Enhanced Photoactivity and Hydrogen Generation of LaFeO3 Photocathode by Plasmonic Silver Nanoparticle Incorporation
Enhanced Photoactivity and Hydrogen Generation of LaFeO3 Photocathode by Plasmonic Silver Nanoparticle Incorporation
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DOI：
10.1021/acsaem.8b00628
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发表时间：
2018-07-01
影响因子：
6.4
通讯作者：
Mallick, Tapas Kumar
中科院分区：
文献类型：
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作者：
Pawar, Govinder Singh;Elikkottil, Ameen;Mallick, Tapas Kumar
通过引入Ag纳米颗粒激发表面等离子体共振（SPR），制备了LaFeO 3 Ag（LFO-Ag）光电阴极，增强了光电化学（PEC）析氢的光捕获能力。采用时域有限差分法（FDTD）对Ag纳米颗粒进行了模拟，结果表明50-80 nm的尺寸对SPR增强效果最佳。采用一种新颖廉价的喷雾热分解方法制备了纳米结构的LFO薄膜，并通过简单的旋涂方法将Ag纳米颗粒均匀地分散在薄膜上。LFO-Ag光电阴极具有较强的光吸收能力和较高的电流密度，是未处理光电阴极的2倍。这随后导致增强的PEC析氢，与未处理的LFO相比，产生的氢气体积加倍。这种增强归因于强烈的SPR效应以及Ag纳米颗粒和纳米结构LFO光电阴极之间的协同作用。
A plasmonic LaFeO3 Ag (LFO-Ag) photocathode was synthesized by incorporating Ag nanoparticles to excite surface plasmon resonances (SPRs) for enhanced light harvesting to drive photoelectrochemical (PEC) hydrogen evolution. The Ag nanoparticles were modeled using finite difference time domain (FDTD) simulations, and the results show an optimal dimension of 50-80 nm for SPR enhancement. Nanostructured LFO films were prepared by a novel and inexpensive spray pyrolysis method, and the Ag nanoparticles were dispersed uniformly on to the films by simple spin coating method. The LFO-Ag photocathode exhibited strong light absorption capability and high current density, twice that of its untreated counterpart. This subsequently led to enhanced PEC hydrogen evolution, doubling the volume of hydrogen generated compared to untreated LFO. The enhancement is ascribed to the strong SPR effect and the synergy between the Ag nanoparticles and nanostructured LFO photocathode.