黄色视频不卡_午夜福利免费观看在线_亚洲国产精品999在线_欧美绝顶高潮抽搐喷水_久久精品成人免费网站_晚上一个人看的免费电影_国产又色又爽无遮挡免费看_成人国产av品久久久

每周分享：Shewanella-mediated Biosynthesis of Manganese Oxide Micro-/Nanocubes as Efficient Electrocatalysts for the Oxygen Reduction Reaction。

今天給大家分享的是2015年1月份 《ChemSusChem》上發(fā)表的一篇名為：Shewanella-mediated Biosynthesis of Manganese Oxide Micro-/Nanocubes as Efficient Electrocatalysts for the Oxygen Reduction Reaction。

文章摘要如下：

Developing efficient electrocatalysts for the oxygen reduction reaction (ORR) is critical for promoting the widespread application of fuel cells and metal–air batteries. Here, we develop a biological low-cost, ecofriendly method for the synthesis of Mn2O3 micro-/nanocubes by calcination of MnCO3 precursors in an oxygen atmosphere. Microcubic MnCO3 precursors with an edge length of 2.5?μm were fabricated by dissimilatory metal-reducing Shewanella loihica PV-4 in the presence of MnO4? as the sole electron acceptor under anaerobic conditions. After calcining the MnCO3 precursors at 500 and 700?°C, porous Mn2O3-500 and Mn2O3-700 also showed microcubic morphology, while their edge lengths decreased to 1.8?μm due to thermal decomposition. Moreover, the surfaces of the Mn2O3 microcubes were covered by granular nanoparticles with average diameters in the range of 18–202?nm, depending on the calcination temperatures. Electrochemical measurements demonstrated that the porous Mn2O3-500 micro-/nanocubes exhibit promising catalytic activity towards the ORR in an alkaline medium, which should be due to a synergistic effect of the overlapping molecular orbitals of oxygen/manganese and the hierarchically porous structures that are favorable for oxygen absorption. Moreover, these Mn2O3 micro-/nanocubes possess better stability than commercial Pt/C catalysts and methanol-tolerance property in alkaline solution. Thus the Shewanella-mediated biosynthesis method we provided here might be a new strategy for the preparation of various transition metal oxides as high-performance ORR electrocatalysts at low cost

該文章中材料表征采用的是美國麥克儀器ASAP 2460

詳情可參考下面鏈接：

http://onlinelibrary.wiley.com/doi/10.1002/cssc.201402759/full