title: Zinc-air battery: understanding the structure and morphology changes of graphene-supported CoMn(2)O(4) bifunctional catalysts under practical rechargeable conditions.
abstract: Nitrogen-doped/undoped thermally reduced graphene oxide (N-rGO) decorated with CoMn2O4 (CMO) nanoparticles were synthesized using a simple one-step hydrothermal method. The activity and stability of this hybrid catalyst were evaluated by preparing air electrodes with both primary and rechargeable zinc-air batteries that consume ambient air. Further, we investigated the relationship between the physical properties and the electrochemical results for hybrid electrodes at various cycles using X-ray diffraction, scanning electron microscopy, galvanodynamic charge-discharging and electrochemical impedance spectroscopy. The structural, morphological and electrocatalytic performances confirm that CMO/N-rGO is a promising material for safe, reliable, and long-lasting air cathodes for both primary and rechargeable zinc-air batteries that consume air under ambient condition.
authors.affiliation: Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST) , Daegu 711-873, Republic of Korea.
authors.forename: Moni
authors.initials: M
authors.lastname: Prabu
authors.forename: Prakash
authors.initials: P
authors.lastname: Ramakrishnan
authors.forename: Hiroki
authors.initials: H
authors.lastname: Nara
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Momma
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Osaka
authors.forename: Sangaraju
authors.initials: S
authors.lastname: Shanmugam
keywords: ambient condition; bifunctional catalyst; structural stability; surface morphology; zinc−air battery