Electrochemical performance of Bi2O3 supercapacitors improved by surface vacancy defects

A self-templating scheme for the synthesis of NiCo2Se4 and BiSe hollow microspheres for high-energy density asymmetric supercapacitors

“…The asymmetric supercapacitor achieves a maximum energy density of 76.73 W h kg −1 at a power density of 1.79 kW kg −1 , and the energy density maintains at 63.2 W h kg −1 even at high power density of 9.0 kW kg −1 . Furthermore, the energy densities are comparable or even superior to other previously reported studies in the literature such as CeO 2 /NiV-LDH//Bi 2 O 3 (62.5 W h kg −1 , 1.59 kW kg −1 ), 93 Ni/Co-MOF//Bi 2 O 3 (47 W h kg −1 , 1.125 kW kg −1 ), 94 CoNi 2 S 4 //Bi 2 O 3 (86.6 W h kg − .6 kW kg −1 ), 58 (Ni,Co)Se 2 //BiSe (34.4 W h kg −1 , 0.373 kW kg −1 and 25 W h kg −1 , 2.1 kW kg −1 ) 70 and NiCo 2 Se 4 //AC (25 W h kg −1 , 0.49 kW kg −1 and 11.7 W h kg −1 , 8.6 kW kg −1 ). 80 More importantly, the specific capacitance retains about 93.4% after 3000 cycles at a current density of 5 A g −1 (Fig.…”

Redox and conductive underwater adhesive: an innovative electrode material for convenient construction of flexible and stretchable supercapacitors

“…These results demonstrated that the charge storage process of the NA/HP 2 W 18 /Ag electrode followed a diffusion-controlled mechanism at a lower scan rate, while it followed a capacitive-controlled mechanism at a higher scan rate. 51,52 The current density increased with increasing scan rate, indicating good rate capability. 32 Furthermore, the shapes of the CV curves did not show significant changes at higher scan rates, suggesting that the silver powder actually provided a fast and efficient conductive pathway for electron transmission.…”

“…Detailed charge-storage kinetics can be obtained from the relation of peak current and scanning rate in CV curves, which is described by equation I = aν b , 51,52 where a and b are constants, I is the redox peak current (mA), and ν is the scan rate (mV s −1 ). The value of b defines the charge storage behaviour of the electrode.…”

Solvothermal preparation of spherical Bi2O3 nanoparticles uniformly distributed on Ti3C2Tx for enhanced capacitive performance

“…The shape of the two curves is signicantly different, which can be attributed to the pseudocapacitive characteristics of Bi 2 O 3 . 43,45 The GCD curves of TB0-TB40 obtained at a current density of 0.2 A g À1 are shown in Fig. 6(c).…”

“…À1 ), suitable potential window, low cost and non-toxicity 23. Recent studies have shown that Bi 2 O 3 can be used as an electrode material for supercapacitors.…”