Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeOxHy
Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeOxHy
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DOI：
10.1038/s41929-018-0162-x
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发表时间：
2018-11-01
期刊：
影响因子：
37.8
通讯作者：
Chorkendorff, I
中科院分区：
文献类型：
--
作者：
Roy, C.;Sebok, B.;Chorkendorff, I
NiFeOxHy是碱析氧最活跃的催化剂。因此，它们被广泛用于碱性电解槽。关于它们具有特别高的催化活性的原因，仍然存在一些悬而未决的问题。在这里，我们使用一个模型系统的质量选择的NiFe纳米粒子和同位素标记实验表明，在1 M KOH中的氧析出不通过晶格交换进行。我们通过在操作条件下进行的电化学-质谱法以及非原位进行的透射电子显微镜和低能离子散射光谱法来补充我们的活性测量。连同粒度的趋势，同位素结果表明，氧的演变是有限的近地表区域。使用颗粒的表面积，我们确定在0.3 V的过电位下的转换频率为6.2 +/- 1.6 s（-1），据我们所知，这是碱性溶液中氧析出的最高报告。
NiFeOxHy are the most active catalysts for oxygen evolution in a base. For this reason, they are used widely in alkaline electrolysers. Several open questions remain as to the reason for their exceptionally high catalytic activity. Here we use a model system of mass-selected NiFe nanoparticles and isotope labelling experiments to show that oxygen evolution in 1M KOH does not proceed via lattice exchange. We complement our activity measurements with electrochemistry-mass spectrometry, taken under operando conditions, and transmission electron microscopy and low-energy ion-scattering spectroscopy, taken ex situ. Together with the trends in particle size, the isotope results indicate that oxygen evolution is limited to the near-surface region. Using the surface area of the particles, we determined that the turnover frequency was 6.2 +/- 1.6 s(-1) at an overpotential of 0.3 V, which is, to the best of our knowledge, the highest reported for oxygen evolution in alkaline solution.