Efficient NiSe-Ni3Se2/Graphene Electrocatalyst in Dye-Sensitized Solar Cells: The Role of Hollow Hybrid Nanostructure

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• 作者：Xiao Zhang ; Mengmeng Zhen ; Jinwu Bai ; Shaowei Jin ; Lu Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：8
• 期：27
• 页码：17187-17193
• 全文大小：502K
• 年卷期：0
• ISSN：1944-8252

文摘

Hollow and hybrid nanomaterials are excellent electrocatalysts on account of their novel electrocatalytic properties compared with homogeneous solid nanostructures. In this report, NiSe-Ni₃Se₂ hybrid nanostructure with morphology of hollow hexagonal nanodisk was synthesized in situ on graphene. A series of NiSe-Ni₃Se₂/RGO with different phase constitutions and nanostructures were obtained by controlling the durations of solvothermal treatment. Because of their unique hollow and hybrid structure, NiSe-Ni₃Se₂/RGO hollow nanodisks exhibited higher electrocatalytic performance than NiSe/RGO and solid NiSe-Ni₃Se₂/RGO nanostructure for reducing I₃^– as counter cell (CE) of dye-sensitized solar cells (DSSCs). Additionally, NiSe-Ni₃Se₂/RGO hollow nanodisks achieved much lower charge transfer resistance (R_ct = 0.68 Ω) and higher power conversion efficiency (PCE) (7.87%) than those of Pt (R_ct = 1.41 Ω, PCE = 7.28%).