The exploration of efficient and stable electrode materials is important for supercapacitors. Composite electrode materials are promising candidates for supercapacitors since single component materials cannot satisfy the dual needs of high energy density and power density. In this study, uniform strontium ferrite nanorods are grown on graphene by a facile surfactant assisted hydrothermal method. The resultant SrFe₁₂O₁₉ nanorods/graphene (SrFe₁₂O₁₉ NR/G) composites combine the merits of both SrFe₁₂O₁₉ and graphene, and the SrFe₁₂O₁₉ NR/G based supercapacitors exhibit specific capacitances of 681.2 and 450.9 F g^-1 at 1 and 20 A g^-1, respectively, and 95.5% of capacitance retention after 10,000 cycles at 1 A g^-1. Moreover, they exhibit outstanding energy density and power density characteristics (47.3 Wh kg^-1 at 500.9 W kg^-1 and 31.3 Wh kg^-1 at 10247.7 W kg^-1). In addition, the influence of component ratio on the electrochemical performances of SrFe₁₂O₁₉ NR/G composites is thoroughly studied. Finally, the energy storage behavior and mechanism of as-obtained SrFe₁₂O₁₉ NR/G composites are investigated to further understand their enhanced capacitive performances. This work not only provides a new supercapacitor electrode material, but also offers an idea that can be used for the construction of composite electrode materials.

探索高效稳定的电极材料对于超级电容器很重要。复合电极材料有望成为超级电容器的候选材料，因为单组分材料无法满足高能量密度和功率密度的双重需求。在这项研究中，通过简便的表面活性剂辅助水热法在石墨烯上生长均匀的锶铁氧体纳米棒。所得的SrFe ₁₂ O ₁₉纳米棒/石墨烯（SrFe ₁₂ O ₁₉ NR / G）复合材料结合了SrFe ₁₂ O ₁₉和石墨烯的优点，并且基于SrFe ₁₂ O ₁₉ NR / G的超级电容器的比电容为681.2和450.9 F g ^-1分别在1和20 A g ^-1下，以及在1 A g ^-1下10,000次循环后95.5％的电容保持率。此外，它们表现出出色的能量密度和功率密度的特性（47.3瓦千克^-1在500.9千克w ^ ^-1和31.3瓦千克^-1在10247.7W¯¯千克^-1）。此外，还研究了组分比对SrFe ₁₂ O ₁₉ NR / G复合材料电化学性能的影响。最后，得出了SrFe ₁₂ O _19的储能行为和机理对NR / G复合材料进行了研究，以进一步了解其增强的电容性能。这项工作不仅提供了一种新的超级电容器电极材料，而且提供了可用于复合电极材料构造的想法。