采用溶胶－凝胶及浸渍法制备得到NiO_x负载的新型光催化剂NiO_x-Fe /K₂La₂Ti₃O₁₀，研究了所制得的新型催化剂的光解水制氢活性，并利用扫描电镜、X 射线衍射、紫外－可见漫发射光谱、X 光电子能谱等技术对其进行表征和分析．结果表明: 制得的催化剂具有层状结构，对可见光有响应，NiO_x的负载使催化剂活性得到提高，反应6 h 累积产氢量达477．3 μmol /g; 相比于未负载的催化剂Fe /K₂La₂Ti₃O₁₀，NiO_x-Fe /K₂La₂Ti₃O₁₀的光吸收带边蓝移、直接禁带能隙变宽、电子－空穴对的氧化－还原能力增强; 化合物中La 是主要的电子给体，NiO_x的负载提供了更多的反应物吸附活性位，表面的NiO 形成自由电子捕获阱，促进H⁺ 在催化剂表面的还原，体相中被还原的金属Ni 成为光生电子捕获阱，并将光生电子及时向表面转移，减少电子和空穴的复合几率．

A novel kind of photocatalyst,namely NiO_x-loading Fe /K₂La₂Ti₃O₁₀,was prepared by means of sol-gelmethod and impregnation method,and the photocatalytic activity of the product for hydrogen generation from watersplitting was investigated. Then,the photocatalyst samples were characterized and analyzed by means of SEM,XRD,UV-vis DRS and XPS. The results show that the prepared catalysts with layered structure are sensitive to visiblelight,and that,after the loading of NiO_x,the photocatalytic activity increases to 477.3 μmol /g ( calculated asthe hydrogen production after 6 hours of accumulation) ,the band-edge absorption value has a blue shift,the directforbidden gap widens and the redox ability of electron-hole pairs improves. Moreover,as for the photoca-talyticmechanism,lanthanum in the compound serves as the main electron donor,the loading of NiO_x provides addedactive sites for reactant adsorbing,and the NiO groups on the surface produce captures of free electrons,thus promotingthe reduction of H⁺ on the catalyst surface.With this action,the reduced nickel in bulk produces capturesof photo-induced electrons and transfers them to the surface timely,thus decreasing the recombination ratio of electronsand holes.