容器而言，具有大的比表面积的高度多孔的纳米结构是非常期望的，以实现大的能量存储能力。我们以钛酸四丁酯和醋酸钴为前驱体，以聚苯乙烯珠为模板，通过简单的溶剂热法合成了平均直径为450 nm的多孔共掺杂TiO ₂纳米结构。经过优化的7％Co掺杂的TiO ₂纳米结构基超级电容器电极在 0.5 A g ^-1的电流密度下显示出352 F g ^-1的比电容，而在3000次循环后仍保持97.2％的容量。这种出色的电化学性能可归因于TiO导电性增强产生的协同效应₂通过优化的共掺杂，并通过结构的孔隙率呈现较大的比表面积，当与未掺杂的TiO ₂的样品。我们的结果表明，可以探索多孔共掺杂的TiO ₂纳米结构的潜在电化学应用。