Black Phosphorus Quantum Dots Modified CdS Nanowires with Efficient Charge Separation for Enhanced Photocatalytic H2 Evolution
Black Phosphorus Quantum Dots Modified CdS Nanowires with Efficient Charge Separation for Enhanced Photocatalytic H2 Evolution
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DOI：
10.1002/cctc.202001847
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发表时间：
2020-12
期刊：
影响因子：
4.5
通讯作者：
Fulai Liu;Zhuan Wang;Y. Weng;Rui Shi;Wangjing Ma;Yong Chen
中科院分区：
文献类型：
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作者：
Fulai Liu;Zhuan Wang;Y. Weng;Rui Shi;Wangjing Ma;Yong Chen
在复合光催化剂中构建具有强耦合相互作用的高质量界面对于有效的界面电荷转移是非常必要的。在此，我们通过简单的静电自组装方法制备了具有紧密界面接触的黑磷量子点/CdS（BPQDs/CdS）二元复合材料，以实现高效的光催化析氢。 3 wt% BPQDs/CdS 在乳酸水溶液中的优化产氢速率可达 9.9 mmol g−1 h−1，分别是原始 BPQDs 和 CdS 的 99 倍和 5.5 倍。得益于接触良好的 BPQD/CdS 复合材料中 CdS 和 BPQD 之间的强界面相互作用，可以实现有效的电荷分离，从而增强光催化析氢活性。值得注意的是，时间分辨瞬态吸收光谱明确证实了光生电子从 CdS 到 BPQD 的快速转移。
Constructing a high‐quality interface with strong coupling interaction is highly desirable in composite photocatalysts for the efficient interfacial charge transfer. Herein, we prepared black phosphorus quantum dots/CdS (BPQDs/CdS) binary composites with tight interfacial contact via a facile electrostatic self‐assembly approach for efficient photocatalytic H2 evolution. The optimized H2 evolution rate of 3 wt % BPQDs/CdS can reach up to 9.9 mmol g−1 h−1 in lactic acid aqueous solution, 99 and 5.5 times greater than that of pristine BPQDs and CdS, respectively. Benefiting from the strong interface interaction between CdS and BPQDs in well‐contacted BPQDs/CdS composites, efficient charge separation can be achieved, leading to enhanced photocatalytic H2 evolution activity. Notably, the rapid transfer of photogenerated electrons from CdS to BPQDs was unambiguously confirmed by time‐resolved transient absorption spectroscopy.