Scalable novel lanthanide-ligand complex for robust flexible micro-supercapacitors

Eco-friendly synthesis of an α-Fe2O3/rGO nanocomposite and its application in high-performance asymmetric supercapacitors

“…In the Nyquist plot, the semicircle is associated with the charge transfer resistance ( R ct ) at the electrode/electrolyte interface and the initial point at the higher frequency region corresponds with the solution resistance ( R s ). 69 It can be clearly shown in the inset of Fig. 6(a), that there is a higher solution and charge-transfer resistance for α-Fe 2 O 3 NPs than for α-Fe 2 O 3 /rGO NC, summarized in Table S5 (ESI†), which reflects the suitability of α-Fe 2 O 3 /rGO NC as an electrode material for supercapacitors.…”

“…To deconvolute the exact contribution of capacitive and diffusive, the following equation has been employed: 69,70 i ( V ) = a 1 ν + a 2 ν 1/2 where i ( V ) defines the maximum current at a certain potential ( V ), a 1 and a 2 represent the constant, and a 1 ν is the surface capacitive and a 2 ν 1/2 is the diffusion-controlled contribution of the maximum value of current. a 1 and a 2 can be calculated by plotting at different potentials within the potential window, which is shown in Fig.…”

“…The loss of tangent plot was calculated from Fig. 6(a) employing the following relation: 69,73 where z ′′ and z ′ are the imaginary and real components of the impedance. Fig.…”

“…In both cases, the diffusion-controlled capacitance is higher at low scan rate which suggests that, at lower scan rates, sufficient time is provided to diffuse the ions at the electrode surface. 69,71 3.4.2. Electrochemical impedance spectroscopy (EIS).…”

“…The loss of tangent plot was calculated from Fig. 6(a) employing the following relation: 69,73 tanðfÞ ¼ z 00 z 0…”