紫木槿花天然敏化剂和生物炭对电极组装的染料敏化太阳电池

Dye-sensitized solar cell employing natural sensitizer and biochar counter electrode derived from purple hibiscus flower

以紫木槿花为原料,分别采用乙醇浸提法和单步热解法制备出天然染料和生物炭,将两者分别作为光敏剂和对电极引入染料敏化太阳电池(DSSC)中,在分析紫木槿花天然染料和生物炭的结构特征的基础上,着重探究了器件的光电性能。结果表明:紫木槿花天然染料中主要成分是花青素中的芍药色素、锦葵色素、飞燕草色素及天竺葵色素,仅将其作为光敏剂,器件的转换效率为0. 18%;紫木槿花生物炭是一种多级孔隙结构的玻璃碳,相比于石墨,具有更大的比表面积、更强的电解质扩散能力及更多的催化还原I3-的活性点;仅将其作为对电极应用到DSSC中,转换效率为1. 08%;当同时将紫木槿花天然染料和生物炭引入DSSC其转换效率为0. 13%。

The natural dyes and biochar were prepared by ethanol extraction and one-step pyrolysis with purple hibiscus flower as raw material,then applied as photosensitizer and counter electrode for dye-sensitized solar cell ( DSSC) . Based on the structure characteristic analyses of the natural dyes and biochar, the photoelectric properties of the DSSC were investigated emphatically The results indicated that the natural dyes derived from purple hibiscus flower mainly contain anthocyanin,including peonidin,malvidin, delphinidin and pelargonidin. The conversion efficiency of DSSC was 0. 18% by replaced the photosensitizer with natural dyes. The biochar derived from purple hibiscus flower compared to graphite has greater specific surface area,stronger electrolyte diffusion ability and more catalytic reduction activity point of I3 -,this can be attributed to the favorable characteristics of the biochar,such as hierarchical pore structure and glassy carbon skeleton. The efficiency of the biochar based DSSC was 1. 08%. The conversion efficiency was 0. 13% when the natural dyes and biochar from purple hibiscus flower were introduced into the DSSC.