Single Step Grown NiFe Sponges as Efficient Water Splitting Electrocatalysts in Alkaline Medium,ChemistrySelect

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Single Step Grown NiFe Sponges as Efficient Water Splitting Electrocatalysts in Alkaline Medium
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-01-27 , DOI: 10.1002/slct.202000112
S. Thoufeeq ₁ , Pankaj Kumar Rastogi ₂ , Senoy Thomas ₁ , Anagandula Shravani ₃ , Tharangattu N. Narayanan ₃ , M. R. Anantharaman ₁

Affiliation

Catalysts for heterogeneous catalytic reactions, particularly for total water splitting, is receiving tremendous attention and sustainable fuel development is highly relied on the catalysts development, where both the material and its method of preparation are important. Here, bimetallic multi‐phasic catalysts containing nickel (Ni) and iron (Fe) are synthesized using a simple but reproducible polyol method, which results in to different sponges having control over their chemical stoichiometry. The macroporous sponges thus developed contain metallic Ni, NiO, and Fe₂O₃, where their proportionate content can be varied with initial precursor ratio. The NiFe15 so developed is having the best oxygen evolution performance in terms of overpotential, kinetics, and charge transfer properties, and it is found to be better than the benchmarked IrO₂ based catalysts. The hydrogen evolution from the other ratio, NiFe5, is found to be better than other Ni and Fe based samples, and it is found to be very close to the hydrogen evolution performance of platinum. An alkaline water electrolysis full cell is constructed, devoid of any precious metals but with NiFe5 and NiFe15, and the overall splitting potential for the benchmarked current density of 10 mAcm⁻² is found to be 1.62 V only, which is better or on par with the other singly/multi‐phasic systems reported so far. Hence the work presented here shows the possibilities of futuristic electrochemical technologies with viable catalysts, and a detailed study is presented.

中文翻译：

单步生长的镍铁海绵作为碱性介质中的高效水分解电催化剂

用于非均相催化反应的催化剂，特别是用于总水分解的催化剂，受到了极大的关注，可持续的燃料开发高度依赖于催化剂的开发，在此方面，其材料及其制备方法都很重要。在这里，使用简单但可重现的多元醇方法合成了包含镍（Ni）和铁（Fe）的双金属多相催化剂，这导致了不同的海绵可以控制其化学计量。这样开发的大孔海绵含有金属Ni，NiO和Fe ₂ O _3。，其比例含量可以随初始前体比率而变化。就超电势，动力学和电荷转移性质而言，如此开发的NiFe15具有最佳的氧气释放性能，并且发现它比基准的IrO ₂基催化剂更好。发现从其他比率NiFe5释放出的氢比其他基于Ni和Fe的样品更好，并且发现与铂的释放氢性能非常接近。构造了碱性水电解全电池，不含任何贵金属，但带有NiFe5和NiFe15，基准电流密度为10 mA·cm ^-2时的总劈裂电位只能找到1.62 V，这是更好的，或与迄今为止报道的其他单相/多相系统相当。因此，本文介绍的工作表明了使用可行催化剂的未来电化学技术的可能性，并进行了详细研究。

更新日期：2020-01-27

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