The CQDs + Ni(OH)₂/BiVO₄ photoanode was fabricated by introducing CQDs with fluorescence and optical properties. The CQDs + Ni(OH)₂/BiVO₄ photoanode exhibited a low water oxidation onset potential (∼0.2 V vs. RHE) and a photocurrent density of 3.05 mA cm⁻² at a voltage of 1.23 V vs. RHE, which is about 2.5 times than that of the unmodified BiVO₄ electrode, and the charge injection efficiency is 65%. Surface dynamics test showed that CQDs + Ni(OH)₂/BiVO₄ photoanode had higher charge transfer rate and lower charge recombination rate than BiVO₄ electrode. As a cheap and stable catalyst for water oxidation, Ni(OH)₂ combined with CQDs can effectively improve the migration of photogenerated electrons and holes, thereby improving the photoelectrochemical (PEC) water oxidation activity of the photoanode.

通过引入具有荧光和光学特性的CQDs制备了CQDs + Ni(OH) ₂ /BiVO _4光阳极。CQDs + Ni(OH) ₂ /BiVO ₄光阳极表现出低水氧化起始电位（~0.2 V vs. RHE），在1.23 V vs. RHE的电压下，光电流密度为3.05 mA cm ^-2，约为是未修饰BiVO ₄电极的2.5倍，电荷注入效率为65%。表面动力学测试表明，CQDs + Ni(OH) ₂ /BiVO ₄光阳极比BiVO _{4具有更高的电荷转移率和更低的电荷复合率}电极。作为一种廉价且稳定的水氧化催化剂，Ni(OH) ₂与CQDs结合可以有效改善光生电子和空穴的迁移，从而提高光阳极的光电化学（PEC）水氧化活性。