NiO基納米多孔薄膜的可控制備及其電致變色性能的研究
發(fā)布時(shí)間：2018-12-21 17:44
【摘要】：隨著世界人口的增加,環(huán)境污染和能源短缺已經(jīng)成為目前人類所面臨的最大挑戰(zhàn)。電致變色材料具有低耗、高效、環(huán)境友好和智能化等特點(diǎn),是一種能夠改變?nèi)祟惱锰柲芊绞降男滦椭悄懿牧�。由電致變色材料制成的智能窗可以通過調(diào)節(jié)控制光的透過率和熱輻射,更充分地利用陽光,有效控制建筑物內(nèi)部的能量交換,實(shí)現(xiàn)減少能耗,降低照明和溫控費(fèi)用的目的,在智能建筑、汽車和航空航天等領(lǐng)域具有無限的應(yīng)用前景。在眾多電致變色材料中,NiO由于變色效率高,光譜調(diào)節(jié)范圍大,資源豐富和價(jià)格低廉等特點(diǎn)而成為最受關(guān)注的陽極電致變色材料。然而,由于較低的變色速率和較差的循環(huán)穩(wěn)定性,NiO電致變色薄膜的商業(yè)化應(yīng)用受到了一定程度的限制。本文的宗旨即是通過摻雜和復(fù)合化設(shè)計(jì)加快電化學(xué)反應(yīng)動力學(xué)進(jìn)而提高薄膜的電致變色性能。本文采用單一或相結(jié)合的化學(xué)浴沉積和水熱合成法成功地在FTO導(dǎo)電玻璃基底上制備了納米多孔的Co摻雜NiO納米片陣列薄膜及SnO2@NiO核殼納米片陣列薄膜,并研究了其電致變色性能。通過一步化學(xué)浴沉積法在FTO基底上制備了具有減反射能力的Co摻雜NiO納米片陣列結(jié)構(gòu)薄膜。Co的摻雜顯著影響了化學(xué)浴沉積過程中NiO薄膜的生長,與未摻雜的NiO相比,適量Co(1%)摻雜的NiO薄膜展現(xiàn)出更為優(yōu)異的電致變色性能,例如更大的光譜調(diào)制范圍(88.3%,550nm處),更快的電致變色速度率(3.4s和5.4s),更高的著色效率(47.7 cm2 C-1),以及更好的循環(huán)穩(wěn)定性。電致變色性能的提高可以歸因于Co摻雜后較低的結(jié)晶度,統(tǒng)一傾斜的納米片陣列結(jié)構(gòu)以及較高的電導(dǎo)率。由此可見,適量的Co摻雜能夠促進(jìn)NiO基電致變色薄膜的商業(yè)化應(yīng)用。通過結(jié)合簡單高效的水熱法和化學(xué)浴沉積法在FTO導(dǎo)電基底上直接生長制備了SnO2@NiO核殼納米片陣列結(jié)構(gòu)薄膜。這種等級多孔的核殼結(jié)構(gòu)是由SnO2納米片支撐核和NiO多晶納米片外殼兩部分組成。這種SnO2@NiO薄膜呈現(xiàn)出突出的電致變色性能,包括大的光譜調(diào)制范圍(85.3%,550 nm處),快的變色速率(1.7s和2.4s),高的著色效率(43.8 cm2 C-1),良好的循環(huán)性能。值得注意的是,這種SnO2@NiO核殼納米片陣列薄膜展現(xiàn)出持久的記憶效應(yīng),在商業(yè)化應(yīng)用中這種記憶效應(yīng)有利于節(jié)約能耗。增強(qiáng)的電致變色性能可以歸功于其獨(dú)特的核殼結(jié)構(gòu),這種結(jié)構(gòu)可以在電化學(xué)反應(yīng)過程中調(diào)節(jié)應(yīng)力,提供大量的活性位點(diǎn)和快速的離子轉(zhuǎn)移擴(kuò)散通道。
[Abstract]:With the increase of world population, environmental pollution and energy shortage have become the greatest challenge to mankind. Electrochromic materials have the advantages of low consumption, high efficiency, environmental friendliness and intelligence. They are a new type of intelligent materials which can change the way people use solar energy. The intelligent window made of electrochromic material can make full use of sunlight by regulating the transmittance of light and heat radiation, effectively control the energy exchange inside the building, and achieve the purpose of reducing energy consumption and lighting and temperature control costs. In intelligent building, automobile, aerospace and other fields have unlimited application prospects. Among many electrochromic materials, NiO has become the most concerned anodic electrochromic material because of its high efficiency, wide spectrum adjustment range, rich resources and low price. However, the commercial applications of NiO electrochromic films are limited to some extent due to their low chromotropic rate and poor cyclic stability. The aim of this paper is to improve the electrochromic properties of the films by doping and composite design to accelerate the electrochemical reaction kinetics. In this paper, Nano-porous Co doped NiO nano-array films and SnO2@NiO core-shell nanocrystalline array films were successfully prepared on FTO conductive glass substrates by single or combined chemical bath deposition and hydrothermal synthesis. Its electrochromic properties were also studied. The antireflective Co doped NiO nanoscale array films were prepared on FTO substrate by one-step chemical bath deposition. The doping of Co significantly affected the growth of NiO films in the process of chemical bath deposition, compared with that of undoped NiO. Appropriate amount of Co (1%) doped NiO films exhibit better electrochromic properties, such as wider spectral modulation range (88.3Nm), faster electrochromic rate (3.4s and 5.4s), and higher electrochromic rate (3.4s and 5.4s). Higher coloring efficiency (47.7 cm2 C-1) and better cyclic stability. The improvement of electrochromic properties can be attributed to the low crystallinity of Co doping, the uniform tilted nanochip array structure and the high conductivity. It can be seen that appropriate Co doping can promote the commercial application of NiO based electrochromic films. SnO2@NiO core-shell nanoscale array films were prepared on FTO substrates by a simple and efficient hydrothermal method and chemical bath deposition method. The core shell structure is composed of SnO2 nanocrystalline supporting core and NiO polycrystalline nanocrystalline shell. The SnO2@NiO film exhibits outstanding electrochromic properties, including large spectral modulation range (85.3 nm), fast chromotropic rate (1.7 s and 2.4 s), and high coloring efficiency (43.8 cm2 C-1). Good cycling performance. It is worth noting that this SnO2@NiO core-shell nanoscale array film exhibits a lasting memory effect, which is beneficial to energy saving in commercial applications. The enhanced electrochromic properties can be attributed to its unique core-shell structure which can regulate stress during electrochemical reaction and provide a large number of active sites and fast ion transfer diffusion channels.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.2;O614.813
