Efficient hot carrier injection in plasmonic semiconductor heterojunction for artificial photosynthesis of ammonia.

IF 2.9 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Keming Wu, Qiang Li, Shuai Yue, Xiaoxia Bai, Xinfeng Liu, Zhenhuan Zhao
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引用次数: 0

Abstract

Plasmonic semiconductors are arising as potential photocatalysts for the artificial synthesis of green ammonia. However, plasmon excitation-generated hot carriers on a single nanoparticle are easily recombined, leading to low photoconversion efficiency, and energetic defects make plasmonic semiconductors subject to unexpected changes, limiting post-engineering. Here, we developed a plasmonic semiconductor p-n junction by in situ growing p-type Cu3BiS3 in n-type Bi2S3 nanorods by an ion exchange method. The formation of plasmonic semiconductor heterojunctions was verified through high-resolution transmission electron microscopy, Mott-Schottky tests, valence band spectroscopy, and X-ray diffraction (XRD). Additionally, the rapid transfer of hot carriers between the heterojunctions was investigated using transient absorption spectroscopy. The plasmonic p-n junction shows strong localized surface plasmon resonance absorption in the near-infrared range and delivers a 61 times enhancement of the ammonia production rate under full spectrum irradiation in pure water. It can achieve an apparent quantum efficiency of 0.45% at 400 nm and 0.16% at 1000 nm. In situ Fourier-transform infrared (FTIR) reveal that the plasmonic semiconductor heterojunction promotes the nitrogen chemisorption and activation. Using ultrafast transient absorption spectroscopy, we found that localized surface plasmon resonance (LSPR) induced hot carriers can be efficiently injected from plasmonic Cu3BiS3 to non-plasmonic Bi2S3, with sufficient energy to drive water oxidation. We further confirmed that photothermal effects have little contribution to the photocatalytic performance in the water-particle suspension system. The present study shows a potential strategy utilizing plasmonic semiconductors made of earth-abundant elements for green ammonia synthesis. .

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来源期刊
Nanotechnology
Nanotechnology 工程技术-材料科学:综合
CiteScore
7.10
自引率
5.70%
发文量
820
审稿时长
2.5 months
期刊介绍: The journal aims to publish papers at the forefront of nanoscale science and technology and especially those of an interdisciplinary nature. Here, nanotechnology is taken to include the ability to individually address, control, and modify structures, materials and devices with nanometre precision, and the synthesis of such structures into systems of micro- and macroscopic dimensions such as MEMS based devices. It encompasses the understanding of the fundamental physics, chemistry, biology and technology of nanometre-scale objects and how such objects can be used in the areas of computation, sensors, nanostructured materials and nano-biotechnology.
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