Aerobic Recovered Carbon Fiber Support-Based MoO₂//MnO₂ Asymmetric Supercapacitor with a Widened Voltage Window

Abstract

Aerobic recovered carbon fibers (ARCFs) are chosen as functionalized support for both anodic MoO 2 and cathodic MnO 2 of asymmetric supercapacitors (ASCs). Based on the improved surface area, enhanced specific capacitance, and expanded potential window derived from O-containing radicals on the ARCF surface, the potentials of MoO 2 /ARCF anode and MnO 2 /ARCF cathode are respectively widened to −1.2 to 0 and 0−1.0 V, and thus the voltage range of ASC constructed by the MoO 2 /ARCF anode and MnO 2 /ARCF cathode is 2.2 V. In addition, this ASC exhibits a maximum energy density of 39.4 Wh kg −1 and power density of 5.5 kW kg −1 and owns 93.75% capacitance retention after 3000 cycles. This work provides a new strategy to develop a high-performance energy-storage device by choosing a functionalized support.

Nano Carbon/Vertical Graphene/MnO2 Nanosheets Composite Particles for High‐Performance Supercapacitors

“…The energy density is calculated as 54 Wh kg À1 at the power density of 181 W kg À1 , which outperforms the recently reported MnO 2 -based symmetric supercapacitors [62][63][64][65][66][67][68][69] and is even higher than the advanced asymmetric supercapacitors in literature. [70][71][72][73][74] Even at a high power density of 2.08 kW kg À1 , the device can still achieve an energy density of 8.829 Wh kg À1 . Two symmetric supercapacitors connected in parallel can drive a blue LED light successfully, indicating the practicability of the supercapacitors (Figure 7f ).…”

Construction of α-MnO2 on Carbon Fibers Modified with Carbon Nanotubes for Ultrafast Flexible Supercapacitors in Ionic Liquid Electrolytes with Wide Voltage Windows

“…Owing to the excellent properties of CNTs, the α-MCNTs//FCNTs-2V device retains 87.06% of its initial capacity, that is better than α-M//F-2V (49.46%) and most other devices shown in Table S3. According to Equations ( 2) and ( 3), the energy and power densities of α-MCNTs//FCNTs-2V are calculated and shown in Figure 8i and compared to other Mn-based supercapacitors in Figure 8i and Table S3 [ [49][50][51][52]. The total mass loading of α-MnO 2 on CNTs/CC is about 0.73 mg cm −2 and the discharging time at different current densities are used to calculate the energy and power densities.…”

“…Comparison of the electrochemical properties of MnO 2 -based supercapacitors. References [47,[49][50][51][52][53][54][55][56]62] are cited in the supplementary materials. Institutional Review Board Statement: Not applicable.…”

Green Strategy for the Synthesis of K+ Pre-inserted MnO2/rGO and Its Electrochemical Conversion to Na-MnO2/rGO for High-Performance Supercapacitors

“…Recently, many researchers have focused on synthesizing manganese oxide based materials for next-generation applications related to Li-ion batteries , and SCs − because of their useful electrochemical behavior, long cyclic life, low cost, and environmental compatibility. Manganese can produce many oxides such as MnO, MnO 2 , Mn 2 O 3 , Mn 3 O 4 , Mn 5 O 8 , and so forth. − Among them, the MnO 2 phase has been used as superior cathode materials in SCs.…”