Petal-like CoMoO₄ Clusters Grown on Carbon Cloth as a Binder-Free Electrode for Supercapacitor Application

Abstract

The development of supercapacitors with a high energy density and power density is of great importance for the promotion of energy storage technology. In this study, we designed and prepared petal-like CoMoO 4 clusters combined with carbon cloth as an excellent self-standing and binder-free electrode for asymmetric supercapacitors. Due to the abundant electrochemical active sites, the promising electron conduction, and ion diffusion rate, the CoMoO 4 @carbon cloth (CoMoO 4 @CC) electrode exhibits an excellent electrochemical performance. The results show that the CoMoO 4 @CC material exhibits a high specific capacitance (664 F/g at a current density of 1 A/g) and an excellent cycle stability (capacitance remains at 84.0% after 1000 cycles). The assembled symmetrical supercapacitor has an energy density of 27 Wh/kg when the power density is 600 W/kg. Even at a higher power density (6022 W/kg), it still maintains a good energy density (18.4 Wh/kg).

Preparation of the N, P-Codoped Carbonized UiO-66 Nanocomposite and Its Application in Supercapacitors

“…To investigate electrochemical properties, N-C-UiO-66@AC and N/P-C-UiO-66@AC were tested as working electrodes in a three-electrode system in an electrolytic cell containing 6 M KOH. Figure A shows the Nyquist plots of the UiO-66-NH 2 , UiO-66-PO 3 , N-C-UiO-66@AC, and N/P-C-UiO-66@AC electrodes, where the intercept of the curves on the x -axis represents the equivalent series resistance ( R s ), the diameter of the high-frequency semicircle represents the charge transfer resistance ( R ct ), and the slope of the line in the low-frequency region is related to the ion diffusion process. − The R s values of N-C-UiO-66@AC and N/P-C-UiO-66@AC were evidently lower than those of UiO-66-NH 2 and UiO-66-PO 3 , indicating that the carbonization of MOF materials and the introduction of AC have significantly improved the conductivity of the materials. The R s values of UiO-66@AC and N/P-C-UiO-66@AC electrodes were 0.766 and 0.769 Ω, respectively, indicating that P doping did not significantly decrease the conductivity of the material.…”

“…This further confirms that doping both N and P atoms can improve the electrochemical performance of the electrode material, thereby increasing the storage capacity. Coulombic efficiency refers to the ratio of the discharge capacity and charge capacity and is an important metric to evaluate the reversibility of the SC . The Coulombic efficiencies of N-C-UiO-66@AC and N/P-C-UiO-66@AC are 95.9 and 58.7%, respectively.…”

“…Coulombic efficiency refers to the ratio of the discharge capacity and charge capacity and is an important metric to evaluate the reversibility of the SC. 25 The Coulombic efficiencies of N-C-UiO-66@AC and N/P-C-UiO-66@AC are 95.9 and 58.7%, respectively. The above results indicate that N-C-UiO-66@AC has better electrochemical reversibility than N/P-C-UiO-66@AC.…”

CuCoNi–S anchored CoMoO4/MoO3 forming core–shell structure for high-performance asymmetric supercapacitors

“…Transition metal oxides usually serve as electrode materials for pseudocapacitors, 16 such as ZnO, 17 MnO 2 , 18 MoO 3 , 19,20 Co 3 O 4 , 21 CoMoO 4 , 22,23 MnCo 2 O 4 , 24 ZnMoO 4 and NiMoO 4 . 25,26 In particular, MoO 3 and CoMoO 4 have attracted much attention, thanks to their low cost, environmental friendliness, ample resources in nature, multiple oxidation states and outstanding theoretical capacitance.…”

Performance comparison of distinct bismuth molybdate single phases for asymmetric supercapacitor applications

“…In this sense, a suitable device that stores energy with a high capacity and large power density with prolonged activity is required, which is capable of serving future generation energy storage applications such as hybrid and electric vehicles. [1][2][3] Due to the short cycle life, restricted power performance, and overheating difficulties with well-known storage devices such as batteries, we require an alternative technology to address these chal-lenges. 4 Electrochemical capacitors, known as supercapacitors, are rapidly emerging devices that store energy as they bridge the gap between electrolytic capacitors and batteries.…”