纳米孔
光电流
材料科学
分解水
量子点
析氧
光致发光
电场
光电子学
电子转移
纳米技术
电荷(物理)
化学物理
碳纤维
表面电荷
表面状态
动力学
量子效率
工作职能
电子传输链
化学工程
耗尽区
氧气
电子
图层(电子)
光电导性
多孔性
光电化学
领域(数学)
作者
Bo Peng,Xiaoxuan Zhao,Chunmei Li,Duo Zhang,Nan Zhou,Yuting Zhou,Shoubing Ding,Zhimin Wu,Yuli Xiong
标识
DOI:10.1021/acsanm.5c03481
摘要
The sluggish kinetics of oxygen evolution is widely recognized as one of the major challenges in developing a BiVO4-based photoanode. To address this intrinsic limitation, we present an integrated photoanode composed of nanoporous BiVO4 decorated with 5 nm carbon quantum dots (CQDs). The CQDs function as an efficient hole transfer layer due to their lower surface potential, creating an outward interfacial built-in electric field with the higher surface potential of bulk BiVO4. This electric field is capable of driving photogenerated holes to the CQDs’ surface for efficient water oxidation. The CQDs-BiVO4 demonstrates an improved photocurrent of 2.7 mA cm–2 at 1.23 V vs RHE under simulated sunlight, which is approximately 3.0 times higher than that of pristine BiVO4. The nanoporous CQDs-BiVO4 also achieves an enhanced surface charge transfer efficiency of 45.8% and a shorter electron transport time of 0.23 ms at a flow rate of 300 W m–2. Time-resolved photoluminescence analysis reveals that a longer lifetime is achieved (τ1 = 3.7 ns and τ2 = 49.0 ns) for CQDs-BiVO4, confirming that the reduced electron–hole recombination is beneficial for bulk charge transfer.
科研通智能强力驱动
Strongly Powered by AbleSci AI