Constructing Three-Dimensional Porous Carbon Framework Embedded with FeSe₂ Nanoparticles as an Anode Material for Rechargeable Batteries

Abstract

Metal selenides have caused widespread concern due to their high theoretical capacities and appropriate working potential; however, they suffer from large volume variation during cycling and low electrical conductivity, which limit their practical applications. In this article, a three-dimensional (3D) porous carbon framework embedded with homogeneous FeSe 2 nanoparticles (3D porous FeSe 2 /C composite) was synthesized by a facile calcined approach, following a selenized method without a template. As the uniformity of FeSe 2 nanoparticles and 3D porous structure are beneficial to accommodate volume stress upon cycling and shorten electrons/ions transport path, associated with carbon as a buffer matrix for increasing conductivity, the 3D porous FeSe 2 /C composite displays excellent electrochemical properties with high reversible capacities of 798.4 and 455.0 mA h g −1 for lithium-ion batteries and sodium-ion batteries, respectively, when the current density is 100 mA g −1 after 100 cycles. In addition, the as-prepared composite exhibits good cycling stability as compared to bare FeSe 2 nanoparticles. Therefore, the facile synthetic strategy in the current work provides a new perspective in constructing a high-performance anode.

Metal‐Organic‐Framework‐Derived FeSe2@Carbon Embedded into Nitrogen‐Doped Graphene Sheets with Binary Conductive Networks for Rechargeable Batteries

“…Several other fitting peaks originate from the formation of iron oxide by surface oxidation of FeSe 2 and satellite peaks . The peaks observed at 707.1 and 720.3 eV for FeSe 2 /C@NGS are attributed to metallic iron …”

“…[52][53][54][55] The peaks observed at 707.1 and 720.3 eV for FeSe 2 /C@NGS are attributed to metallic iron. [56] Figure 2(a) exhibits typical well-defined sphere shape with nanometer sizes for the MOFs. Interestingly, as shown in Figure 2(b), the FeSe 2 /C composites maintain the similar morphology to precursor without aggregation after the selenization process under high temperature.…”

Near‐Field Electrospinning Enabled Highly Sensitive and Anisotropic Strain Sensors

“…In the pursuit of a high gauge factor, researchers have explored various types of conductive materials, such as carbon‐based fillers, conductive polymers, and metal nanowires or nanoparticles. [ 4 ] Efforts have also been made to tune the microstructures of conductive fillers to extend the sensing range of the devices. [ 5 ] However, several issues remain and limit the performance of the strain sensors in practical application scenarios.…”

Rational Design of Core‐Shell Structured C@SnO2@CNTs Composite with Enhanced Lithium Storage Performance

“…[1,5,6] So far, many kinds of anode materials have been used in LIBs such as nanosized carbons, [7] alloys, [8,9] metal oxides, [10][11][12][13] metal sulfides [14][15][16][17][18] and metal selenides. [19][20][21][22] Among them, SnO 2 , which is well documented in several works, is regarded as a promising candidate for commercial graphite anode because of much higher capacity (1494 mAh g À 1 ), low working potential, chemical stability as well as nontoxicity. [23][24][25] This high capacity results from the first conversion reaction from SnO 2 to Sn, and followed alloying reaction, the process of which accompanies large volume expansion.…”