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首页> 外文期刊>Catalysis science & technology >MnFe2O4@nitrogen-doped reduced graphene oxide nanohybrid: an efficient bifunctional electrocatalyst for anodic hydrazine oxidation and cathodic oxygen reduction
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MnFe2O4@nitrogen-doped reduced graphene oxide nanohybrid: an efficient bifunctional electrocatalyst for anodic hydrazine oxidation and cathodic oxygen reduction

机译：MnFe2O4@nitrogen-doped降低石墨烯氧化物nanohybrid:一个有效的双官能electrocatalyst阳极氧化肼和阴极氧还原

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摘要

The direct hydrazine fuel cell (DHFC) emerges as a promising tool to produce electricity without any carbon emission. The electrocatalyst plays a role central to the performance of the DHFC. Thus, development of cost-effective bifunctional electrocatalysts remains a key to make this technology practically viable. Herein, we report a single-step hydrothermal synthesis route to couple MnFe2O4 nanoparticles (NPs) with nitrogen-doped reduced graphene oxide (h-MnFe2O4 NPs/N-rGO) and demonstrate its bifunctional role as an electrocatalyst for both anodic hydrazine electrooxidation and cathodic reduction of molecular oxygen. The as-synthesized h-MnFe2O4 NPs/N-rGO composite not only catalyzes hydrazine electrooxidation via a quasi-4-electron pathway (n = 3.94) with a small Tafel slope (106 mV decade~(-1)) but is also capable of reducing molecular oxygen through an efficient 4-electron pathway. The oxygen reduction performance of the present composite is found to be comparable to that of the state-of-the-art Pt/C catalyst. In addition, the bifunctional electrocatalytic behavior of the h-MnFe2O4 NPs/N-rGO composite is found to be superior to those of MnFe2O4 NPs/rGO, pristine MnFe2O4 NPs, N-rGO alone, and the physical mixture of MnFe2O4 NPs and N-rGO. The improved electrocatalytic efficiency of the h-MnFe2O4 NPs/N-rGO composite originates from the synergetic physicochemical properties of MnFe2O4 NPs and N-rGO, which facilitates analyte diffusion, reduces charge transfer resistance, and offers a greater number of active sites for the catalytic reactions.
机译：直接联氨燃料电池(DHFC)出现有前景的发电没有任何工具碳排放。中央DHFC的性能。发展具有成本效益的双功能让这个electrocatalysts仍然是一个关键实际可行的技术。一个单级的水热合成路线几个MnFe2O4纳米颗粒(NPs)石墨烯氧化物(h-MnFe2O4 nitrogen-doped减少NPs / N-rGO)和展示其双官能团的作用作为两个阳极electrocatalyst肼电氧化和阴极还原的分子氧。不仅NPs / N-rGO复合催化联氨摘要通过quasi-4-electron通路(n = 3.94)和一个小塔费尔斜率(106 mV十年~(1)),但也能够减少通过一个高效的4电分子氧途径。现在发现与组合最先进的Pt / C的催化剂。此外,双官能electrocatalytic行为的h-MnFe2O4 NPs / N-rGO复合发现是优于MnFe2O4 NPs / rGO,原始MnFe2O4 NPs N-rGO孤独,物理MnFe2O4 NPs和N-rGO的混合物。electrocatalytic效率的提高h-MnFe2O4 NPs / N-rGO复合来源于MnFe2O4协同作用的物理化学性质NPs N-rGO,促进分析物扩散,减少电荷转移电阻,并提供更多的活跃的站点催化反应。

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