Controllable synthesis of Co/Ni basic carbonate composite via regulating Co/Ni ratio with super rate performance for asymmetric solid-state supercapacitor

Two-Dimensional Synergistic Interfacial Orientation on Tin Oxide-Reinforced Cobalt Carbonate Hydroxide Heterostructures for High-Performance Energy Storage

“…The best-performing SnO@CCH-8 electrode was coupled with AC electrodes (SnO@CCH-8//AC) to design the HSC. To avoid unbalanced charge accumulation, eq was used to calibrate the ideal mass ratio (m + :m – ) between the electrodes and the estimated mass ratio of 1:1.78 (thus, SnO@CCH-8 was 2.1 mg, so the predicted AC at 3.7 mg, and HSC mass maintained was 5.8 mg). , To optimize the voltage of HSC, a series of CV (Figure (b)) and GCD (Figure (c)) studies were performed at constants of 50 mV s –1 and 4 A g –1 with different voltage windows (1.3, 1.4, 1.5, 1.6, and 1.7 V), respectively. The voltage polarization was observed beyond 1.5 V as shown in CV and GCD plots.…”

“…To avoid unbalanced charge accumulation, eq 3 was used to calibrate the ideal mass ratio (m + :m − ) between the electrodes and the estimated mass ratio of 1:1.78 (thus, SnO@CCH-8 was 2.1 mg, so the predicted AC at 3.7 mg, and HSC mass maintained was 5.8 mg). 54,55 To optimize the voltage of HSC, a series of CV (Figure 5 As seen in Table 1, the maximum specific energy and power of SnO@CCH-8//AC device favorably demonstrate excellent energy storage capability and are relatively higher than previous reports on HSC values. In addition, Figure 5(h) shows the long-term cycle stability of the SnO@CCH-8//AC device as measured for 10,000 prolonged GCD cycles at a constant specific current density of 6 A g −1 .…”

Morphology-controlled synthesis of a NiCo-carbonate layered double hydroxide as an electrode material for solid-state asymmetric supercapacitors

“…[39][40][41] It is revealed that the best supercapacitor performance in NiCo-CH is primarily due to the optimized morphology and Ni : Co ratio. 42 Recently, Bhatt et al reported that the Ni : Co ratio leads to a change in the electronic properties of the material and thus the electrochemical performance. 43 In particular, oxygen vacancies are found as the main defects in NiCo-CH that are preferred at Ni sites.…”