CN106057473A - 一种基于石墨烯量子点的全天候介孔敏化太阳能电池及其制备方法和应用 - Google Patents
一种基于石墨烯量子点的全天候介孔敏化太阳能电池及其制备方法和应用 Download PDFInfo
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Abstract
本发明提供了一种基于石墨烯量子点的全天候介孔敏化太阳能电池及其制备方法和应用,本发明具体是将糖类在一定温度下回流加热熔融,最终制得石墨烯量子点,并将其分散在水中形成水溶液。本发明充分利用石墨烯量子点可调的光学带隙、光吸收以及多激子产生效应,进而组装成全天候介孔敏化太阳能电池。本发明的石墨烯量子点的制备方法简单、性能稳定、成本低廉、改进空间大,所组装的基于石墨烯量子点的全天候介孔敏化太阳能电池光电转换效率较高。
Description
技术领域
本发明属于新材料技术以及新能源技术领域,具体涉及一种基于石墨烯量子点的全天候介孔敏化太阳能电池及其制备方法和应用。
背景技术
石墨烯量子点即具有石墨烯材料的优良性能,又具有量子限域效应和多激子产生和吸收效应使其在光电子器件领域的应用前景广阔。但目前简单易行大规模制备石墨烯量子点的方法还不成熟,石墨烯量子点在光电子器件方面的应用正处于起步阶段。因此,寻找一种简单方便大规模制备石墨烯量子点的方法是当前人类亟待解决的重要问题。由于石墨烯量子点优异的光电转换能力、较高的电子迁移率使其在太阳能电池方面的应用潜力很大,而目前的太阳能电池只能在白天发电,晚上就会失去作用,因此,开发石墨烯量子点的全天候敏化太阳能电池具有重要的理论意义和实用价值。
发明内容
本发明目的是针对目前石墨烯量子点制备过程繁琐、设备昂贵和太阳能电池发电的局限性等缺点提供了一种基于石墨烯量子点的全天候介孔敏化太阳能电池及其制备方法和应用,所述制备方法操作简单方便、环境友好及成本低廉。对促进石墨烯量子点的实用化,加速石墨烯量子点的产业化,减少太阳能电池发电的局限性具有重要的实用价值和经济价值。
为实现上述发明目的,本发明采用以下技术方案予以实现:
本发明提供了一种基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法,它包括以下步骤:
(1)、将糖类分散在水中配成糖类反应液;
(2)、在步骤(1)的糖类反应液中加入掺杂剂,并在160~180℃回流加热,颜色由无色变为黄色;
(3)、将步骤(2)得到的熔融的黄色胶体逐滴滴加到水中并剧烈搅拌,制备出石墨烯量子点水溶液;
(4)、制备二氧化钛胶体,将二氧化钛胶体涂于导电玻璃基体上,经煅烧制备出多孔二氧化钛薄膜;
(5)、将步骤(4)制备的二氧化钛薄膜浸入到步骤(3)中的石墨烯量子点水溶液中形成量子点敏化二氧化钛光阳极;
(6)、将步骤(5)制备的量子点敏化二氧化钛光阳极上涂覆长余辉材料;
(7)、配制含有氯铂酸的异丙醇溶液,用热解法在导电玻璃基底上制备铂对电极;
(8)、将步骤(6)制备的附着长余辉材料的量子点敏化二氧化钛光阳极和步骤(7)制备的铂对电极组合,并在中间加入液体电解质组装成全天候介孔敏化太阳能电池。
进一步的:所述步骤(1)中的糖类为葡萄糖、麦芽糖醇或蔗糖中的一种。
进一步的:所述步骤(1)中糖类反应液中糖类和水的质量比为1:0.3-1:0.5。
进一步的:所述步骤(2)中的掺杂剂为硫脲、尿素、氨水、二甲基甲酰胺、硫酸中的任意一种或两种。
进一步的:所述步骤(3)中石墨烯量子点水溶液的质量分数为0.02%~0.04%。
进一步的:所述步骤(6)中含有氯铂酸的异丙醇溶液中氯铂酸的浓度为0.015mol/L~0.025 mol/L。
本发明提供了权利要求1中步骤(1)~(3)所述的制备方法制得的石墨烯量子点水溶液。
本发明提供了所述的制备方法制得的基于石墨烯量子点的全天候介孔敏化太阳能电池。
进一步的:所述全天候介孔敏化太阳能电池在光照时的开路电压为0.5~0.6V、短路电流为0.3~0.4 mA·cm-2、填充因子为0.55~0.65、光电转换效率为0.1~0.2%;
