Hydrothermal synthesis of CuCo₂O₄/CuO nanowire arrays and RGO/Fe₂O₃ composites for high-performance aqueous asymmetric supercapacitors

Abstract

Traditional asymmetric supercapacitors are severely restricted due to the low specific capacitance of carbon negative materials. The rational design of positive and negative electrodes that afford the asymmetric device with high performances is particularly important. In this paper, we fabricate a novel cost-effective and environmental-friendly aqueous asymmetric supercapacitor by using CuCo 2 O 4 /CuO nanowire arrays as positive electrode and RGO/Fe 2 O 3 composites as negative electrode. The assembled device exhibits a high energy density of 33.0 Wh kg -1 at a power density of 200 W kg -1 , and can still operate at a high power density of 8.0 KW kg -1 with an energy density of 9.1 Wh kg -1 . The current strategy will provide a fresh route for design and fabricate of novel asymmetric supercapacitors with both high energy density and high power density.

CuCo2S4 Nanosheets Coupled With Carbon Nanotube Heterostructures for Highly Efficient Capacitive Energy Storage

“…Furthermore, it still maintained an energy density as high as 29.48 Wh kg −1 at a high power density of 8.04 kW kg −1 . Compared to those of many reported Cu‐, Ni‐ and Co‐ based ACS, such as CoS//AC (29 Wh kg −1 at 800 kW kg −1 ), CuS//AC (17.7 Wh kg −1 at 504 W kg −1 ), Ni−Co sulfide//AC (25 Wh kg −1 at 447 W kg −1 ), CuCo 2 S 4 //AC (29 Wh kg −1 at 127 W kg −1 ) and CuCo 2 O 4 /CuO//RGO/Fe 2 O 3 (33 Wh kg −1 at 200 W kg −1 ) . The results strongly demonstrate that the CuCo 2 S 4 /CNTs electrode material has a promising potential in SCs.…”

Designing an Advanced Supercapattery Based on CuCo2S4@Ni−Mo−S Nanosheet Arrays

“…Recently, different spinel cobaltite materials have received significant attention in SC applications owing to their good electrochemical activity and conductivity than single metal oxides. Among them, CuCo 2 O 4 (CCO) is a promising spinel due to its nontoxicity and low cost …”

“…Among them, CuCo 2 O 4 (CCO) is a promising spinel due to its nontoxicity and low cost. [18][19][20] Lately, it has been demonstrated that metal sulfides (MSs) have superior performance than their metal oxide counterparts because they have higher conductivity. [21,22] Among which, CuCo 2 S 4 (CCS) has attracted great consideration as a favorable sulfospinel for SCs.…”

Polyaniline‐Acetylene black‐Copper cobaltite based ternary hybrid material with enhanced electrochemical properties and its use in supercapacitor electrodes

“…A peak at around 1295 cm -1 exhibits stretching vibration of C-N in quinoid ring indicating the formation of conducting polyaniline. 38,39 Minimal deviations in the spectroscopic peaks of PANI in composites could be due to its interaction with AB and CC, enhancing the number of delocalized charges in the backbone of the polymer. 35,36 C=NH + is present at around 2346 cm -1.…”

“…22,39 CC undergoes the following electrochemical reactions 38 : Co 3+ /Co 4+ and Cu 2+ /Cu 3+ transitions of copper cobaltite during oxidation reactions are observed at 0.3 V and 0.4 V, respectively.…”