拧扣机电产氢研究
Study on the Cu2S Nanoflakes with LSPR for enhanced PEC hydrogen generation
研究生：任凯旭
指导教师：杜希文教授
崔兰副教授
天津大学材料科学与工程学院
二零一六年十一月
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摘要
目前能源危机是人类面临的亟待解决的关键性问题。而太阳能是可供人类利用的最丰富的可再生能源，每年投射到地面上的太阳福射能高达l.05xl018千瓦时。目前，太阳能最主要的利用方式为太阳能的光伏利用和光电解水利用。自从科学家发现TiO2可以用作光电解水的潜在材料以来，TiO2一致是大家研究的重点对象，但是TiO2作为一种宽禁带半导体只能吸收紫外光。本文以窄带隙Cu2S 纳米片阵列为基础，可控地调节材料表面缺陷和体缺陷，通过多种表征印证了不同缺陷的存在；通过表面缺陷提升了材料的表面动力学，改变载流子浓度引入红外波段的LSPR共振，通过电磁场增强提升了Cu2S材料应用于光电解水制氢的性能。 1、本文通过液相浸泡的方法在Cu片上沉积了致密的Cu2O种子层，后续生长了Cu2S纳米片阵列，摸索了最佳的种子层厚度和硫化时间。通过优化后的纳米片阵列结合力牢固，结晶性良好，有利于载流子的传输。
球墨铸铁铸造2、对Cu2S纳米片阵列进行不同退火处理，可以得到不同缺陷缺陷位置和含量的样品，并用多种表征予以证实来增强说服力。此外由缺陷引起的载流子浓度改变可控地调节了红外波段的吸收，并且阐释LSPR共振峰位与载流子浓度之间的关系，阐释了半导体LSPR的根源。
pwm转模拟电压3、利用得到的具有表面缺陷的LSPR样品提升了材料在全光谱和AM1.5G 下的性能，在全光谱照射下可以达到0.597mA cm-2，在AM1.5G下性能可以达到0.26mA cm-2。缺陷引起的LSPR成功增强了材
料的光吸收，通过发光和电磁场增强的拟合相互印证了光吸收集中在了材料表面，进而提升了材料内部的载流子分离效率，最终提升了光电产氢性能。
关键词：Cu2S NFAs；；表面缺陷；LSPR；局域表面等离子体共振能量转移电磁场增强
ABSTRACT
Recently, the energy crisis is the key problem to be solved urgently, solar energy is available as the most abundant renewable energy, illuminated to the ground each year, the sun blessing up to l.05xl018 kw h.At present, the most important use of solar energy is solar photovoltaic and photoelectrical water spliting. since the discovery of water photolysis on a TiO2 photoanode in the 1970s. TiO2 is the initial semiconductor photocatalyst investigated and nowadays it is still the most studied one due to its own advantages. However, TiO2is a type of wide bandgap semiconductor and it only adsorbs UV light. Based on the Cu2S nanoflakes array with narrow bandgap, try to control the surface defects and bulk defects, the existence of different defects is confirmed by various characterizations. The surface reaction dynamics could be improved through surface defects; and pull in the localized surface plasmon resonance, finally photoelectrical water splitting performance could be improved by electromagnetic field enhancement.
边沟滑模施工1.In this paper, the oxidation of Cu foil to a thin Cu2O seed-layer and the growth of Cu2S nanoflake arrays via a liquid-phase sulfuring method. The Cu2S nanflakes arrays were subsequently grown to explore the optimized seed layer thickness and sulfuring time. Through optimizing, Cu2S nanoflakes array exhibits good adhesion and good crystallinity, which is favorable for the charge carriers transportation.
2.Cu2S nanoflakes arrays were annealing in different conditions to adjust the position and content of defects, which can be confirmed by a variety of characterizations. Try to controlling the infrared absorption completely and find the internal correlation between the charge carrier concentration and the peak position of the LSPR.
3.Utilizing the obtained surface defects induced LSPR samples, the properties of the material both in full spectrum and AM 1.5 G were improved. The surface defects promoting surface dynamics, the LSPR successfully enhanced the intrinsic absorption, through the photoluminescence and electromagnetic field enhancement fitting confirming that light absorption focused on the material surface, thereby the charge carriers separation and transportation efficiency can be greatly improved, finally promoting the photoelectrical hydrogen production performance.
KEY WORDS：Cu2S NFAs; surface vacancies; LSPR; PIRET electromagnetic field enhancement
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