高质量Ni-Fe水滑石六方片晶的低温合成
Low-temperature synthesis of high quality Ni-Fe layered double hydroxides hexagonal platelets
摘要：
本文描述了在100 ℃的低温下用湿化学法合成高度结晶的六方片状Ni-Fe层状双氢氧化物（LDH）。用三乙醇胺（TEA）和尿素均匀沉淀法制备了粒径在0.5-1.5 μ m之间、厚度在15 - 20 nm之间的片状纳米粉体。通过对中间产物的分析，与以往报道不同的是，在室温下首先形成了一种介稳的羟基氧化铁和Ni-TEA络合物。随后，当混合物被加热到100 ℃并且由于尿素的热分解而导致pH升高时，Ni 2+和Fe 3+缓慢释放，然后重新结合，从而导致形成纯的、高度结晶的Ni-Fe LDH薄片。该材料在析氧反应（OER）中作为电催化剂显示出有希望的结果，提供0.36V的过电位值。
英文摘要：
This paper describes the wet-chemistry synthesis of highly crystalline hexagonal flakes of Ni-Fe layered double hydroxide (LDH) produced at temperature as low as 100 oC. The flakes with diameter in the range of 0.5-1.5 um and the thickness between 15 and 20 nm were obtained by homogeneous precipitation method with the use of triethanolamine (TEA) and urea. By analyzing the intermediate products, it is suggested that, differently from previous reports, a thermodynamically metastable iron oxyhydroxide and Ni-TEA complex are firstly formed at room temperature. Subsequently, when the mixture is heated to 100 oC and the pH increases due to the thermal decomposition of urea, Ni2+ and Fe3+ are slowly released and then recombine, thus leading to formation of pure, highly-crystalline Ni-Fe LDH flakes. This material showed promising results as an electrocatalyst in oxygen evolution reaction (OER) providing an overpotential value of 0.36 V.
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