冷等离子体处理制备NiO/SrTiO_3及其光催化水分解制氢性能研究

Preparation of NiO/SrTiO_3 with Cold Plasma Treatment for Photocatalytic Water Splitting

利用辉光放电等离子体处理改进常规浸渍法制备了NiO/SrTiO3光催化剂.XRD、XPS和TEM分析证明,金属颗粒在载体表面的分散性得到极大提高,并在反应中具有很好的稳定性.XPS、热重和XRD分析表明,等离子体处理使浸渍的Ni(NO3)2在常温下分解为晶化度较低的NiO团簇,该团簇可能与载体具有较强的相互作用.在光催化反应中,高分散的金属可以促进电荷传递,并提供更多的表面活性位.对于水分解制氢和甲醇溶液转化制氢反应,该催化剂的活性分别是常规催化剂的1.3倍和1.8倍.

Glow discharge plasma was used to modify NiO/SrTiO3 photocatalyst prepared by impregnation method. According to XRD, XPS, and TEM characterizations, the metal dispersion and stability of catalyst were greatly improved. XPS, thermo-gravimetric, and XRD characterizations showed that impregnated Ni（NO3）2 was decomposed into amorphous NiO clusters at room temperature. These clusters may have a strong interaction with the support, contributing to the enhanced metal dispersion and stability. The high metal dispersion can improve the electron transfer from semiconductor to metal and provide more active sites. The photocatalytic activity for water splitting to hydrogen and methanol solution conversion to hydrogen is 1.3 and 1.8 times of that of conventional catalyst.