Facile one-step synthesized hierarchical Bi2O3/Bi12Mn12O44 composite as a long-term stable and high-performance electrode for hybrid supercapacitors

Facile microwave‐assisted synthesis of Ce‐doped Bi2O3 for efficient hybrid supercapacitors

“…This phenomenon may be due to the fact that the rate of electron transport is greater than the migration rate of OH − ions, leading to a lag in the surface-dominated electrochemical reactions. [32][33][34] At a scan rate of 2 mV s −1 , the specific capacity value of Ce-BT-40 was calculated to be 217 mA h g −1 , which exceeded that of BT (153 mAh g −1 ), Ce-BT-70 (199 mAh g −1 ), and Ce-BT-10 (167 mAh g −1 ). Meanwhile, the GCD curves of Ce-BT-40 were tested at different current densities, as depicted in Figure 3C.…”

“…Additionally, the anodic level peak shifted in the positive direction with increasing scan rate, while the opposite was true for the cathodic peak. This phenomenon may be due to the fact that the rate of electron transport is greater than the migration rate of OH − ions, leading to a lag in the surface‐dominated electrochemical reactions 32–34 . At a scan rate of 2 mV s −1 , the specific capacity value of Ce‐BT‐40 was calculated to be 217 mA h g −1 , which exceeded that of BT (153 mAh g −1 ), Ce‐BT‐70 (199 mAh g −1 ), and Ce‐BT‐10 (167 mAh g −1 ).…”

“…In addition, when the power density was increased to 10.5 kW kg −1 , the energy density can still be maintained at 26.1 Wh kg −1 . Most notably, as‐assembled HSC are still in the leading position compared to previously reported Bi 2 O 3 ‐based HSCs, such as Bi 2 O 3 //AC (1008.67 W kg −1 , 18.24 Wh kg −1 ), 41 Bi 2 O 3 @C//NiCo‐LDH (807 W kg −1 , 49 Wh kg −1 ), 20 Mn‐Bi 2 O 3 //AC (750 W kg −1 , 49.4 Wh kg −1 ), 17 and h‐Bi 2 O 3 @C//Ni/Co‐MOF (1125 W kg −1 , 47 Wh kg −1 ), 42 NiCo 2 O 4 @Bi 2 O 3 @C//AC (800 W kg −1 , 24 Wh kg −1 ), 31 Bi 2 O 3 //CO 3 O 4 (1225 W kg −1 , 38.5 Wh kg −1 ), 43 and BBMO‐6//AC (1703.3 W kg −1 , 16.7 Wh kg −1 ) 34 . To further demonstrate the practicality of the HSCs we fabricated, the combination of the two HSCs in series effectively powers two red light‐emitting diodes simultaneously (Figure 5E).…”

“…Most notably, as-assembled HSC are still in the leading position compared to previously reported Bi 2 O 3 -based HSCs, such as Bi 2 O 3 //AC (1008.67 W kg −1 , 18.24 Wh kg −1 ), 41 Bi 2 O 3 @C// NiCo-LDH (807 W kg −1 , 49Whkg −1 ), 20 Mn-Bi 2 O 3 //AC (750 W kg −1 , 49.4 Wh kg −1 ), 17 and h-Bi 2 O 3 @C//Ni/Co-MOF (1125 W kg −1 , 47Whkg −1 ), 42 NiCo 2 O 4 @Bi 2 O 3 @C//AC (800 W kg −1 , 24Wh kg −1 ), 31 Bi 2 O 3 //CO 3 O 4 (1225 W kg −1 , 38.5 Wh kg −1 ), 43 and BBMO-6//AC (1703.3 W kg −1 , 16.7 Wh kg −1 ). 34 To further demonstrate the practicality of the HSCs we fabricated, the combination of the two HSCs in series effectively powers two red light-emitting diodes simultaneously (Figure 5E). Additionally, the Ce-BT-40// CeNiCo-LDH HSC devices exhibited an impressive capacity retention of 91.4% and a Coulombic efficiency close to 100% after 3800 charge/discharge cycles.…”

Binder-free MoSe/MMSe composite and onion-derived activated carbon electrode materials for high-performance hybrid supercapacitors

“…The TEM results conrmed the presence of both phases. 32,34 Using inductively coupled plasma spectroscopy (ICP) analysis, the metal elemental ratio of the prepared MoSe/MMSe composite material was investigated as shown in Fig. S2 of the ESI.…”