Rational nanostructured FeSe2 wrapped in nitrogen-doped carbon shell for high-rate capability and long cycling sodium-ion storage

FeSe2nanocrystalline aggregated microspheres with ultrahigh pseudocapacitive contribution for enhanced sodium-ion storage

“…It is obvious that FeSe 2 @NC-0.3 displayed better rate performances than FeSe 2 -0 nanoparticles, which may be ascribed to the N-doped carbon layer on the FeSe 2 nanoblocks that can enhance the conductivity of the composite and offer more active sites for the electrochemical reaction. 30,31,42…”

“…It is obvious that FeSe 2 @NC-0.3 displayed better rate performances than FeSe 2 -0 nanoparticles, which may be ascribed to the N-doped carbon layer on the FeSe 2 nanoblocks that can enhance the conductivity of the composite and offer more active sites for the electrochemical reaction. 30,31,42 The long cycling performance of the FeSe 2 @NC-0.3 was conducted at a current of 5.0 A g −1 after the activation of 5 cycles at low current density of 0.1 A g −1 . As shown in Fig.…”

“…21 Compared with pure carbon, nitrogen doped carbon (NC) gives rise to high electronic mobility and good sodium mobility due to optimization of the electronic structure. [30][31][32][33][34][35][36] A three-dimensional (3D) hierarchical FeSe 2 @NC composite prepared by calcining a mixture of Berlin green (FeFe(CN) 6 ) and selenium powder exhibited good rate performance and long cycling stability (396.7 mAh g −1 at 2.0 A g −1 after 1300 cycles). 35 Rod-like FeSe 2 coated with NC obtained through heating Prussian blue and selenium powder showed a capacity of 308 mAh g −1 over 10 000 loops at a high rate of 10.0 A g −1 .…”

A paradigm for systematic screening and evaluation of artificial solid-electrolyte interfaces for lithium metal anodes: a computational study of binary selenides

“…[25][26][27] Thus, tremendous efforts have been devoted to developing metallic-selenide based materials for highperformance energy storage devices. [28][29][30][31][32] However, there are scarce studies on the application of selenide materials in LMAs. In addition, due to the lack of systematic theoretical guidance, the experimental selection of selenides relies heavily on the trial-and-error experiences, 33 which leads to a limited understanding of the protection mechanism of selenides for lithium metal.…”

A nanowire-assembled Co3S4/Cu2S@carbon binary metal sulfide hybrid as a sodium-ion battery anode displaying high capacity and recoverable rate-performance

“…S3e (ESI†), peaks at 284.08, 285.08, and 287.88 eV are ascribed to CC, C–N, and CO, respectively. 19 Fitted peaks at 397.68, 399.08 and 399.88 eV verify pyridinic-N, pyrrolic-N and graphitic-N, 20 respectively (Fig. S3f, ESI†).…”