Binder-free Co–Mn composite oxide for Li–air battery electrode

Abstract

Binder-free Co-Mn composite oxide was successfully deposited at low temperature on a woven substrate through a combination of electroless and electrolytic steps. The principle of the approach was illustrated with cobalt metal and a successful thin film metal oxide formation was supported by CV, XRD and XPS data. The viability of the binder-free Co-Mn oxide electrode was tested as a Li-air battery electrocatalyst and yielded an initial specific capacity of up to 2000 mA h g À1 and survived multiple charge-dischargerecharge cycles. The oxidation time in the electrolytic oxidation-step was found to affect the battery discharge period. In comparison to the conventional polymeric binder methods, the present binder-free method is potentially adaptable to a roll-roll continuous processing approach. Experimental Materials preparationThe thin lm Co-Mn composite oxide catalyst was prepared on a exible woven carbon substrate (Fuel Cell Earth, AvCarbele, 11 ohm cm electrical resistivity, 99.5% carbon content) which is rst

Binary Nickel–Cobalt Oxides Electrode Materials for High-Performance Supercapacitors: Influence of its Composition and Porous Nature

“…[14][15][16][17][18][19][20][21][22][23][24][25][26] Especially, if two transition metals are co-incorporated into the host layer, better capacity and cycling stability are possibly achieved in comparison with monometallic systems. [27][28][29] Meanwhile, to achieve a high energy density for SCs, the electrode materials should possess sufficient surface electroactive species and facilitate the transition of electrons for Faradaic redox reactions.…”

Solarthermie und CO2: Methanol aus der Wüste

“…Different methods have been developed to improve the distribution uniformity of the cathode materials. Among these methods, in situ growth of catalysts on carbon support provides a facile process to achieve a novel electrode nanostructure 38, 45. 90, 91 Dong’s group developed a α‐MnO 2 /graphene nanosheet (GN) catalysts with α‐MnO 2 nanorods grown directly on GNs 90.…”

“…As is known, conventional PVDF and PTFE are nonconductive, and the lack of facile transfer networks for electron/Li in the carbon cathode with the conventional binder would limit the capacity, rate capability, and cycle efficiency of the lithium–oxygen cells. Therefore, binder‐free air electrodes44, 45 and functional binders for air electrodes41 were developed.…”

Cobaltite oxide nanosheets anchored graphene nanocomposite as an efficient oxygen reduction reaction (ORR) catalyst for the application of lithium-air batteries

“…Although the aforementioned noble metals exhibited prompt ORR activities, the limitations such as lack of availability, high cost and M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 5 tedious scale up process limited their onsite applications. It has prompted research efforts toward non-precious metal and metal oxide ORR catalysts such as MnO 2 [14], TiO 2 [15], CoO [16], γ-MnOOH [17], Co-Mn [18], and MnCo 2 O 4 [19]. Among the non-precious metal oxide ORR catalysts, cobaltite oxides are well known for its high theoretical capacity and p-type semiconducting behavior [20].…”

“…However, the expansion/contraction of cobaltite oxide nanostructures and particles aggregation lead to poor rate capability, lack of capacity and poor cycling performances, which still remained great challenges [21,22] and the aforementioned issues can be overwhelmed by using unique nanostructures. Although, unique nanostructures may exhibit superior catalytic activities, the easier deposition of discharge products clogged the surface active sites, which degraded the Li-ion migration and overall Li-air battery performances [16][17][18].…”