Herein, we use a facile one-step hydrothermal growth process to achieve hollow spheres assembled from Mn-doped Fe₂O₃ nanoparticles (NPs) coated by reduced graphene oxide (rGO) layers. This unique 3D nanostructure enables electrochemical reactions to occur easily and efficiently, increasing the active regions of redox reactions where remarkable electrochemical properties with specific capacity of 285 mAh g⁻¹ (5.7 mAh cm⁻²) at 1 A g⁻¹ (20 mA cm⁻²) with a high area loading of 20 mg cm⁻². Cycle performance of 83.4% at 1 A g⁻¹ over 1000 cycles is achieved, confirming high stability of the Mn-doped Fe₂O₃@rGO hollow sphere after the redox reaction. Even under high current density of 16 A g⁻¹, capacity retention of 64.4% is demonstrated, representing good rate capability. Furthermore, hybrid capacitor (HC) devices consisting of the as-prepared 3D Mn-doped Fe₂O₃@rGO as the anode electrode and NiAl-LDH nanosheets as the cathode electrode with an superior maximum energy density of 102.0 Wh kg⁻¹ at the power density of 1.1 kW kg⁻¹ were demonstrated and the energy density of 56.0 Wh kg⁻¹ remains at the power density of 10.1 kW kg⁻¹.

在本文中，我们使用一种简便的一步式水热生长工艺来实现空心球体，该空心球体是由掺杂有氧化石墨烯（rGO）层的Mn掺杂的Fe ₂ O ₃纳米颗粒（NP）组装而成。这种独特的3D纳米结构使电化学反应能够轻松高效地发生，从而增加了氧化还原反应的活性区域，在该区域具有显着的电化学性能，比容量为285 mAh g ^-1（5.7 mAh cm ^-2）在1 A g ^-1（20 mA cm）^-2）的高区域载荷为20 mg cm ^-2。在1000次循环中，在1 A g ^-1下达到83.4％的循环性能，证实了Mn掺杂的Fe ₂ O的高稳定性₃ @rGO空心球在氧化还原反应之后。即使在16 A g ^-1的高电流密度下，容量保持率仍达到64.4％，表现出良好的倍率性能。此外，由制备的3D Mn掺杂的Fe ₂ O ₃ @rGO作为阳极电极和NiAl-LDH纳米片作为阴极电极组成的混合电容器（HC）器件在20 ℃时的最大能量密度为102.0 Wh kg ^-1。的1.1千瓦公斤的功率密度^-1进行了论证和56.0瓦千克的能量密度^-1保持在10.1千瓦公斤的功率密度^-1。