3D Porous Compact 1D/2D Fe<sub>2</sub>O<sub>3</sub>/MXene Composite Aerogel Film Electrodes for All‐Solid‐State Supercapacitors
Yijia Luo, Yi Tang, Xiaoqing Bin, Chenji Xia, Wenxiu Que
Abstract
Abstract 2D MXene nanoflakes usually undergo serious restacking, that easily aggravates during the traditional vacuum‐assisted filtration process; and thus, hinders the electrochemical performance of the corresponding film electrodes. Herein, 3D porous compact 1D/2D Fe 2 O 3 /MXene aerogel film electrode with an enhanced electrochemical performance is fabricated by freeze‐drying assisted mechanical pressing. An introduction of 1D α‐Fe 2 O 3 nanorods can not only alleviate the restacking of 2D MXene but also provide additional pseudocapacitance for the composite film system. Thus, the resulting Fe 2 O 3 /MXene aerogel film electrode shows an enhanced specific capacitance of 182 F g −1 (691 mF cm −2 ) at a current density of 1 A g −1 in 3 m H 2 SO 4 electrolyte as well as with 81.74% capacitance retention after 10 000 charge–discharge cycles. Besides, the addition of 1D α‐Fe 2 O 3 nanorods has a significant contribution in the volumetric capacitance of the composite aerogel film (150 F cm −3 ), which is 2.68 times that of the pure MXene aerogel film (56 F cm −3 ). Moreover, the fabricated all‐solid‐state symmetric supercapacitor (SSSC) delivers a superior areal energy density of 3.61 µWh cm −2 at a power density of 119.04 µW cm −2 . This rapid‐forming 3D porous, binder‐free, and freestanding aerogel film provides a progressive strategy for the fabrication of MXene‐based electrode for supercapacitors.