多孔硫化镍薄膜制备及其电催化性能研究

Fabrication and electrocatalytic performance of porous nickel sulfide films

针对硫化镍对电极的电催化性能有待提高问题,分别以氟掺杂氧化锡导电玻璃、二维聚苯乙烯阵列为衬底,采用反向恒压电沉积技术制备由纳米颗粒构成的硫化镍(NiSx)薄膜及具有类蜂窝状结构的多孔硫化镍(P-NiSx)薄膜。测试结果表明,以P-NiSx薄膜作为对电极展现出了良好的电催化性能,并优于铂电极及NiSx电极。原因是P-NiSx电极的多孔结构拥有较大的比表面积,有利于提供较多的电催化活性位点及提高氧化还原电对I^-/I3^-的扩散速率。因此,基于P-NiSx对电极的染料敏化太阳能电池的光电转换效率达到6.66%,不仅高于由铂电极组装的电池器件效率(5.54%),而且也高于由NiSx电极组装的电池器件效率(5.73%)。

The electrocatalytic performance of nickel sulfide counter electrodes (CEs) could be further improved by constructing the special morphology. In this work, fluorine - doped tin oxide glass and two - dimensional polystyrene array are served as the substrates to fabricate the nickel sulfide (NiSx) and porous nickel sulfide (P-NiSx) films by a potential reversal electrodeposition technique. NiSx film is composed of nanoparticles, while P-NiSx film shows a honeycomb-like structure. The analysis results show that the P-NiSx CE exhibits excellent electrocatalytic activity, which is larger than that of Pt and NiSx CEs. It can be ascribed to the larger specific surface area of the porous P-NiSx CE, which is beneficial to provide the more electrocatalytic active sites and increase the diffusion rate of I^-/I3^- redox couple. The J-V curves indicate that the power conversion efficiency of the dye-sensitized solar cell (DSC)assembled from P-NiSx CE reaches 6.66%,which is larger than that of DSCs assembled from PtCE(5.54%)and NiSxCE (5.73%).