Simple template fabrication of porous MnCo₂O₄hollow nanocages as high-performance cathode catalysts for rechargeable Li-O₂batteries

Abstract

Porous MnCo2O4 hollow nanocages have been fabricated via a simple template method using carbon spheres as a template. The hydrophilic surface of carbon spheres can adsorb Mn(2+) and Co(2+) ions simultaneously to form Mn,Co-adsorbed carbon spheres. The calcination of Mn,Co-adsorbed carbon spheres can result in porous hollow nanocages of MnCo2O4. The MnCo2O4 hollow nanocages are built by nanoscale MnCo2O4 crystals. Because of the unique porous hollow nanostructures, the resulting MnCo2O4/KB cathode shows an efficient electrocatalytic performance in LiTFSI/TEGDME electrolyte-based Li-O2 batteries. The MnCo2O4 hollow nanocages as the cathode catalysts can deliver better performance during the discharge/charge processes and good cycle stability compared with that of the pure KB carbon. The preliminary results manifest that porous MnCo2O4 hollow nanocages are promising high-performance cathode catalysts for Li-O2 batteries. This template technique is a simple, general, low-cost and controllable method and can be extended to prepare other transition metal oxide hollow nanostructures.

CuCr2O4@rGO Nanocomposites as High-Performance Cathode Catalyst for Rechargeable Lithium–Oxygen Batteries

“…The Co 3 O 4 @MnO 2 /Ni nanocomposite exhibited a small discharge/charge voltage gap of about 0.76 V and a stable cycle life [27]. With a cutoff capacity of 600 mAh g −1 at 400 mA g −1 , the Li–O 2 cell with MnCo 2 O 4 /KB catalyst can be cycled for more than 70 cycles [28]. These studies indicate that the round-trip efficiency and cycling capability can be effectively enhanced by the synergistic effect between the multicomponent and hierarchical structure.…”

Viable Synthesis of Porous MnCo2O4/Graphene Composite by Sonochemical Grafting: A High‐Rate‐Capable Oxygen Cathode for Li–O2 Batteries

“…Cao reported MnCo 2 O 4 anchored on hetero‐atom‐doped carbon as an electrocatalyst for Li–O 2 batteries . Several other reports suggest the active role of MnCo 2 O 4 as a cathode for Li–O 2 batteries . To further improve the cathode architecture, it is necessary to implicate the porous channels, which have direct access from the surface to the bulk, and get the maximum active surface area for the discharge product formation–decomposition.…”

“…[18] Several other reports suggest the active role of MnCo 2 O 4 as ac athode for Li-O 2 batteries. [19][20][21] To further improve the cathode architecture, it is necessary to implicate the porousc hannels, which have direct accessf rom the surface to the bulk, and get the maximum active surface area for the discharge product formation-decomposition. In this context,w e report porous nanosphereso fM nCo 2 O 4 /graphene (MCO/G) synthesized by as onochemicalm ethoda sacathode for Li-O 2 batteries.…”

Bimetallic organic frameworks derived CuNi/carbon nanocomposites as efficient electrocatalysts for oxygen reduction reaction

“…The major difficulty lies in the intrinsic catalytic activity, active sites and the poor mass transport of the potential materials [16]. Current approaches to improving such materials include the tuning of active sites and the construction of nanostructures [17][18][19]. Therefore, despite some progress, the development of alternatives to Pt-based materials as ORR catalysts remains a huge challenge.…”