摘要： Electrocatalysts for the oxygen reduction reaction (ORR) are of pivotal importance in various fuel cells and metal-air batteries. In this study, we report a facile synthesis of one-dimensional (1D) CaMn 2 O 4 nanostructures and their applications as cheap and active electrocatalysts for the ORR. Marokite CaMn 2 O 4 nanorods with post-spinel phase were prepared by a solvothermal route at mild temperatures, using potassium manganese oxide hydrate and calcium nitrate as the precursors and ethanol as the solvent. The as-prepared nanorods adopted the orthorhombic structure and possessed diameters of 150-300 nm and lengths of 2-4 m, with preferentially exposed (023) planes on surfaces. In alkaline electrolytes, CaMn 2 O 4 nanorods exhibited considerable catalytic performance and enabled an apparent quasi-four-electron transfer in the ORR, as evidenced by rotating disk electrode and rotating ring-disk electrode studies. The determined Tafel slop and the chronoamperometry stability of CaMn 2 O 4 nanorod electrocatalysts were comparable to the counterpart Pt nanoparticles supported on carbon. Post-spinel CaMn 2 O 4 nanorods, synthesized from a solvothermal route, exhibits considerable electrocatalytic activities toward quasi-four-electron oxygen reduction reaction. 出版日期： 2012-07-17 資源來源： Alma/SFX Local Collection 識別號： ISSN: 0959-9428 識別號： EISSN: 1364-5501 識別號： DOI: 10.1039/c2jm32564k
