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Synergistic Effect of Plasmonic Gold Nanoparticles Decorated Carbon Nanotubes in Quantum Dots/TiO2 for Optoelectronic Devices
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-26 , DOI: 10.1002/advs.202001864
Gurpreet Singh Selopal 1, 2 , Mahyar Mohammadnezhad 2 , Lucas V Besteiro 1, 2 , Ozge Cavuslar 3 , Jiabin Liu 2 , Hui Zhang 2 , Fabiola Navarro-Pardo 1, 2 , Guiju Liu 4 , Maorong Wang 4 , Emek G Durmusoglu 3 , Havva Yagci Acar 3 , Shuhui Sun 2 , Haiguang Zhao 4 , Zhiming M Wang 1 , Federico Rosei 2
Affiliation  

Here, a facile approach to enhance the performance of solar‐driven photoelectrochemical (PEC) water splitting is described by means of the synergistic effects of a hybrid network of plasmonic Au nanoparticles (NPs) decorated on multiwalled carbon nanotubes (CNTs). The device based on TiO2–Au:CNTs hybrid network sensitized with colloidal CdSe/(CdSexS1−x)5/(CdS)1 core/alloyed shell quantum dots (QDs) yields a saturated photocurrent density of 16.10 ± 0.10 mA cm−2 [at 1.0 V vs reversible hydrogen electrode (RHE)] under 1 sun illumination (AM 1.5G, 100 mW cm−2), which is ≈26% higher than the control device. The in‐depth mechanism behind this significant improvement is revealed through a combined experimental and theoretical analysis for QDs/TiO2–Au:CNTs hybrid network and demonstrates the multifaceted impact of plasmonic Au NPs and CNTs: i) hot‐electron injection from Au NPs into CNTs and TiO2; ii) near‐field enhancement of the QDs absorption and carrier generation/separation processes by the plasmonic Au NPs; iii) enhanced photoinjected electron transport due to the highly directional pathways offered by CNTs. These results provide fundamental insights on the properties of QDs/TiO2–Au:CNTs hybrid network, and highlights the possibility to improve the performance of other solar technologies.

中文翻译:


等离激元金纳米颗粒装饰碳纳米管在量子点/TiO2光电器件中的协同效应



在这里,描述了一种通过装饰在多壁碳纳米管(CNT)上的等离子体金纳米粒子(NP)混合网络的协同效应来增强太阳能驱动光电化学(PEC)水分解性能的简便方法。基于 TiO 2 –Au:CNTs 混合网络的器件,采用胶体 CdSe/(CdSe x S 1− x ) 5 /(CdS) 1核/合金壳量子点 (QD) 敏化,产生 16.10 ± 0.10 mA 的饱和光电流密度cm -2 [相对于可逆氢电极(RHE)1.0 V]在1个太阳光照下(AM 1.5G,100 mW cm -2 ),比控制装置高约26%。通过对 QDs/TiO 2 –Au:CNTs 混合网络的联合实验和理论分析揭示了这一显着改进背后的深层机制,并证明了等离激元 Au NPs 和 CNTs 的多方面影响:i) Au NPs 的热电子注入转化为CNT和TiO 2 ; ii) 等离激元 Au NP 近场增强 QD 吸收和载流子生成/分离过程; iii) 由于碳纳米管提供的高度定向路径,增强了光注入电子传输。这些结果为 QDs/TiO 2 –Au:CNTs 混合网络的特性提供了基本见解,并强调了提高其他太阳能技术性能的可能性。
更新日期:2020-10-22
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