多孔Ni_xCo_yS薄膜在染料敏化太阳能电池中的应用研究

Application of Porous Ni_xCo_yS Films in Dye-sensitized Solar Cells

为了进一步提高基于硫化镍钴电极的染料敏化太阳能电池光伏性能,将以自组装形成的二维聚苯乙烯光子晶体为模板,采用反向恒压电沉积技术制备一种具有多孔结构的硫化镍钴薄膜(Ni x Co y S-PC),并直接作为对电极应用于染料敏化太阳能电池中。对比测试结果发现,Ni x Co y S-PC电极展现出了比无多孔结构的硫化镍钴(Ni x Co y S-FTO)电极、铂电极更加优异的电催化性能,这是因为多孔结构有利于提高其电催化活性位点及氧化还原电对I-/I-3的扩散速率。因此,基于Ni x Co y S-PC电极的染料敏化太阳能电池展现出了较高的光电转换效率(5.80%),高于基于Ni x Co y S-FTO电极(5.43%)和铂电极(4.87%)的电池效率。

Recently,the photovoltaic performance of dye-sensitized solar cells(DSSCs)with nickel cobalt sulfide counter electrodes(CEs)is still needed to further improve.The assembled two-dimensional polystyrene photonic crystals are used as substrates to fabricate the porous nickel cobalt sulfide(Ni x Co y S-PC)films by a potential reversal electrodeposition technique.Meanwhile,the nickel cobalt sulfide(Ni x Co y S-FTO)films composed of nanoparticles are also fabricated by using fluorine-doped tin oxide(FTO)glasses as substrates.Then,Ni x Co y S-PC and Ni x Co y S-FTO films are served as CEs of DSSCs.The results show that Ni x Co y S-PC CE exhibits the higher electrocatalytic activity than that of Pt and Ni x Co y S-FTO CEs,due to their porous structure.The special morphology is beneficial to increase electrocatalytic active sites and improve the diffusion rate of the I-/I-3 redox couple.Therefore,the photoelectric conversion efficiency of the DSSC with Ni x Co y S-PC CE is up to 5.80%,which is larger than those of the DSSCs based on Ni x Co y S-FTO CE(5.43%)and Pt CE(4.87%).