Cobalt-nickel hybrid materials have multiple morphologies and multiple valence states and therefore have high electrochemical activity. Here we prepared Co-Ni precursor microspheres with hollow structure by homogeneous precipitation. This method is simple and rapid and requires neither the presence of a template compound nor high temperature/pressure conditions. Furthermore, the reaction only uses urea as a precipitation reactant; its decomposition products are water and ammonia, so the entire preparation process is green and environmentally friendly. Structural and compositional analyses revealed that the precursor has a micro-nano layered structure with a composition of [MCO₃]x·[M (OH)₂]y·nH₂O (M = Co, Ni; x,y,n = 1–5). Furthermore, the precursor has a good electrochemical activity for dopamine and a wide linear range (10 μM–0.5 mM). These results indicate that the precursor can be used for dopamine electrochemical sensing.

钴镍杂化材料具有多种形态和多种价态，因此具有较高的电化学活性。在这里，我们通过均匀沉淀制备了具有空心结构的Co-Ni前体微球。该方法简单而快速，既不需要模板化合物也不需要高温/高压条件。此外，该反应仅使用尿素作为沉淀反应物；反之亦然。它的分解产物是水和氨，因此整个制备过程都是绿色环保的。结构和组成分析表明，该前体具有微纳米层结构，其组成为[MCO ₃ ] x·[M（OH）₂ ] y·nH ₂ O（M = Co，Ni; x，y，n = 1-5）。此外，该前体对多巴胺具有良好的电化学活性，并且线性范围广（10 μM–0.5 mM）。这些结果表明该前体可用于多巴胺电化学传感。