Jump to main content
Jump to site search

Issue 10, 2017
Previous Article Next Article

Spinel cobalt–manganese oxide supported on non-oxidized carbon nanotubes as a highly efficient oxygen reduction/evolution electrocatalyst

Author affiliations

Abstract

We report an in situ preparation of ultrasmall Co–Mn–O spinel nanoparticles (4.4 nm) supported on non-oxidized carbon nanotubes (denoted as CMO@CNTs) as a bifunctional catalyst for oxygen reduction and evolution reactions (ORR/OER). The preparation process involves the oxidization of divalent metal ions under alkaline conditions and the decomposition of nitrates in aqueous solution containing dispersed non-oxidized CNTs. The synthesized CMO nanoparticles strongly couple with the non-oxidized CNTs, which facilitates electron transfer and improves the catalytic activity. Other composites such as CMO@reduced graphene oxide, CMO@Vulcan X-72R, CMO@oxidized CNTs, and a physical mixture of CMO and CNTs were also prepared for comparison. Remarkably, CMO@CNTs exhibit a half wave potential of 0.91 V in 1 M KOH and higher kinetic current and better catalytic durability than Pt/C. Moreover, CMO@CNTs afford an electrocatalytic OER current density of 10 mA cm−2 at a low potential of 1.5 V and a small Tafel slope of 81.1 mV dec−1. Furthermore, CMO@CNTs display lower discharge/charge overpotential and more stable voltage plateau on cycling than that of Pt/C when employed as a cathode material in rechargeable Zn–air cells. This work indicates that CMO@CNTs are a promising, cheap and efficient bifunctional ORR/OER electrocatalyst for rechargeable metal–air batteries.

Graphical abstract: Spinel cobalt–manganese oxide supported on non-oxidized carbon nanotubes as a highly efficient oxygen reduction/evolution electrocatalyst

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 Jun 2017, accepted on 26 Jul 2017 and first published on 16 Aug 2017


Article type: Research Article
DOI: 10.1039/C7QI00367F
Citation: Inorg. Chem. Front., 2017,4, 1628-1633
  •   Request permissions

    Spinel cobalt–manganese oxide supported on non-oxidized carbon nanotubes as a highly efficient oxygen reduction/evolution electrocatalyst

    T. Ma, C. Li, X. Chen, F. Cheng and J. Chen, Inorg. Chem. Front., 2017, 4, 1628
    DOI: 10.1039/C7QI00367F

Search articles by author

Spotlight

Advertisements