CN113818064B - 一种可以实现高效光热转换的针叶状镍黑膜 - Google Patents
一种可以实现高效光热转换的针叶状镍黑膜 Download PDFInfo
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 66
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- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 14
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- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种可以实现高效光热转换的针叶状镍黑膜,涉及针叶状镍黑膜的制备及海水淡化应用。该针叶状镍黑膜以泡沫镍为基底,通过电化学方法在其表面生长一层具有光热转换作用的针叶状镍黑活性层。该膜的针叶状结构可以有效提高膜的光热转换效果,其吸收波长范围覆盖250‑2500nm,光热转换效率在85%以上,在海水淡化过程中蒸汽渗透率可以达到1334.375g/m2·h。
Description
技术领域
本发明属于光热转换领域,及其在海水淡化方面的应用。
背景技术
中国是一个缺水严重的国家。淡水资源总量为28000亿立方米,占全球水资源的6%,仅次于巴西、俄罗斯和加拿大,居世界第四位。但人均只有2200m3,仅为世界平均水平的1/4、美国的1/5,在世界上名列第121位,是全球13个人均水资源最贫乏的国家之一。水是人类最重要的资源之一,淡水资源的缺乏会给人类带来许多问题,例如影响人们的生理健康、影响科技与工业的发展、影响农作物的生长等。因此,解决淡水资源匮乏的问题迫在眉睫。
海水淡化和废水回收是缓解缺水问题的两种关键方法。然而,在水处理过程中需要大量的能量消耗。在各种能源利用形式中,太阳能的光热应用是直接又有效的方法。由于太阳能属于低品位热能,未来大力发展能够满足各种应用需求和具有竞争力的太阳能光热转换设备是至关重要的。将太阳能转化成热能的新兴技术,太阳能加热使光热材料附近的水蒸发,太阳能蒸汽的产生在各种应用中引起了越来越多的关注,包括海水淡化、废水处理、产生能源。
想要利用太阳能,就要以光热转换材料为媒介,在光照条件下,能够通过自身的光热转换机制将光能转换为热量。光热转换材料要利用太阳能,其前提条件是要能够对太阳光的辐射能量进行吸收,尤其是能够吸收可见光和近红外光的能量,因为太阳辐射能量最为集中的波长范围是0.23-4μm,在这个波段范围内占有约98%的总辐射能量。由于地球大气中的臭氧、水气和其他分子的强烈吸收,波长在250nm以下和2500nm以上的太阳辐射无法抵达地面,因此能够到达地球表面的太阳辐射波段主要包括:250-400nm的紫外光、400-700nm的可见光和700-2500nm的近红外光。相比于有机材料、石墨烯以及贵金属材料,诸如镍、铜等廉价金属具有成本低,光热转换效率高等优点。
发明内容
本发明的目的在于发明一种具有高效光热转换的针叶状镍黑膜涉及针叶状镍黑膜的结构及制备方法,旨在提高光热转换效率,提高其在界面盐水蒸发中的蒸汽渗透率。
本发明步骤是:
一种可以实现高效光热转换的叶状镍黑膜的制备方法,其特征在于具体步骤为:
(1)将一定量的电解质加入溶剂中,持续搅拌至充分溶解,形成电解液;
(2)将支撑载体接在阴极上,两块镍板分别接在阴极左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;
(3)打开外加电源,调整实验电压及实验时间以控制载体上镍黑的含量该针叶状镍黑的有效成分为Ni纳米粒子以及NiO·OH,其反应如下:
Ni+6NH3+2H2O→[Ni(NH3)6]2++2OH-+H2↑
Ni2++e-→Ni
Ni2++2OH-→Ni(OH)2
Ni(OH)2+OH-→NiO·OH+H2O
(4)将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时。
本发明采用单阴极双阳极电泳沉积法,制备简单,一次成膜;载体表面镀上的镍黑在等离子体共振效应作用下可实现光热转换作用,以增加其在海水淡化过程中的水蒸气渗透率而获得更多淡水。
附图说明
图1摘要附图。
图2膜制备实验装置示意图。
图3海水淡化实验装置示意图。
图4有效膜面积为16cm2的镍黑光热转换膜及对比例在1sun光照下的蒸汽时渗透率及膜表面平均温度。
图5膜表面平均温度的红外热像示意图。
具体实施方式
为了更好地说明本发明,下面以镍黑光热转换膜为例结合附图对本发明进行进一步说明。
实验前期准备:
1.镍黑光热转换膜的制备:
(1)将2.64g的硫酸铵加500ml去离子水中,在室温下持续搅拌至充分溶解,形成电解质溶液;
(2)将泡沫镍接在阴极上,两块镍板接分别接在泡沫镍左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;
(3)打开外加直流电源的开关,调整实验电压及实验时间以调整泡沫镍上镍黑的含量;
(4)将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时;
2.实验过程:
将上述制备的有效膜面积为16cm2的叶状镍黑光热转换膜置于装有浓度为30g/LNaCl溶液的蒸发杯上,采用光强度为1sun的模拟太阳光进行照射。称取蒸发杯的初始重量和结束重量,进行蒸汽渗透率的计算。
实施例1
将2.64g的硫酸铵加入500ml去离子水中,在室温下持续搅拌至充分溶解,形成电解质溶液;将泡沫镍接在阴极上,两块镍板接分别接在泡沫镍左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;打开外加直流电源,15V电压下电解5分钟;将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时。在1sun的光照下,膜表面平均温度为37.4℃,蒸汽渗透率为859.375g/m2·h。
实施例2
将2.64g的硫酸铵加入500ml去离子水中,在室温下持续搅拌至充分溶解,形成电解质溶液;将泡沫镍接在阴极上,两块镍板接分别接在泡沫镍左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;打开外加直流电源,15V电压下电解10分钟;将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时。在1sun的光照下,膜表面平均温度为45.3℃,蒸汽渗透率为993.75g/m2·h。