当无光照情况下,长余辉材料发光并使电池继续工作发电,所述全天候介孔敏化太阳能电池的开路电压为0.4~0.5V、短路电流为0.03~0.04 mA·cm-2、填充因子为0.55~0.65、光电转换效率为20~30%。
本发明还提供了所述的基于石墨烯量子点的全天候介孔敏化太阳能电池在作为电池组件中的应用。
与现有技术相比,本发明的优点和技术效果是:本发明具体是将糖类在一定温度下回流加热熔融,最终生成石墨烯量子点并分散在水中形成水溶液。本发明充分利用石墨烯量子点可调的光学带隙、光吸收以及多激子产生效应,并进行合理的设计组装成量子点敏化全天候太阳能电池。本发明的石墨烯量子点制备方法简单、性能稳定、成本低廉、改进空间大,所组装的基于石墨烯量子点的全天候敏化太阳能电池光电转换效率良好。
附图说明
图1为本发明以蔗糖为碳源所制备的石墨烯量子点在紫外灯照射下的发光图片;
图2为本发明以蔗糖为碳源所制备的石墨烯量子点的紫外-可见吸收谱图;
图3为本发明以蔗糖为碳源所制备的石墨烯量子点的荧光光谱图;
图4为本发明以蔗糖为碳源所制备的石墨烯量子点组成的全天候量子点敏化太阳能电池的J-V曲线图;
图5为本发明以蔗糖为碳源所制备的石墨烯量子点的高倍透射电镜照片。
具体实施方式
下面结合具体实施方式对本发明的技术方案作进一步详细的说明。
实施例1
一、基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法包括以下步骤:
(1)、将1~3g糖类(如麦芽糖醇或蔗糖等)分散在0.3~0.7mL去离子水中配成糖类反应液(如果糖类选用葡萄糖,可以跳过此步骤直接进行加热回流);
(2)、在步骤(1)的糖类应液中加入一定量的掺杂剂,并在160~180℃加热回流,颜色由无色变为黄色;
(3)、将步骤(2)获得的熔融的黄色胶体逐滴滴加到80~120mL去离子水中并剧烈搅拌,制备出石墨烯量子点水溶液;
(4)、二氧化钛薄膜的制备:将常规溶胶-水热法制备的二氧化钛胶体涂于FTO或ITO导电玻璃基体上,控制膜厚度为5~15μm,经450℃煅烧30min,制备得到多孔二氧化钛纳米晶薄膜;
(5)、石墨烯量子点全天候敏化二氧化钛光阳极的制备:将步骤(4)制备的二氧化钛纳米晶薄膜浸入到步骤(3)的石墨烯量子点水溶液中形成量子点敏化二氧化钛光阳极;
(6)将步骤(5)制备的量子点敏化二氧化钛光阳极上涂覆长余辉材料;
(7)、配制含有浓度为0.02 mol/L氯铂酸的异丙醇溶液,用热解法在FTO导电玻璃基底上制备铂对电极;
(8)、石墨烯量子点敏化太阳能电池的组装:将步骤(6)制备的涂覆了长余辉材料的石墨烯量子点敏化二氧化钛光阳极和步骤(7)制备的铂对电极组合,并在中间加入液体电解质组装成全天候介孔敏化太阳能电池。所述液体电解质由0.01~0.06 mol/L碘、0.08~0.12mol/L碘化锂、0.4~0.8 mol/L四丁基碘化铵和0.4~0.6 mol/L 4-叔丁基吡啶的乙腈溶液组成。
二、石墨烯量子点全天候介孔敏化太阳能电池的测试
图1为本发明以蔗糖为碳源所制备的石墨烯量子点在紫外灯照射下的发光图片,本发明所制备的石墨烯量子点在365纳米的紫外灯的照射下发出蓝色荧光。
图2为本发明以蔗糖为碳源所制备的石墨烯量子点的紫外-可见吸收光谱图,本发明所制备的石墨烯量子点在稀释不同倍数时都在230纳米和285纳米处有吸收峰,且随着稀释倍数的增加,吸收峰的峰值高度降低。
图3为本发明以蔗糖为碳源所制备的石墨烯量子点在不同激发波长下的荧光光谱图,本发明所制备的石墨烯量子点在激发波长为370纳米时所发射出的荧光信号强度最强,且所发出的荧光波长为436纳米,为蓝色荧光。随着激发波长的增大,本发明所制备的石墨烯量子点所发射出的荧光波长也随之增大,且强度降低。
图4为本发明以蔗糖为碳源所制备的石墨烯量子点组装成的全天候介孔敏化太阳能电池J-V曲线图,通过上述制备方法,可获得在光照条件下开路电压为0.5~0.6V、短路电流为0.3~0.4 mA·cm-2、填充因子为0.55~0.65、光电转换效率为0.1~0.2%的全天候介孔敏化太阳能电池。当无光照情况下,长余辉材料会发出绿色的光并可使电池继续工作发电,获得开路电压为0.4~0.5V、短路电流为0.03~0.04 mA·cm-2、填充因子为0.55~0.65、光电转换效率为20~30%的基于石墨烯量子点的全天候介孔敏化太阳能电池。本发明制得的所述基于石墨烯量子点的全天候介孔敏化太阳能电池可作为电池组件应用。