本文編號：2389242
[Abstract]:With the increase of world population, environmental pollution and energy shortage have become the greatest challenge to mankind. Electrochromic materials have the advantages of low consumption, high efficiency, environmental friendliness and intelligence. They are a new type of intelligent materials which can change the way people use solar energy. The intelligent window made of electrochromic material can make full use of sunlight by regulating the transmittance of light and heat radiation, effectively control the energy exchange inside the building, and achieve the purpose of reducing energy consumption and lighting and temperature control costs. In intelligent building, automobile, aerospace and other fields have unlimited application prospects. Among many electrochromic materials, NiO has become the most concerned anodic electrochromic material because of its high efficiency, wide spectrum adjustment range, rich resources and low price. However, the commercial applications of NiO electrochromic films are limited to some extent due to their low chromotropic rate and poor cyclic stability. The aim of this paper is to improve the electrochromic properties of the films by doping and composite design to accelerate the electrochemical reaction kinetics. In this paper, Nano-porous Co doped NiO nano-array films and SnO2@NiO core-shell nanocrystalline array films were successfully prepared on FTO conductive glass substrates by single or combined chemical bath deposition and hydrothermal synthesis. Its electrochromic properties were also studied. The antireflective Co doped NiO nanoscale array films were prepared on FTO substrate by one-step chemical bath deposition. The doping of Co significantly affected the growth of NiO films in the process of chemical bath deposition, compared with that of undoped NiO. Appropriate amount of Co (1%) doped NiO films exhibit better electrochromic properties, such as wider spectral modulation range (88.3Nm), faster electrochromic rate (3.4s and 5.4s), and higher electrochromic rate (3.4s and 5.4s). Higher coloring efficiency (47.7 cm2 C-1) and better cyclic stability. The improvement of electrochromic properties can be attributed to the low crystallinity of Co doping, the uniform tilted nanochip array structure and the high conductivity. It can be seen that appropriate Co doping can promote the commercial application of NiO based electrochromic films. SnO2@NiO core-shell nanoscale array films were prepared on FTO substrates by a simple and efficient hydrothermal method and chemical bath deposition method. The core shell structure is composed of SnO2 nanocrystalline supporting core and NiO polycrystalline nanocrystalline shell. The SnO2@NiO film exhibits outstanding electrochromic properties, including large spectral modulation range (85.3 nm), fast chromotropic rate (1.7 s and 2.4 s), and high coloring efficiency (43.8 cm2 C-1). Good cycling performance. It is worth noting that this SnO2@NiO core-shell nanoscale array film exhibits a lasting memory effect, which is beneficial to energy saving in commercial applications. The enhanced electrochromic properties can be attributed to its unique core-shell structure which can regulate stress during electrochemical reaction and provide a large number of active sites and fast ion transfer diffusion channels.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB383.2;O614.813
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 熊曹水,熊永紅,朱弘,張?jiān)：?劉玉龍;Investigation of Raman spectrum for nano-SnO_2[J];Science in China,Ser.A;1997年11期
，本文編號：2389242
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