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首页> 外文期刊>Applied Surface Science >Chemical activation of commercial CNTs with simultaneous surface deposition of manganese oxide nano flakes for the creation of CNTs-graphene supported oxygen reduction ternary composite catalysts applied in air fuel cell
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Chemical activation of commercial CNTs with simultaneous surface deposition of manganese oxide nano flakes for the creation of CNTs-graphene supported oxygen reduction ternary composite catalysts applied in air fuel cell

机译：商用CNT的化学活化以及同时形成的氧化锰纳米片的表面沉积，用于创建应用于空气燃料电池的CNTs-石墨烯负载的氧还原三元复合催化剂

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摘要

To elevate power performance is crucial for commercally potential metal air fuel cells. Non-precious metal oxide-based oxygen reduction catalytic electrode is much desirable. Rational combination with low-dimension nanomaterials are greatly expected as the supports. Herein, carbon nanotubes (CNTs)-graphene supported manganese oxides composite catalysts (CMnCs) were obtained through activating commercial CNTs, namely, immersing them in acidic KMnO4 solution at room condition. It avoided conventional hydrothermal process and template surfactants. CMnCs-based air cathodes were made via pilot manufacture technology and equipped in fuel cells. Through characterizations, CNTs was found structurally defective and their outer walls suffered cracking into graphene nano pieces during processing, which further enhanced oxygen reduction reaction (ORR). Nano sized manganese oxide flakes were simulataneously grown on the CNTs-graphene surfaces, identified as the manganite. The areal distribution was found closely related to the additive amount of KMnO4 with regard to CNTs, somewhat influencing catalytic performance. The ORR activities of these CMnCs exceeded raw CNTs and referred manganese catalysts under identical conditions, and also the CMnCs air fuel cells were capable of outputting similar to 15% more power at 100 mA/cm(2). This reseach provided an inspiring pilot evidence for updating air fuel cell power from economical carbon as well as industrialization. (C) 2018 Elsevier B.V. All rights reserved.
机译：对于具有商业潜力的金属空气燃料电池而言，提高功率性能至关重要。非常希望基于非贵金属氧化物的氧还原催化电极。与低维纳米材料的合理组合被期望作为支撑。在此，通过活化市售的CNT，即在室温下将其浸入酸性KMnO 4溶液中，获得了碳纳米管（CNTs）-石墨烯负载的锰氧化物复合催化剂（CMnCs）。它避免了常规的水热工艺和模板表面活性剂。基于CMnCs的空气阴极是通过中试制造技术制造的，并配备在燃料电池中。通过表征，发现碳纳米管在结构上存在缺陷，其外壁在加工过程中破裂成石墨烯纳米片，从而进一步增强了氧还原反应（ORR）。纳米尺寸的氧化锰薄片同时在CNTs-石墨烯表面上生长，被鉴定为锰矿。发现面积分布与KMnO4相对于CNT的添加量密切相关，在一定程度上影响催化性能。在相同条件下，这些CMnC的ORR活性超过了原始CNT和所指的锰催化剂，而且CMnC的空气燃料电池在100 mA / cm（2）时能够多输出15％的功率。这项研究为从经济碳以及工业化更新空气燃料电池发电提供了令人鼓舞的试验证据。 （C）2018 Elsevier B.V.保留所有权利。

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