合成了Ni掺杂中孔TiO2光催化剂，其吸收光谱阈值红移至500mg，500℃焙烧后依然保持中孔结构。喇曼光谱证实，这种催化剂具有锐钛矿晶型。在Na.5/Na.SO。复合牺牲剂体系下，对Ni掺杂中孔TiO2和Ni掺杂颗粒TiO2两种催化剂的产氢活性进行了考察，发现前者比后者提高了近1倍。

The CdS/TiO2NTs composite was prepared by a simple two-step chemical solution routes to directly transfer trititanate nanotubes to TiO2NTs and simultaneously coupled with CdS nanoparticles. The results of XRD, TEM, Diffuse reflectance UV–Visible absorption spectra revealed that the CdS nanoparticles were homogeneously embedded on the surface of TiO2NTs and the absorption spectrum of TiO2NTs was extended to visible region. The activity of hydrogen production by photocatalytic water decomposition for the CdS/TiO2NTs composite was examined under visible light irradiation (λN400 nm) and the quantity of H2 evolution was ca. 1708 μL/g for 6h.

The hydrogen production from photocatalytic water decomposition is one of the best approaches that convert solar energy to hydrogen energy. At present, the hydrogen production from photocatalytic water decomposition has a low efficiency. In order to determine a valuable hydrogen production process from photocatalytic water decomposition in the aspect of energy conversion, the concept of critical conversion efficiency of light energy is proposed in this paper. Critical conversion efficiency of light energy is defined as the conversion efficiency of light energy when the hydrogen energy output is equal to an equivalent energy input of the system. The criterion introduced is that only if the conversion efficiency of light energy is greater than the critical one, an energy profit can be achieved in a system. A hypothetical system with 20,000 tons annual hydrogen production by using Na2S/Na2SO3 as the sacrificial reagent is analyzed and calculated in this paper to determine the critical conversion efficiency of light energy by means of energy balance, cumulative exergy balance, and emergy balance, respectively. The results show that the critical conversion efficiency of light energy determined by emergy balance is the most reasonable, which gives the figure around 15%.

对太阳能光催化分解水制氢体系的阈值能、太阳能转换效率以及太阳能转化成可储存的化学能效率进行了阐述；建立了一种利用已知量子产率的化学光量计测定光子数绝对值的实验方法，并使用该方法对太阳能光催化分解水制氢体系的能量转换效率及产氢的量子产率进行子计算。

以钛酸四丁酯和重铬酸铵为原料，采用溶胶凝胶法制备Cr2O3-TiO2复合型光催化剂!并利用浸渍法在Cr2O3-TiO2表面分别负载Fe、Mn、Mo过渡金属，制备了Fe-Cr2O3-TiO2、Mn-CrO3-TiO2、Mo-CrO3-TiO2三元复合型光催化剂。通过X射线衍射（XRD）、比表面分析（BET）和紫外可见吸收光谱（Uv-Vis）对催化剂进行了表征。XRD结果表明：TiO2为金红石结构；Cr2O3为绿铬矿结构。催化剂在紫外光和可见光条件下均具有光催化分解水产氢活性，紫外光条件下三元复合型光催化剂可以明显提高光催化产氢活性，其中Mo-CrO3-TiO2活性最高，而在可见光条件下，三元复合型光催化剂产氢活性略低于Cr2O3-TiO2。