NiO-FeS纳米复合材料的电沉积与电催化水分解性能

采用电沉积法在镍网(NF)基底上原位合成了氧化镍/硫化铁(NiO-FeS@NF)纳米复合材料，用于提高电解水效率。采用扫描电镜(SEM)、透射电镜(TEM)、能量色散X射线谱(EDS)和X射线光电子能谱(XPS)等分析NiO-FeS的表面形貌和化学组分。结果表明:NiO-FeS呈明显的二维片状结构，主要由FeS和NiO组成，两者形成了有效的异质结。直接采用NiO-FeS@NF工作电极进行电催化析氧反应(OER)，可提升电催化析氧性能。二维片状结构能够提供较大的比表面积和较多的活性位点，NiO-FeS界面处的电子转移速度加快。该研究可为高效纳米催化剂的制备提供一条便利且廉价的途径。

The Electrodeposition of NiO-FeS Nanocomposites and Their Performance of Electrocatalytic Water Splitting

The electrodeposition technology was used to in situ synthesize NiO-FeS nanocomposites on nickel foam (NF) substrate to improve the efficiency of electrocatalytic water splitting. SEM, TEM, EDS and XPS characterizations were adopted to explore the surface morphology and chemical composition of the as-obtained materials. It was demonstrated that the nanocomposites mainly consisted of FeS and NiO with an obvious two-dimensional sheet-like structure and a well-defined heterojunction was formed between the two constituents. The NiO-FeS@NF nanocomposites were directly used as the working electrode for electrocatalytic oxygen evolution reactions (OER) to enhance the catalytic activity. The two-dimensional structure could provide a large surface area and abundant active sites, which facilitated the electron transfer process at the NiO-FeS interface. This study may offer a convenient and inexpensive access to the fabrication of efficient nanocatalysts.