Hydrogen generation by solar-driven water splitting is considered as a promising strategy to address energy crisis and environmental emission issues. Bismuth vanadate (BiVO₄) is a highly promising photoanode material for photoelectrocatalytic (PEC) water splitting, but its severe bulk and surface charge recombination, sluggish oxygen evolution reaction (OER) kinetics and narrow visible light harvesting are still bottlenecks. Here, an excellent CQDs/FeOOH/BiVO₄ photoanode was designed by co-modification of carbon quantum dots (CQDs) and ultrathin β-FeOOH layers (< 10 nm) on BiVO₄ to tackle the above issues. The CQDs/FeOOH/BiVO₄ shows dramatically enhanced photocurrent, which is 10.7 and 2.98 times higher than BiVO₄ and FeOOH/BiVO₄ at 0.8 V_RHE, with negatively shifted onset potential of 448 and 255 mV, respectively. The maximum incident photon-to-current conversion efficiency (IPCE) of CQDs/FeOOH/BiVO₄ is 6.7 and 1.86 times higher than that of BiVO₄ and FeOOH/BiVO₄, respectively. Additionally, the surface hole injection efficiency (η_surface) of CQDs/FeOOH/BiVO₄ is 7.1 and 2.1 times higher than that of BiVO₄ and FeOOH/BiVO₄ at 0.8 V_RHE, respectively. The results can be attributed to three effects: (I) Synergetic catalysis of CQDs and FeOOH sharply improves the OER kinetics due to the introduction of high-density oxygen vacancies (O_v); (II) The CQDs/BiVO₄ heterojunction efficiently suppresses the bulk charge recombination; (III) CQDs significantly boost the light harvesting both in the ultraviolet and visible regions.

通过太阳能驱动的水分解产生氢被认为是解决能源危机和环境排放问题的有前途的战略。钒酸铋（BiVO ₄）是用于光电子催化（PEC）分解水的极有前途的光阳极材料，但是其严重的本体和表面电荷重组，缓慢的氧气析出反应（OER）动力学和狭窄的可见光收集仍然是瓶颈。这里，一个优秀CQDs /的FeOOH / BiVO ₄光电阳极的设计是由碳量子点（CQDs）和BiVO超薄β-的FeOOH层（<10纳米）的共同变形例₄，以解决上述问题。CQDs / FeOOH / BiVO ₄显示出显着增强的光电流，是BiVO _4的10.7和2.98倍FeOH / BiVO ₄和FeOOH / BiVO ₄在0.8 V _RHE时，其开始电位分别为448和255 mV负移。CQDs的最大入射光子-电流转换效率（IPCE）/的FeOOH / BiVO ₄是6.7和比BiVO高1.86倍₄和针铁矿/ BiVO ₄分别。另外，表面的空穴注入效率（η_表面CQDs的）/的FeOOH / BiVO ₄是7.1，比BiVO的2.1倍更高₄和针铁矿/ BiVO ₄为0.8V _RHE， 分别。结果可归因于三个效应：（I）由于引入了高密度氧空位（O _v），CQD和FeOOH的协同催化作用显着改善了OER动力学；（II）CQDs / BiVO ₄异质结有效地抑制了体电荷的复合；（III）CQD显着促进了紫外线和可见光区域的光收集。