N,S co-doped V₃Nb₁₇O₅₀@C fibers used for lithium-ion storage

Abstract

Bimetallic oxides deliver high specific capacity in energy storage, but their disadvantages, such as poor electrical conductivity, low ion diffusion rate and interatomic instability, limit their application. In this work,...

Oxygen‐Deficient FeNbO4‐x In‐Situ Growth in Honey‐Derived N‐Doping Porous Carbon for Overall Water Splitting

“…According to EPR, Roman and XPS (N 1s) results, the oxygen defects are in FeNbO 4 and the N‐doping is within porous carbon. As for the O 1s spectrum (Figure 4d), the fitted three peaks, O−Fe (530.4 eV), oxygen vacancy (531.5 eV) and O−Nb (533.4 eV), [41] display oxygen vacancy successful generation, which is helpful for more defects production and electronic dislocations, so as to advance the conductivity and active site exposure. Besides, the Fe 2p spectra (Figure 4e) mainly fits with Fe 2+ (709.3 eV and 723.2 eV), Fe 3+ (711.3 eV and 726.0 eV) and satellite peaks (716.6 eV and 728.8 eV).…”

Porous biscuit-like nanoplate FeNb11O29−x@C for lithium-ion storage and oxygen evolution

“…3C), the three main peaks at 248.8 eV, 287.1 eV and 289.5 eV were assigned to the C-C, CvO and OvC-O bonds, respectively. 39 In addition, the high resolution O 1s spectrum (Fig. 3D) shows two characteristic peaks at 530.6 eV and 533.1 eV that were assigned to the Nb-O/Fe-O bond and O vacancies, [40][41][42] where the oxygen vacancies are from H 2 plasma etching.…”

“…11,12 Niobium based materials, thanks to their safe operating voltage (1.0 V-1.5 V vs. Li + /Li), and high theoretical reversible capacity and energy density, are regarded as one of the most promising electrode materials for LIB applications. 13,14 O 29 ) with open Wadsley-Roth shear structures has attracted more and more attention in energy storage. 15,16 In particular, FeNb 11 O 29 , with edges and angles of a shared type-ReO 3 octahedron arranged in monoclinic and rhombic phases, shows good potential in LIBs.…”