Hierarchical CuCo2O4 nanobelts as a supercapacitor electrode with high areal and specific capacitance

Facile synthesis of maguey-like CuCo2O4 nanowires with high areal capacitance for supercapacitors

“…The calculated value of the CuCo 2 O 4 unit cell dimension (a 0 ) for (311) plane was 8.12 Å, higher than Co 3 O 4 (8.083 Å) [28], which confirmed that the CuCo 2 O 4 was synthesized successfully. This result is due to that the Cu 2+ ion radius (0.73 Å) is larger than Co 3+ (0.65 Å ) [27,28]. Cu 2+ accumulation induces the increase of lattice volume in both the spinel octahedral structure and the octahedral site [21,26].…”

“…The total diffraction peaks of the XRD match well with the cubic CuCo 2 O 4 phase (JCPDS no.78-2177) [17]. The calculated value of the CuCo 2 O 4 unit cell dimension (a 0 ) for (311) plane was 8.12 Å, higher than Co 3 O 4 (8.083 Å) [28], which confirmed that the CuCo 2 O 4 was synthesized successfully. This result is due to that the Cu 2+ ion radius (0.73 Å) is larger than Co 3+ (0.65 Å ) [27,28].…”

“…Recently, CuCo 2 O 4 nanobelts were successfully synthesized and the areal capacitance of 2.42 Fcm -2 was obtained [28]. In these articles, a common approach to apply these CuCo 2 O 4 nanostructures as electrodes for supercapacitors is to mix them with polymeric adhesive and black pigment and press the mixture onto current collectors.…”

Facile synthesis of CoNi 2 S 4 /Co 9 S 8 composites as advanced electrode materials for supercapacitors

“…As a bridge of traditional electrostatic capacitors and rechargeable batteries, supercapacitors (also called electrochemical capacitors) have been considered as one of the most promising energy conversion and storage systems in virtue of their advantages of fast charge/discharge rate, long cycling lifetime, and ultrahigh power density [4][5][6]. It is believed that supercapacitors show huge promising applications in the field of electric vehicles, regenerative braking systems, uninterruptible power supplies and portable electronics [5,7].…”

Electrochemical assessment of Ca3Co4O9 nanofibres obtained by Solution Blow Spinning

“…3c shows the capacitance as a function of the scan rate. The capacitance decreases with increasing scan-rate, as a result of the ion-exchange mechanism process, where low scan-rates favour the intercalation of ions throughout the electrode structure, otherwise the ion intercalation process ends up being limited [17]. The highest areal capacitance of 24.8 mF/cm 2 at 10 mV/s is 1240 times higher than that of TiO 2 nanotubes (0.02 mF/cm 2 ) [22].…”