Due to its earth abundant and excellent stability, metal oxide semiconductor attracts great attention in photoelectrochemical water splitting. However, its performance is restricted due to the high recombination rate of electron-hole pairs even modified with electrocatalysts. In this work, carbon quantum dots are studied as the charge bridge to boost the charge transfer kinetics of cobalt phosphate (Co-Pi)/Fe₂O₃ photoanode at the photoanode/electrocatalyst interface. Our results show that carbon quantum dots significantly improve the charge transfer and charge separation efficiency of Co-Pi/Fe₂O₃ photoanode. The photocurrent is substantially enhanced to 4.9 mA/cm² at 0.6 V (vs. Ag/AgCl) which is much higher than Co-Pi/Fe₂O₃ photoanode 3.7 mA/cm² in the same situation. These results provide a strategy to improve photoanode performance by facilitating the electrical contact at the photoanode/electrocatalyst interface with carbon quantum dots.

金属氧化物半导体由于其丰富的土质和极好的稳定性，在光电化学水分解中引起了极大的关注。然而，由于甚至用电催化剂改性的电子-空穴对的高重组率，其性能也受到限制。在这项工作中，研究了碳量子点作为电荷桥，以提高在光电阳极/电催化剂界面处的磷酸钴（Co-Pi）/ Fe ₂ O ₃光电阳极的电荷转移动力学。我们的结果表明，碳量子点显着提高了Co-Pi / Fe ₂ O ₃光电阳极的电荷转移和电荷分离效率。光电流显着提高到4.9 mA / cm ²在0.6 V（vs. Ag / AgCl）下，在相同情况下比Co-Pi / Fe ₂ O ₃光电阳极3.7 mA / cm ²高得多。这些结果提供了通过促进在光阳极/电催化剂界面处与碳量子点的电接触来改善光阳极性能的策略。