NIR-plasmon-enhanced Systems for Energy Conversion and Environmental Remediation
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doi: 10.1007/s40242-020-0342-5
Review
NIR-plasmon-enhanced Systems for Energy Conversion and Environmental Remediation WANG Wenke1,2,3, Sandra Elizabeth SAJI2, Siva KARUTUR3*, ZHENG Hong1, MENG Guodong1*, CHENG Yonghong1 and YIN Zongyou2* 1. Center of Nanomaterials for Renewable Energy(CNRE), State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, P. R. China; 2. Research School of Chemistry, Australian National University, ACT 2601, Australia; 3. Research School of Physics and Research School of Electrical, Energy and Materials Engineering, Australian National University, Canberra, ATC 2601, Australia Abstract The introduction of plasmons is an important method to solve the insufficient utilization of the full spectrum of solar energy by semiconductor catalysts. However, semiconductor catalysts combined with traditional noble metal plasmons(Au, Ag) can only extend the absorption spectrum to partially visible light. In order to further improve the photoenergy absorption efficiency of catalysts, they need to be able to effectively utilize near-infrared light, which has become a new research direction. Recent studies have shown that traditional noble metal plasmons can absorb a part of NIR through special morphology, size control and material composite. At the same time, gratifying achievements have been made in the application of plasmonic semiconductors with broad spectrum absorption in catalysis. This article reviews the principles of generating and regulating plasmonic effects in different catalytic systems. The applications of plasmon absorption of near-infrared light in energy conversion and environmental remediation have also been presented. Keywords Near-infrared; Plasmon; Energy conversion; Environmental remediation
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Introduction
With the increasing energy demand of human society and the awakening of awareness of environmental protection, people began to look for clean and environmentally friendly energy sources[1]. Solar energy has attracted widespread attention because of its simplicity, easy access, and environmental friendliness[2]. Thus, a strong interest in photocatalysis and photoelectrocatalysis has been generated in energy conversion, environmental remediation and other fields[3]. However, due to the limitation of the band gap energy, traditional semiconductors can only absorb and use the shorter wavelength part of sunlight, which renders the near-infrared(NIR) spectrum constituting 45% of the total solar energy, unusable. To solve this problem, the utilization of photosensitive dyes[4], upconversion materials[5], photothermal materials[6] and plasmonic materials for various applications has been proposed and studied. Among these materials, plasmonic materials are particularly concerned because of their tunable absorption wavelength, strong light-matter interplay and availability. The noble metal materials represented by gold are widely used[7]. However, the absorption range of traditional plasmonic noble met
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