Concentrating light technology is used to improve photoreduction of CO₂ to CH₄ reaction on semiconductor catalysts such as TiO₂. The catalysts were prepared by anodization method and characterized by XRD, SEM, XPS and photoillumiation. The results showed that the CH₄ yield rate could be raised from 0.70 μmol g⁻¹ h⁻¹ to 20.67 μmol g⁻¹ h⁻¹ under concentrating light, and it could be further increased to 28.49 μmol g⁻¹ h⁻¹ after pretreatment in the air. It is inferred that the concentrating light increases CO₂ conversion not only by heightening light intensity, but also by improving the surface properties of the catalyst.

聚光技术用于改善在半导体催化剂（如TiO _2）上将CO ₂还原为CH _4的光还原能力。通过阳极氧化法制备了催化剂，并通过XRD，SEM，XPS和光致发光进行了表征。结果表明，在聚光条件下，CH _4的得率可以从0.70μmolg ^-1  h ^-1提高到20.67μmolg ^-1  h ^-1，经过进一步的提高，可以进一步提高到28.49μmolg ^-1  h ^-1。在空气中进行预处理。可以推测，聚光使CO ₂增加 转化不仅通过提高光强度，而且还通过改善催化剂的表面性能。