The ternary MnFe2O4/graphene/polyaniline hybrid composite as negative electrode for supercapacitors

The impact of morphologies and electrolyte solutions on the supercapacitive behavior for Fe 2 O 3 and the charge storage mechanism

“…3d. It is worth noting that the inner specific capacitance is a diffusion controlled process, which dominates non-diffusion controlled capacitive behavior at lower scan rates and vice versa [29]. We can deduce from Fig.…”

“…When the value of b is 0.5, it is for intercalation of ions into the electrode or diffusion controlled process. When b=1, it is for capacitive process or non-diffusion controlled process [29]. From the results, we can see that the b values of Fe 2 O 3 -P have the least fluctuation and are the closest to 1, which means that the capacitive effect dominates in…”

“…Similarly, the intercalation effect makes a more contribution in the capacitance of Fe 2 O 3 -S [29,30]. Then the Trasatti plots [29,35,36] were used to identify their morphology-dependent capacitance.…”

“…Then the Trasatti plots [29,35,36] were used to identify their morphology-dependent capacitance. According to the analysis, the results and the corresponding theoretical specific capacitance of each electrode are given in Fig.…”

“…Therefore, various nanostructured, like nanoparticles, nanorods and nanoflowers, have been studied and exhibited shape-dependent relationship in electrochemical energy storage performance [24][25][26][27][28]. It was noted that the total charge storage of a supercapacitor electrode usually came from capacitive and intercalation contributions [29,30]. The combination of the two contributions which is mainly affected by the morphology, electrolyte [31,32] and pore structures of active materials co-determines the electrochemical performance of electrodes, thus, in turn influence the capacity and rate capability of electrodes.…”