Recently, metal selenides have gathered considerable attention for use as electrode materials for supercapacitor applications because of their substantial theoretical capacities. However, sluggish ion transport and chemical or mechanical degradation of electrode materials during continuous operation severely hamper their electrochemical performance. Herein, we have assembled MnSe (∼10−12 nm) into a 3D Ti 3 C 2 T x /rGO aerogel scaffold with bimodal pore size distribution through a low temperature hydrothermal method, followed by freeze-drying. A 3D percolation network of as-prepared MnSe/Ti 3 C 2 T x /rGO aerogel (MnSe/TCGA) improved electrolyte penetration by providing multidimensional ion transmission channels. High intrinsic conductivity of Ti 3 C 2 T x in combination with rGO facilitated electronic transport during electrochemical activity. Cellular sieves of the MnSe/ TCGA aerogel scaffold effectively interlocked MnSe particles and thereby prevented pulverization and aggregation of active material. Consequently, a MnSe/TCGA electrode with a specific architecture exhibited a significant specific capacity of 225.4 mAh/g at 1 A/g and maximum initial Coulombic efficiency of 99.5%, which surpassed the values obtained for its counterparts (i.e., MnSe/GA and MnSe). Furthermore, MnSe/TCGA showed an excellent rate capability (158 mAh/g at 12 A/g) and a superb life span (92.1% over 5000 cycles). When examined through impedance studies, MnSe/TCGA revealed low series and charge transfer resistances (R s = 2.6 Ω and R CT = 5.2 Ω). Overall, as-obtained findings provide insight on constructing high performance 3D porous and hybrid microstructures to optimize electrochemical energy storage performance.