针对溶胶-凝胶法制备太阳光热转换吸收薄膜的关键问题,筛选了过渡金属盐并考察了还原条件,结果表明不需要外加还原剂,直接利用溶胶配方组分就可以将硝酸镍完全原位还原成单质镍.配方中镍含量为80%(m(镍)∶m(铝)=80∶20)时获得最好的吸收率,灼烧温度以600℃为宜.依据这样条件,0.8mol/L溶胶制备的太阳光热转换吸收薄膜吸收率可达0.82.
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