实施例3
将2.64g的硫酸铵加入500ml去离子水中,在室温下持续搅拌至充分溶解,形成电解质溶液;将泡沫镍接在阴极上,两块镍板接分别接在泡沫镍左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;打开外加直流电源,15V电压下电解15分钟;将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时。在1sun的光照下,膜表面平均温度为57.0℃,蒸汽渗透率为1331.25g/m2·h。
实施例4
将2.64g的硫酸铵加入500ml去离子水中,在室温下持续搅拌至充分溶解,形成电解质溶液;将泡沫镍接在阴极上,两块镍板接分别接在泡沫镍左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;打开外加直流电源,15V电压下电解20分钟;将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时。在1sun的光照下,膜表面平均温度为61.9℃,蒸汽渗透率为1334.375g/m2·h。
实施例5
将2.64g的硫酸铵加入500ml去离子水中,在室温下持续搅拌至充分溶解,形成电解质溶液;将泡沫镍接在阴极上,两块镍板接分别接在泡沫镍左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;打开外加直流电源,15V电压下电解25分钟;将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时。在1sun的光照下,膜表面平均温度为67.2℃,蒸汽渗透率为1234.375g/m2·h。
实施例6
将2.64g的硫酸铵加入500ml去离子水中,在室温下持续搅拌至充分溶解,形成电解质溶液;将泡沫镍接在阴极上,两块镍板接分别接在泡沫镍左右两侧的阳极上,将接好的电极调整好距离并放入电解液中;打开外加直流电源,15V电压下电解30分钟;将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时。在1sun的光照下,膜表面平均温度为68.4℃,蒸汽渗透率为1284.375g/m2·h。
对比例:
将泡沫镍装在浓度为30g/L NaCl溶液的蒸发杯上,采用光强度为1sun的模拟太阳光进行照射。膜表面平均温度为35.7℃,计算蒸汽渗透率为753.13g/m2·h。
结论:
结果表明,叶状镍黑光热转换膜在海水淡化中具有较好的作用,且电解时间为20min时膜的蒸汽渗透率最大。
Claims (2)
1.一种可以实现高效光热转换的针叶状镍黑膜,其特征在于,制备的具体步骤为:
(1)将一定量的硫酸铵加入溶剂中,持续搅拌至充分溶解,形成均匀的电解液;
(2)以泡沫镍为阴极,镍板为双阳极,将电极放入电解液中,并调整电极间距离;
(3)打开直流电源,调整外加电压、电解时间以调控制阴极上镍黑的含量,随着电解时间的增加电解液中的Ni2+浓度呈现增加的趋势,电流密度也呈现增加的趋势,沉积到阴极上的镍黑形成具有光陷作用的针叶状结构;
(4)该针叶状镍黑的有效成分为Ni纳米粒子以及NiO·OH,其反应如下:
Ni + 6NH3 + 2H2O → [Ni(NH3)6]2+ + 2OH- +H2↑
Ni2++ e - → Ni
Ni2+ + 2OH- → Ni(OH)2
Ni(OH)2+OH-→NiO·OH+H2O
(5)将镀好的镍黑光热转换膜在去离子水中清洗,取出后60℃烘箱烘干12小时,其表面生长一层具有光热转换作用的针叶状镍黑活性层,可通过等离子共振作用进行光热转换。
2.权利要求1所述的可以实现高效光热转换的针叶状镍黑膜应用于太阳能驱动海水淡化方向。
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FR2481717A1 (fr) * | 1980-05-05 | 1981-11-06 | Anvar | Surface a haut pouvoir absorbant selectif et dispositif de conversion photothermique la comportant et procede pour sa preparation |
WO2012059789A1 (en) * | 2010-11-04 | 2012-05-10 | Selektif Teknoloji Sanayi Ticaret Limited Sirketi | Roll to roll manufacturing of solar selective sheets |
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FR2481717A1 (fr) * | 1980-05-05 | 1981-11-06 | Anvar | Surface a haut pouvoir absorbant selectif et dispositif de conversion photothermique la comportant et procede pour sa preparation |
WO2012059789A1 (en) * | 2010-11-04 | 2012-05-10 | Selektif Teknoloji Sanayi Ticaret Limited Sirketi | Roll to roll manufacturing of solar selective sheets |
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"Electrodeposition and characterization of nanostructured black nickel selective absorber coatings for solar–thermal energy conversion";F. I. Lizama-Tzec et al;《J Mater Sci: Mater Electron》;第第26卷卷;第5553-5561页 * |
"镍黑光热材料的制备及太阳能海水淡化性能研究";吴丹丹;《中国优秀硕士学位论文全文库 工程科技I辑》(第2020年第03期期) * |
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