The present research work shows a simple method to synthesize 3D NiFe₂O₄ hollow spheres by a hydrothermal route and its application as catalyst for water splitting in an alkaline microfluidic system. The NiFe₂O₄ was developed by a simple mechanism from the urea hydrolysis reaction and later subjected to a hydrothermal process to carry out a single-step synthesis, obtaining novel 3D hollow nanospheres with doubles, triples and quadruples shells. 3D NiFe₂O₄ with large surface area and stability showed a catalytic activity for the oxygen evolution reaction (OER) comparable with the commercial material commonly employed IrO_2. The NiFe₂O₄-based material was used as an anode and cathode in a microfluidic water splitting device, where the H₂ production was 2.5 and 2.7 × 10⁻⁵ mg s⁻¹ for 3D NiFe₂O₄ hollow spheres and IrO₂Pt/C, respectively.

本研究工作表明了一种通过水热路线合成3D NiFe ₂ O ₄空心球的简单方法及其在碱性微流体系统中作为水分解催化剂的应用。NiFe ₂ O ₄是通过尿素水解反应的简单机理开发的，然后经过水热过程进行一步合成，从而获得了具有双壳，三壳和四壳的新型3D中空纳米球。3D的NiFe ₂ ö ₄具有大表面积和稳定性显示出对析氧反应（OER）与通常使用的IrO该商业材料相当的催化活性_2.所述的NiFe ₂O ₄基材料在微流水分离装置中用作阳极和阴极，其中3D NiFe ₂ O ₄空心球和IrO ₂ Pt / C的H ₂产生量分别为2.5和2.7×10 ^-5  mg s ^-1， 分别。