Epitaxial growth of MnFe2O4 nanosheets arrays for supercapacitor

In situ synthesis of advantageously united copper stannate nanoparticles for a new high powered supercapacitor electrode

“…9f. The capacitance still remains about 92.4% after 3000 cycles, which suggests an excellent rate capability of the device which is high compared to previously reported transition metals stannates and other binary metal oxides supercapacitor devices such as Mn 2 SnO 4 //Mn 2 SnO 4 (75% after 1000 cycles), 12 Co 2 SnO 4 //AC (70.6% after 1000 cycles), 36 MFO-NSAs//AC (87.3% after 3000 cycles), 43 FeO 4 W/f-MWCNTs symmetric supercapacitor (78.54% after 10 000 cycles), 63 and PCNF//AC (92% after 800 cycles at 2 A g −1 ). 64…”

“…The area-normalized capacitance values (F cm −2 ) were determined based on eqn (5).where C p is the specific capacitance (F cm −2 ), I is the discharge current in ampere, t the discharge time in seconds responding to a potential difference of Δ V in volt, and a is the active geometrical area of the electrode in cm 2 . The energy density ( E ) and power density ( P ) of the electrodes were calculated from the following equations: 43 where E is the energy density (W h kg −1 ), C sp is the specific capacitance (F g −1 ), Δ V is the potential range (V), P is the power density (W kg −1 ) and Δ t is the discharge time (s).…”

“…Owing to several specific novelties and advantages, the unique nanoarray structures have been extensively studied as a potential electrode material for batteries, supercapacitors, catalysis, and so on. 42–45 Recently, among various nanostructures, researchers have focused on the alternative supercapacitor of non-toxic and less expensive metal oxide stannates nanoparticles. As per our knowledge the direct growth of Cu 2 SnO 4 nanoparticles on conductive substrates has not been reported at all; hence, in this study, for the first time, we present a convenient method for synthesizing homogeneous nanoparticles in a low-temperature reaction, with low expensive, ambient conditions, and high purity to engineer Cu 2 SnO 4 nanoparticles grown on desirable 3D Ni foam as an efficient binder-free electrode for high-performance electrochemical capacitors.…”

Phase- and Crystal Structure-Controlled Synthesis of Bi2O3, Fe2O3, and BiFeO3 Nanomaterials for Energy Storage Devices

“…Further, binary and ternary metal oxide-based PCs are ideal for high ED due to their ability to boost the electrochemical activity, high redox properties, and high electrical conductivity than pure metal oxides . Recently, researchers have identified metal ferrites (MFe 2 O 4 , Mn = Mn, Ni, Cu, and CO) as active materials for SC applications owing to their low toxicity, environmental friendliness, low cost, high surface area, and high electrochemical activity. − Among them, perovskite-structured (ABO 3 -type) electrode materials play a significant role in enhancing the electrochemical properties. In this regard, bismuth ferrite (BiFeO 3 )-based nanostructures with tuned crystal phase have been intensively attracted as an active electrode material for SC applications due to the synergetic effect of both Fe and Bi ions, which offers high redox reactions to the observed enhanced specific capacitance. − In particular, Jadhav et al demonstrated bismuth ferrite nanoflakes via the electrodeposition technique and showed a specific capacitance of 72.2 F/g at a current density of 1 A/g under a 2 M NaOH electrolyte .…”

CuCo2O4/NiCo-Metal–Organic Framework Nanoflake Arrays for High-Performance Supercapacitors

“…On the one hand, the large specific area of the nanostructure could guarantee adequate contact between the active material and electrolyte, making the utilization of active sites efficient . On the other hand, well-arranged arrays facilitate the fast transport of ions and electrons, which is favorable to the rate performance . Li and co-workers developed Cu-MOF nanowire arrays that achieve excellent specific capacitance and rate performance .…”