Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

Abstract

Summary In this work, cerium was doped in various concentrations ranging from 1.0 to 7.0 at. % by means of a facile hydrothermal synthesis route with an intention to improve the capacitive properties of Co3O4. X‐ray powder diffraction (XRD), scanning electron microscopy coupled with energy dispersive X‐ray spectroscopy (EDX) and HRTEM were employed to study the structural characteristics, morphology, elemental constitution and d‐spacing of the synthesized material. The capacitive characteristics were analyzed through cyclic voltammetry (CV), galvanostatic charge‐discharge (GCD) test and electrochemical impedance spectroscopy (EIS). Materials characterizations revealed the formation of pristine and Ce‐doped Co3O4 nanoflakes, and their average size was in the range of 45 to 55 nm and possessing excellent elemental purity. The CV test showed that 5.0 at. % Ce‐doped Co3O4 nanoflakes deliver outstanding specific capacitance, that is, 1309.6 F/g and excellent cyclic stability of 90.86% after 2000 CV cycles at a scan rate 5 mV/s. The GCD test at 1‐10 A/g showed excellent rate capability, that is, 82.87% at high current density of 10 A/g. The EIS test revealed excellent electrical conductivity of the material. Experimental results suggest that Ce‐doped Co3O4 has an outstanding potential for use in energy storage devices.

Advanced Oxygen‐Vacancy Ce‐Doped MoO3 Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

“…The four symmetrical charge/discharge platforms correspond to the four pairs of redox peaks in CV curves, and the nonlinear characteristics of the GCD curves expose the typical faradic characteristics of OV‐MoO 3 and OV‐MoO 3 /Ce. [ 32 ] Figure 6d shows the specific capacitance of OV‐MoO 3 and OV‐MoO 3 /Ce at 5–20 A g –1 . The specific capacitance of OV‐MoO 3 /Ce = 30/1 is 1446.3 F g –1 at 5 A g –1 and 979 F g –1 at 20 A g –1 , respectively, greater than OV‐MoO 3 (1146.2 F g –1 and 515 F g –1 ), OV‐MoO 3 /Ce = 40/1 (1366.9 F g –1 and 817.5 F g –1 ), and OV‐MoO 3 /Ce = 20/1 (876.2 F g –1 and 470.0 F g –1 ).…”

Significantly improved conductivity of spinel Co3O4 porous nanowires partially substituted by Sn in tetrahedral sites for high-performance quasi-solid-state supercapacitors

“…Metal-ion doping is a suitable way to improve the electrochemical performance of active materials in supercapacitors by enhancing the electrical conductivity and increasing active sites. [21][22][23] Li et al synthesized Mn-doped Co 3 O 4 nanoneedles to enhance the electrochemical activity and conductivity of Co 3 O 4 by increasing active sites and facilitating fast charge transportation. 21 Aadil developed a mesoporous material of Ag-doped Co 3 O 4 nanosheets to increase the electrochemical properties through tuning the bandgap and improving the SSA by doping Ag into Co 3 O 4 .…”

“…22 Ali et al reported Ce doped Co 3 O 4 nanoakes to improve the electrical conductivity and specic capacitance by shortening the ion transportation path and increasing the active surface area. 23 In this work, we developed a facile strategy to synthesize hierarchical seedling-like porous nanowires of spinel Co 3 O 4 partially substituted by Sn on GF through a hydrothermal method and subsequent thermal annealing process. The unique CSO@GF structure showed improved electrochemical properties due to its signicantly enhanced electrical conductivity, which was investigated by density functional theory (DFT) calculations.…”

Boosted N2 Activation through 4f–2p–3d Orbital Hybridization for Efficient Nitrate Electrosynthesis

“…The Ce–Co 3 O 4 catalyst was synthesized via a facile hydrothermal method, as depicted in Figure a. [ 18,19 ] Detailed synthesis information can be found in the Experimental Section (Supporting Information). For comparison, the pure Co 3 O 4 was prepared using the same procedure without the addition of CeCl 3 ·6H 2 O. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques were employed to investigate the morphologies of both Ce–Co 3 O 4 and Co 3 O 4 .…”