A binary direct Z-scheme LaNiO3/g-C3N4 nanocomposite photocatalyst consisted with LaNiO3 nanoparticles and g-C3N4 nanosheets was successfully synthesized by means of mechanical mixing and solvothermal methods in order to improve the photocatalytic water splitting activity. The as-prepared materials were characterized by powder X-ray diffraction (XRD), Scanning Electron microscope (SEM), Transmission Electron microscope (TEM), X-ray photoelectron spectroscope (XPS), Fourier Transform Infrared Spectroscopy (FT-IR) and N2 adsorption–desorption experiments, respectively, demonstrating the formation of interfacial interaction and heterogeneous structure in LaNiO3/g-C3N4 nanocomposites. Under UV-light irradiation, the LaNiO3/g-C3N4 samples which without the addition of any noble metal as co-catalyst behaved enhanced photocatalytic water splitting activity compared with pure LaNiO3 and g-C3N4, owing to the Z-scheme charge carrier transfer pathway. Especially, the LaNiO3/70%g-C3N4 nanocomposite reach an optimal yield of up to 3392.50 µmol g−1 in 5 h and held a maximum H2 evolution rate of 678.5 µmol h−1 g−1 that was 5 times higher than that of pure LaNiO3.

中文翻译：

---

LaNiO ₃ / gC ₃ N ₄异质结纳米复合材料的高光催化效率和稳定性。

通过机械混合和溶剂热法成功地合成了由LaNiO3纳米粒子和g-C3N4纳米片组成的二元直接Z型LaNiO3 / g-C3N4纳米复合光催化剂，以提高光催化水分解活性。所制备的材料通过粉末X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线光电子光谱仪（XPS），傅立叶变换红外光谱仪（FT-IR）和N2吸附-解吸实验分别证明了LaNiO3 / g-C3N4纳米复合材料中界面相互作用的形成和非均质结构的形成。在紫外线照射下，与纯LaNiO3和g-C3N4相比，不添加任何贵金属作为助催化剂的LaNiO3 / g-C3N4样品表现出增强的光催化水分解活性，这归因于Z方案的电荷载流子转移途径。尤其是，LaNiO3 / 70％g-C3N4纳米复合材料在5小时内的最佳收率达到了3392.50 µmol g-1，并保持了最高H2析出速率678.5 µmol h-1 g-1，比​​其高出5倍。纯LaNiO3。