Ultrathin Ni-Ni3Se2 nanosheets on graphene as a high-performance counter electrode for dyesensitized solar cells

作者：Zhang, Xiao; Bai, Jinwu; Zhen, Mengmeng; Liu, Lu^*

来源：RSC Advances, 2016, 6(92): 89614-89620.

DOI：10.1039/c6ra18151a

• IN-SITU GROWTH
• HIGH-EFFICIENCY
• OXYGEN EVOLUTION
• LITHIUM STORAGE
• ELECTROCATALYST
• NI0.85SE
• NANOPARTICLES
• SPHERES
• OXIDE

Ultrathin nanostructures of metal chalcogenides have exhibited excellent electrocatalytic activity due to the high percentage of surface atoms and many exposed interior atoms, which inevitably induce the formation of defects serving as highly efficient active sites. Here we report for the first time a high-performance electrocatalyst of ultrathin Ni-Ni3Se2 nanosheets on graphene nanosheets. Specifically, the thickness of the obtained nanosheets is in the range of 1.5-2.5 nm. Furthermore, the specific surface area of the ultrathin Ni-Ni3Se2/graphene nanosheets was as much as similar to 162.5 m(2) g(-1). The electrocatalytic activity of Ni-Ni3Se2/graphene nanosheets was measured as a counter cell of dye-sensitized solar cells. Ni-Ni3Se2/graphene nanosheets exhibited high performance for the reduction of I-3(-) to I-, and achieved higher power conversion efficiency (7.76%) compared with that of the Pt-based reference electrode (7.42%).

• 出版日期2016
• 单位南开大学