In-situ synthesis of PdAg/g-C3N4 composite photocatalyst for highly efficient photocatalytic H-2 generation under visible light irradiation
In-situ synthesis of PdAg/g-C3N4 composite photocatalyst for highly efficient photocatalytic H-2 generation under visible light irradiation
复制标题
原位合成PdAg/g-C3N4复合光催化剂在可见光照射下高效光催化产H-2
DOI：
10.1016/j.ijhydene.2019.05.236
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发表时间：
2019
影响因子：
7.2
通讯作者：
Lu Guiwu
中科院分区：
文献类型：
--
作者：
Xiao Nan;Li Y;ong;Li Songsong;Li Xuli;Gao Yangqin;Ge Lei;Lu Guiwu
设计并采用原位化学还原法制备了新型PdAg双金属合金纳米颗粒修饰的石墨化碳氮化碳(g-C3N4)纳米片。通过优化PdAg合金纳米粒子的负载量，PdAg/g-C3N4复合光催化剂的光催化产氢速率为3.43mmolh−1g−1，在420 nm处的表观量子产率(AQY)为8.43%。此外，光致发光和光电化学实验结果表明，在g-C3N4上负载PdAg合金纳米粒子后，光生载流子(e-和h+)的分离效率更高。实验结果表明，PdAg与g-C3N4之间存在协同效应，可以显著促进杂化样品中的电荷转移光致载流子的形成。提出了复合光催化剂提高光催化性能的合理催化机理，并通过TRPL测试进行了验证，为新型高效催化体系的开发提供了指导。
Novel PdAg bimetallic alloy nanoparticle modified graphitic carbon nitride (g-C3N4) nanosheet was designed and prepared by an in situ chemical reduction procedure. By optimizing the loading content of the PdAg alloy NPs, the PdAg/g-C3N4composite photocatalyst showed a champion photocatalytic hydrogen generation rate of 3.43 mmol h−1g−1, and the apparent quantum yield (AQY) was determined to be 8.43% at 420 nm. Moreover, the photoluminescence and photoelectrochemical experimental results suggest that a higher separation efficiency of photo-induced charge carriers (e-and h+) was obtained after loading PdAg alloy NPs on g-C3N4. The experimental outcomes indicate that there is a synergistic effect formed between PdAg and g-C3N4, which could significantly promote the charge transfer photo-induced charge carriers in the hybrid sample. A reasonable catalytic mechanism for the enhanced photocatalytic performance of the composite photocatalyst was proposed and verified by TRPL measurement, which could be taken as a guidance for the development of novel high performance catalytic system.