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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Amorphous Ni59Nb40PtxM1-x (M = Ru, Sn) electrocatalysts for oxygen reduction reaction
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Amorphous Ni59Nb40PtxM1-x (M = Ru, Sn) electrocatalysts for oxygen reduction reaction

机译：用于氧还原反应的非晶态Ni59Nb40PtxM1-x（M = Ru，Sn）电催化剂

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摘要

The oxygen reduction reaction, ORR, on amorphous Ni59Nb40Pt1, Ni59Nb40Pt0.6Ru0.4 and Ni59Nb40Pt0.6Sn0.4 electrocatalysts was analyzed by electrochemical techniques such as cyclic voltammetry, CV; rotating disk, RDE, and ring-disk electrodes, RRDE, in a 0.5 M H2SO4 solution. The reduced amount of platinum and the incorporation of transition metals in the amorphous catalysts were found to have significant effect on the kinetic parameters of the cathodic reaction. The kinetics study (RRDE) performed on the amorphous catalysts showed a high activity towards the ORR, preferentially proceeding via multi-electron (4e(-)) charge transfer pathway toward water formation, with less than 2.8% H2O2 in the region of PEMFC applications. The performance on Ni59Nb40Pt1 was different, which may be related to changes in the electrode surface enrichment of one or two of the amorphous alloy constituents. The performance towards the cathodic reaction allows to envisage that incorporation of small amounts of Pt in the catalyst, may lead to the fabrication of good amorphous electrocatalytic materials with possible applications as cathode electrodes in polymer electrolyte fuel cells.
机译：用电化学技术如循环伏安法，CV分析无定形Ni59Nb40Pt1，Ni59Nb40Pt0.6Ru0.4和Ni59Nb40Pt0.6Sn0.4电催化剂上的氧还原反应ORR。在0.5 M H2SO4溶液中旋转盘RDE和环形盘电极RRDE。发现减少的铂量和过渡金属在无定形催化剂中的掺入对阴极反应的动力学参数具有显着影响。在无定形催化剂上进行的动力学研究（RRDE）显示出对ORR的高活性，优先通过多电子（4e（-））电荷转移途径进行水形成，在PEMFC应用领域中H2O2含量不到2.8％ 。 Ni59Nb40Pt1的性能不同，这可能与一种或两种非晶态合金成分在电极表面富集度的变化有关。对阴极反应的性能允许设想到催化剂中掺入少量的Pt可能会导致制造出良好的非晶态电催化材料，并有可能用作聚合物电解质燃料电池中的阴极电极。

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