Carbon-coating functionalized La₀.₆Sr₁.₄MnO₄₊δ layered perovskite oxide: enhanced catalytic activity for the oxygen reduction reaction
2014
Wang, Yarong | Yang, Zhibin | Lu, Fanliang | Jin, Chao | Wu, Jiao | Shen, Ming | Yang, Ruizhi | Chen, Fanglin
Efficient electrocatalysts for the oxygen reduction reaction (ORR) is a critical factor to influence the performance of lithium–oxygen batteries. In this study, La₀.₆Sr₁.₄MnO₄₊δ layered perovskite oxide as a highly active electrocatalyst for the ORR has been prepared, and a carbon-coating layer with thickness <5 nm has been successfully introduced to enhance the electronic conductivity of the as-prepared oxide. XRD, XPS, Raman, SEM and TEM measurements were carried out to characterize the crystalline structure and morphology of these samples. Rotating ring-disk electrode (RRDE) technique has been used to study catalytic activities of the as-prepared catalysts for the ORR in 0.1 M KOH media. RRDE results reveal that carbon-coated La₀.₆Sr₁.₄MnO₄₊δ exhibits better catalytic activity for the ORR. For the carbon-coated La₀.₆Sr₁.₄MnO₄₊δ, the ORR proceeds predominately via a direct four electron process, and a maximum cathodic current density of 6.70 mA cm⁻² at 2500 rpm has been obtained, which is close to that of commercial Pt/C electrocatalyst under the same testing conditions.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library
