title: Facet-dependent NiS2 polyhedrons on counter electrodes for dye-sensitized solar cells.
abstract: Octahedral and cubic NiS2 nanocrystals enclosed by {111} and {100} planes were separately used as counter electrodes (CEs) incorporated into Pt-free dye-sensitized solar cells (DSSCs). The DSSC assembled by NiS2 octahedrons exhibited a conversion efficiency of 5.98%, better than that by NiS2 cubes (5.43%). DFT calculations indicate that the better catalytic effect could be ascribed to higher surface energy, more active sites, and more suitable adsorption energy of {111} planes compared with the {100} planes.
authors.affiliation: School of Chemistry and Environment, Beihang University, Beijing 100191, China. zhouwei@buaa.edu.cn guolin@buaa.edu.cn.
authors.forename: Jinlong
authors.initials: J
authors.lastname: Zheng
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.forename: Yiran
authors.initials: Y
authors.lastname: Ma
authors.forename: Wei
authors.initials: W
authors.lastname: Cao
authors.forename: Chengbo
authors.initials: C
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Guo