Novel method of the direct synthesis of MnO₂ on multiwalled carbon nanotubes by thermal decomposition and oxidation of cyclopentadienylmanganese tricarbonyl precursor in supercritical CO₂ is proposed. The phase compostion is analysed using X-ray difraction, morphology is studied by means of transmission and scanning electron microscopy. Electrochemistry of the obtained composites in alkaline electrolyte is studied by means of cyclic voltammetry and the activity in oxygen reduction reaction (ORR) is analysed by means of rotating disc electrode technique. Varying precursor concentration during synthesis allows one to control oxide particle dimensions and specific surface area (SSA) of the oxide phase. The resulting composite materials demonstrated improved mass activity (up to 45 A g⁻¹ at 800 mV relative to RHE) in ORR.

提出了在超临界CO _{2 中}通过热分解和氧化环戊二烯基三羰基锰前驱体在多壁碳纳米管上直接合成MnO _{2 的}新方法。使用 X 射线衍射分析相组成，通过透射和扫描电子显微镜研究形貌。采用循环伏安法研究了所得复合材料在碱性电解液中的电化学性能，并采用转盘电极技术分析了氧还原反应（ORR）的活性。在合成过程中改变前体浓度可以控制氧化物颗粒尺寸和氧化物相的比表面积 (SSA)。所得复合材料表现出改善的质量活性（高达 45 A g^-1在 800 mV 时相对于 RHE) 在 ORR 中。