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Optimization of Ni2+ /Ni3+ ratio in reduced graphene oxide/nickel oxide nanohybrids for platinum free dye sensitized solar cells

IR@NPL: CSIR-National Physical Laboratory, New Delhi


Field	Value

Title	Optimization of Ni2+ /Ni3+ ratio in reduced graphene oxide/nickel oxide nanohybrids for platinum free dye sensitized solar cells

Creator	Singh, Rajinder Kumar, Sanjeev Bedi, R. K. Saxena, Vibha Aswal, D. K. Mahajan, Aman

Subject	Chemistry Physics

Description	A strategy has been explored to design a novel network of reduced graphene oxide (rGO)/nickel oxide (NiO) nanohybrids with optimized Ni2+/Ni3+ ratio for the fabrication of compact, flexible, and large area Pt-free dye sensitized solar cells (DSSCs). The rGO/NiO nanohybrids were synthesized by a hydrothermal method and characterized by field emission scanning electron microscopy, Brunauer-Emmett-Teller analysis, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. These studies demonstrate that the rGO/NiO nanohybrids with Ni2+ rich species show high catalytic activity toward the I/I-3(-) redox reaction. This led to the fabrication of improved DSSCs with power conversion efficiency as high as 3.69% with these nanohybrids as counter electrodes in comparison with DSSC devices containing counter electrodes based on rGO (1.71%) and NiO (0.75%).

Publisher	Elsevier

Date	2018-12

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://npl.csircentral.net/3935/1/Optimization%20of%20Ni2.pdf Singh, Rajinder and Kumar, Sanjeev and Bedi, R. K. and Saxena, Vibha and Aswal, D. K. and Mahajan, Aman (2018) Optimization of Ni2+ /Ni3+ ratio in reduced graphene oxide/nickel oxide nanohybrids for platinum free dye sensitized solar cells. Journal of Physics and Chemistry of Solids, 123. pp. 191-197. ISSN 0022-3697

Relation	http://npl.csircentral.net/3935/