Preparation and Electrochemical Properties of Mesoporous NiFe2O4/N-Doped Carbon Nanocomposite as an Anode for Lithium Ion Battery

Abstract

The NiFe 2 O 4 /nitrogen doped carbon composite was synthesized via calcination of NiFe-MOF in a N 2 atmosphere. Nitrogen-doped carbon not only improves the conductivity of the carbon-based material, but also provides pathway, allowing Li + diffusion rapidly during the charge and discharge processes. The electrochemical data reveal that NiFe 2 O 4 /nitrogen-doped carbon nanocomposite delivers a capacity as high as 760 mAh•g −1 at 0.2 C after 50 cycles, and show good rate performance by remaining a capacity of 600 mAh•g −1 even at 1 C. The excellent electrochemical characteristics might be contributed to the NiFe 2 O 4 ordered nanorod structure, well-marked porosity, and as well as the composition of nitrogen-doped carbon.

Solvothermal Synthesis, Photocatalytic and Electrochemical Properties of Flower-Like TiO₂ with Hierarchical Structures

“…With an increasing current density, the initial charge-discharge capacity of the flower-like TiO2 hierarchical structures gradually decreases, indicating that the increase in cell polarization is very limited [21]; thus, this titanium dioxide material is not suitable for high-power equipment. Compared with the commercial TiO2 P25, it can be seen that the flower-like TiO2 hierarchical structures have higher initial charge-discharge capacity than P25 (the initial chargedischarge capacity of the commercial TiO2 P25 at a rate of 0.2 C are 194.6/228.6 mAh/g [22]). The enhanced initial discharge capacity of the flower-like TiO2 hierarchical structures is due to the large BET surface area of the hierarchical structures and the nanoscale TiO2 particles in the hierarchical structures, which can effectively promote the intercalation and deintercalation of lithium ions on the electrode, shorten the diffusion path of lithium ions and increase the electron conduction rate.…”

NiFe2O4 Material on Carbon Paper as an Electrocatalyst for Alkaline Water Electrolysis Module

“…CP is mainly made of graphite, and it showed two primary peaks at 26.6 220), (311), (511), and (440) planes, respectively, of NiFe 2 O 4 (JCPDS card no. 86-2667) [87]. In CP/Ru electrocatalysts, the XRD spectra show the hexagonal structure of Ru.…”

“…The XRD spectra of CP/NiFe show five diffraction peaks at 17.8°, 30.1°, 35.6°, 58.1°, and 63.2° corresponding to the (111), (220), (311), (511), and (440) planes, respectively, of NiFe 2 O 4 (JCPDS card no. 86-2667) [ 87 ]. In CP/Ru electrocatalysts, the XRD spectra show the hexagonal structure of Ru.…”