图5为本发明以蔗糖为碳源所制备的石墨烯量子点的高倍透射电镜图片,经测量知相邻两晶格条纹间距约为0.248纳米,与石墨烯量子点的(101)晶面所对应。
以上实施例仅用以说明本发明的技术方案,而非对其进行限制;尽管参照前述实施例对本发明进行了详细的说明,对于本领域的普通技术人员来说,依然可以对前述实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或替换,并不使相应技术方案的本质脱离本发明所要求保护的技术方案的精神和范围。
Claims (10)
1.一种基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法,其特征在于它包括以下步骤:
(1)、将糖类分散在水中配成糖类反应液;
(2)、在步骤(1)的糖类反应液中加入掺杂剂,并在160~180℃回流加热,颜色由无色变为黄色;
(3)、将步骤(2)得到的熔融的黄色胶体逐滴滴加到水中并剧烈搅拌,制备出石墨烯量子点水溶液;
(4)、制备二氧化钛胶体,将二氧化钛胶体涂于导电玻璃基体上,经煅烧制备出多孔二氧化钛薄膜;
(5)、将步骤(4)制备的二氧化钛薄膜浸入到步骤(3)中的石墨烯量子点水溶液中形成量子点敏化二氧化钛光阳极;
(6)、将步骤(5)制备的量子点敏化二氧化钛光阳极上涂覆长余辉材料;
(7)、配制含有氯铂酸的异丙醇溶液,用热解法在导电玻璃基底上制备铂对电极;
(8)、将步骤(6)制备的附着长余辉材料的量子点敏化二氧化钛光阳极和步骤(7)制备的铂对电极组合,并在中间加入液体电解质组装成全天候介孔敏化太阳能电池。
2.根据权利要求1所述的基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法,其特征在于:所述步骤(1)中的糖类为葡萄糖、麦芽糖醇或蔗糖中的一种。
3.根据权利要求1所述的基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法,其特征在于:所述步骤(1)中糖类反应液中糖类和水的质量比为1:0.3~1:0.5。
4.根据权利要求1所述的基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法,其特征在于:所述步骤(2)中的掺杂剂为硫脲、尿素、氨水、二甲基甲酰胺、硫酸中的任意一种或两种。
5.根据权利要求1所述的基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法,其特征在于:所述步骤(3)中石墨烯量子点水溶液的质量分数为0.02%~0.04%。
6.根据权利要求1所述的基于石墨烯量子点的全天候介孔敏化太阳能电池的制备方法,其特征在于:所述步骤(6)中含有氯铂酸的异丙醇溶液中氯铂酸的浓度为0.015 mol/L~0.025 mol/L。
7.权利要求1中步骤(1)~(3)所述的制备方法制得的石墨烯量子点水溶液。
8.根据权利要求1-6任一项所述的制备方法制得的基于石墨烯量子点的全天候介孔敏化太阳能电池。
9.根据权利要求8所述的基于石墨烯量子点的全天候介孔敏化太阳能电池,其特征在于:所述全天候介孔敏化太阳能电池在光照时的开路电压为0.5~0.6V、短路电流为0.3~0.4mA·cm-2、填充因子为0.55~0.65、光电转换效率为0.1~0.2%;
当无光照情况下,长余辉材料发光并使电池继续工作发电,所述全天候介孔敏化太阳能电池的开路电压为0.4~0.5V、短路电流为0.03~0.04 mA·cm-2、填充因子为0.55~0.65、光电转换效率为20~30%。
10.根据权利要求8所述的基于石墨烯量子点的全天候介孔敏化太阳能电池在作为电池组件中的应用。
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