2017/09/19 by Sonia Jaśkaniec, Christopher Hobbs, Jaskaniec, Sonia +13
Materials Science · #Catalytic Processes in Materials Science #FOS: Physical sciences #Layered Double Hydroxides Synthesis and Applications #Materials Science (cond-mat.mtrl-sci) #Supercapacitor Materials and Fabrication
paper · pdf · doi:10.48550/arxiv.1709.06459
openalex publication_date 2017/09/19 · openalex created_date 2017/09/25 · openalex updated_date 2026/07/28
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.