Controlled synthesis of anisotropic hollow ZnCo2O4 octahedrons for high-performance lithium storage

Co3O4 hollow nanospheres doped with ZnCo2O4 via thermal vapor mechanism for fast lithium storage

“…From the second CV cycle, only one pair of redox peaks, 0.95 V for cathodic and 2.2 V for anodic present in the voltammograms, signifying the conversion reaction between Co3O4 and Co as follow[49]: Co3O4 + 8Li + + 8e -↔ 3Co + 4Li2O (In comparison with the first cycle, the cathodic peaks of the subsequent cycles have slightly smaller current, while anodic peaks display similar current throughout, confirming the occurrence of an irreversible reaction in the first cycle by forming solid electrolyte interface (SEI). The cathodic peaks are still sharp with small fullwidth at half maximum, which is different from the broad peaks reported for Co3O4 but similar to the voltammograms of ZnCo2O4[50]. The broad cathodic peaks partially result from the formation of the SEI layer[13] which consumes a large amount of charges while the sharp peaks of CO/ZCO (3.5mmol, 12h, 2) imply a small loss of charge in SEI after the first cycle and this result is attributed to the mature SEI layer formed in the first cycle which can be due to the synergistic effect from the dopant, ZnCo2O4.…”

One‐Step Controllable Synthesis of Mesoporous MgCo2O4 Nanosheet Arrays with Ethanol on Nickel Foam as an Advanced Electrode Material for High‐Performance Supercapacitors

“…This may be caused by the different morphologies of MCN‐1and MCN‐2. Figure b shows the three‐dimensional atomic structure of the spinel MgCo 2 O 4 unit cell, which is a normal cubic spinel structure with Mg ions occupying tetrahedral sites, Co ions occupying octahedral sites, and isostructural with Co 3 O 4 structures …”

“…Figure 2b shows the three-dimensional atomics tructure of the spinel MgCo 2 O 4 unit cell, which is a normalc ubic spinels tructure with Mg ions occupying tetrahedral sites, Co ions occupying octahedral sites, and isostructural with Co 3 O 4 structures. [31,32] XPS was employed to obtain the information of the elemental composition and oxidations tate of the MgCo 2 O 4 nanosheet arrays that were scratched from Ni foam. Figure3as hows the full-scans pectra of the materials, whichm ainly containedf our core-levels peaks that were assigned to C1s( as reference), Mg 2p, Co 2p, and O1s.…”

Crystal-seeds induced construction of ZnO–ZnFe2O4 micro-cubic composites as excellent anode materials for lithium ion battery

“…4,5 Ternary ferrite oxide systems, owing to the synergetic effects of their complex chemical compositions and natural structure, have exhibited signicantly improved electrochemical performance as electrode materials for LIBs. [6][7][8][9] Among them, ZnFe 2 O 4 , as a more competitive electrode material for LIBs, has received tremendous attention owing to its low toxicity, high natural abundance, low lithiation voltage ($1.5 V), and high theoretical capacity ($1072 mA h g À1 ). [10][11][12] In particular, the combination of an alloying/dealloying mechanism and conversion reactions during the lithiation/delithiation process of ZnFe 2 O 4 can contribute to the extra capacity and improve its electrochemical performance.…”