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Synergistically enhanced photocatalysis from plasmonics and a co-catalyst in Au@ZnO–Pd ternary core–shell nanostructures
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-10-13 00:00:00 , DOI: 10.1039/c7qi00586e Benxia Li 1, 2, 3, 4, 5 , Renshan Wang 1, 2, 3, 4, 5 , Xiankun Shao 5, 6, 7, 8 , Liangzhi Shao 5, 6, 7, 8 , Baoshan Zhang 5, 6, 7, 8
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-10-13 00:00:00 , DOI: 10.1039/c7qi00586e Benxia Li 1, 2, 3, 4, 5 , Renshan Wang 1, 2, 3, 4, 5 , Xiankun Shao 5, 6, 7, 8 , Liangzhi Shao 5, 6, 7, 8 , Baoshan Zhang 5, 6, 7, 8
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In this work, a new design of ternary core–shell nanostructures of Au@ZnO–Pd was demonstrated to realize the synergetic utilization of a plasmonic effect and an electron-trapping co-catalyst for enhanced photocatalytic performance. In the ternary hybrid nanostructures, ZnO provides photo-generated carriers with higher redox ability, under UV-visible light, and Au nanocrystals perform the plasmonic hot electron injection as well as the local electromagnetic field enhancement of ZnO photoexcitation. Meanwhile, the Pd NPs can efficiently trap the generated electrons to govern the directional separation of the charge carriers. The efficient charge carrier separation in the ternary hybrid nanostructures was confirmed by steady-state PL spectra, time-resolved PL decay spectra, and transient photocurrent responses. The photocatalytic activity of the Au@ZnO–Pd nanostructures was evaluated by photodegrading phenol and methylene blue, respectively, under simulated sunlight (λ = 360–780 nm), and the results showed that the Au@ZnO–Pd nanostructures gained a great enhancement of photocatalysis compared with ZnO, ZnO–Pd and Au@ZnO. Moreover, the effect of Pd loading content in the Au@ZnO–Pd nanostructures on the photocatalytic efficiency was studied within a certain range, indicating that the Au@ZnO–Pd photocatalyst with ∼1.8 wt% Pd loading exhibited the best photocatalytic activities for photodegrading both phenol and methylene blue. The generation and effect of active species in the photocatalytic process were investigated using ESR testing and radical scavenging experiments. As a consequence, the integration of the ternary Au@ZnO–Pd core–shell nanostructures could achieve collective effects to greatly increase the photocatalytic efficiency.
中文翻译：
Au @ ZnO-Pd三元核-壳纳米结构中等离子体和助催化剂协同增强的光催化作用
在这项工作中，Au @ ZnO-Pd的三元核-壳纳米结构的新设计被证明可以实现等离子体效应和电子俘获助催化剂的协同利用，从而增强光催化性能。在三元杂化纳米结构中，ZnO在紫外可见光下为光生载流子提供了更高的氧化还原能力，Au纳米晶体执行等离子体热电子注入以及ZnO光激发的局部电磁场增强。同时，Pd NPs可以有效地捕获所产生的电子，从而控制电荷载流子的方向分离。三元杂化纳米结构中有效的载流子分离已通过稳态PL光谱，时间分辨的PL衰减光谱和瞬态光电流响应得到了证实。λ = 360–780 nm），结果表明，与ZnO，ZnO–Pd和Au @ ZnO相比，Au @ ZnO–Pd纳米结构的光催化性能大大增强。此外，在一定范围内研究了Au @ ZnO–Pd纳米结构中Pd负载量对光催化效率的影响，表明Pd负载量约为1.8 wt％的Au @ ZnO–Pd光催化剂表现出最佳的光催化活性。酚蓝和亚甲基蓝。使用ESR测试和自由基清除实验研究了活性物质在光催化过程中的产生和作用。因此，三元Au @ ZnO-Pd核-壳纳米结构的集成可以实现集体效应，从而大大提高光催化效率。
更新日期：2017-11-03
中文翻译：
Au @ ZnO-Pd三元核-壳纳米结构中等离子体和助催化剂协同增强的光催化作用
在这项工作中，Au @ ZnO-Pd的三元核-壳纳米结构的新设计被证明可以实现等离子体效应和电子俘获助催化剂的协同利用，从而增强光催化性能。在三元杂化纳米结构中，ZnO在紫外可见光下为光生载流子提供了更高的氧化还原能力，Au纳米晶体执行等离子体热电子注入以及ZnO光激发的局部电磁场增强。同时，Pd NPs可以有效地捕获所产生的电子，从而控制电荷载流子的方向分离。三元杂化纳米结构中有效的载流子分离已通过稳态PL光谱，时间分辨的PL衰减光谱和瞬态光电流响应得到了证实。λ = 360–780 nm），结果表明，与ZnO，ZnO–Pd和Au @ ZnO相比，Au @ ZnO–Pd纳米结构的光催化性能大大增强。此外，在一定范围内研究了Au @ ZnO–Pd纳米结构中Pd负载量对光催化效率的影响，表明Pd负载量约为1.8 wt％的Au @ ZnO–Pd光催化剂表现出最佳的光催化活性。酚蓝和亚甲基蓝。使用ESR测试和自由基清除实验研究了活性物质在光催化过程中的产生和作用。因此，三元Au @ ZnO-Pd核-壳纳米结构的集成可以实现集体效应，从而大大提高光催化效率。
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