Abstract
A three dimensional (3D) carbon quantum dots (CQDs) decorated {001}TiO2/Ti photoelectrode was prepared by constructing the CQDs on the surface of {001} TiO2, which were grown in-situ on Ti-mesh structure, providing the nearly 100% exposed active {001} facets. The 3D CQDs-{001}TiO2/Ti shows high PEC oxidation activity towards the MO and BPA under visible light radiation, while the relevant removal ratios are 94.8% for BPA in 1 h and 93.6% for MO in 2 h, respectively. The enhanced PEC activity of CQDs-{001}TiO2/Ti is mainly attributed to the three improved factors (ηabs, ηsep and ηinj), which is analyzed deeply. The existence of CQDs not only improve the ηabs since its superior up-conversion performance, but also promote the higher ηsep due to enhanced hole-electron pairs’ separation. The highly exposed {001} facets are favorable for oxidation reactions to provide the increased ηinj.
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