夹心型多酸修饰TiO_2在染料敏化太阳能电池中的应用  

Application of sandwich-type polyoxometalates modified TiO_2 in dye-sensitized solar cells

作　　者：张鹤[1] 李建平[1] 陈维林[1] 王恩波[1] He Zhang;Jian-Ping Li;Wei-Lin Chen;En-Bo Wang(Key Laboratory of Polyoxometalates Science Ministry of Education in Northeast Normal University,ChangChun 130024,China)

机构地区：[1]东北师范大学多酸科学教育部重点实验室,长春130024

出　　处：《科学通报》2018年第32期3333-3341,共9页Chinese Science Bulletin

基　　金：中央高校基础研究基金(2412017FZ012;2412018QD003);吉林省自然科学基金(20180101298JC)资助

摘　　要：染料敏化太阳能电池(DSSCs)作为一种新型的光学器件近年来受到广泛关注.然而,光生电子-空穴复合严重影响染料敏化太阳能电池的光电转化效率.多金属氧酸盐(POMs)具有优良的光电化学性质,能够作为极好的电子萃取剂应用于染料敏化太阳能电池光阳极中.本文通过溶胶凝胶法将具有分子内电子转移特性的夹心型多酸化合物K_(15){K_3[(A-α-PW_9O_(34))_2Fe_2(C_2O_4)_2]}·29H_2O与TiO_2复合,制备POM@TiO_2复合光阳极.光学和电化学测试表明,其最低未占分子轨道(LUMO)能级(-0.06V)低于TiO_2导带,光学带隙为2.82eV.光伏性能测试表明基于POM@TiO_2/P25复合光阳极的DSSC效率达到了6.33%,相比于纯TiO_2光阳极电池(5.52%)提高了15%.电化学阻抗谱(EIS)、暗电流测试和开路电压衰减测试证明夹心型多酸化合物有效地抑制电子-空穴复合,增长电子寿命.入射单色光子-电子转化效率(IPCE)测试进一步证明此多酸的引入增强了单色光转化效率(从35%提高到53%).Nowadays, the rapid consumption of fossil energy has led to global energy shortage. At present, more than 80% of the energy consumed globally is derived from non-renewable fossil fuels such as coal, oil and natural gas. The burning of fossil fuels will also bring about a series of problems such as the greenhouse effect, the falling quality of global air, the formation of acid rain and the pollution of water bodies. Therefore, whether new energy sources that can replace fossil energy can be found has become an increasingly popular concern problem. Dye-sensitized solar cells（DSSCs） as a new type of renewable energy source have attracted wide attention in recent years, because of their simple fabrication process, low production costs, relatively high photoelectric conversion efficiency（PCE）, and being environmentally safe. But the recombinations of photogenerated electrons holes are seriously affected the photoelectric conversion efficiency of DSSCs. Polyoxometalates（POMs） are a class of metal oxide clusters with the highest oxidation state of tungsten, molybdenum or vanadium. Due to their structural diversity and unique physicochemical properties, they have been applied in catalysis, photochemistry, biology and medicine. However, due to POMs have excellent photoelectrochemical properties, which can be used as an excellent electronic extractant in the photoanode of DSSCs. Here, the sandwich-type polyoxometalates compound K15{K3[（A-α-PW9O34）2 Fe2（C2O4）2]}·29 H2O with the intramolecular electron transfer properties is composited with TiO2 by sol-gel method to prepare a POM@TiO2 composite photoanode. The energy band structure of the polyoxometalate is studied by optical and electrochemical measurements. The result shows that the LUMO energy level（-0.06 V） of the sandwich-type polyoxometalates is lower than that of TiO2 and the optical band gap is 2.28 eV. The performance test shows that the DSSC efficiency of POM@TiO2 composite photoanode production reached 6.33%, which is 15% higher than that

关 键 词：染料敏化太阳能电池 多金属氧酸盐 光阳极 电子传输 电子-空穴复合 

分 类 号：TM914.4[电气工程—电力电子与电力传动]