Low-cost Preparation of Graphene Papers from Chemical Reduction with FeI2/Ni2+ for Conductivity and Catalytic Propert

doi:10.15541/jim20170001

Abstract

Abstract:

A novel method to produce reductive graphene oxide (RGO) with FeI₂/Ni²⁺ applied as reductive agent was reported. This method provides a cheap, effective and environmentally friendly route for the large-scale production of RGO without losing its high conductivity and catalytic activity. An extremely high conductivity of 30231 S/m was obtained affer the optimized FeI₂/Ni(NO₃)₂ solution treatment. The enhancement of bulk conductivity was clue to the promotion of the nucleophilic substitution reaction induced by Fe²⁺(a strong Lewis acid). Ni²⁺was introduced to optimize the reductive process by reducing the concentration of hydrogen ions, which would inhibit the hydrolysis of Fe²⁺. Furthermore, a high cathodic peak current density was observed when applying the free-standing RGO paper as counter electrode in I^-/I^3- electrolyte system, indicating the high catalytic performance of the RGO paper and providing electron transporting pathway. These outstanding features exhibit a promising prospect of application in solar cells.

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Key words: graphene oxide, metal iodides, chemical reduction, bulk conductivity, catalytic

CLC Number:

TQ174

NAN Hui, WANG Wen-Li, HAN Jian-Hua, YIN Xue-Wen, ZHOU Yu, ZHAO Xiao-Chong, LIN Hong. Low-cost Preparation of Graphene Papers from Chemical Reduction with FeI₂/Ni²⁺for Conductivity and Catalytic Propert[J]. Journal of Inorganic Materials, 2017, 32(9): 997-1003.

Figures/Tables 8

Fig. 1 Cross section SEM images of the original GO film (a) and RGO films (b) after reduction; Sheet resistance and conductivity of as-prepared RGO (c) reduced with different time (d), temperature (e), reductant (f)

Fig. 2 XRD patterns of raw graphite, GO, and RGO reduced with different reductant (a); by FeI2/Ni(NO3)2 with different temperatures (b) and for different time (c)

Fig. 3 FTIR spectra (a) and Raman spectra (b) of GO and RGO reduced by different reductan

Fig. 4 SEM images of GO (a, b) and TEM images of RGO (c, d) reduced with FeI2/Ni(NO3)2

Fig. 5 XPS spectra of GO (a) and those of corresponding RGO reduced with FeI2 (b) and FeI2/Ni(NO3)2 (c)

Table 1 ID/IG of GO and RGO reduced with different solutions

Sample	Reductant	I_D/(a.u.)	I_G/(a.u.)	I_D/I_G
GO		499.7	462.5	1.08
RGO	FeI₂	377.3	237.3	1.59
RGO	FeI₂/NiCl₂	402.2	251.7	1.60
RGO	FeI₂/Ni(NO₃)₂	389.6	250.2	1.66
RGO	FeI₂/NiSO₄	564.8	389.2	1.45

Fig. 6 Changes of color of different reductant with time (a) FeI2; (b) FeI2/Ni(NO3)2

Fig. 7 CV curves for RGO reduced with different reductant (a) and CV curves for RGO reduced by FeI2/ Ni(NO3)2 with different cycle numbers (b)

References 29

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Low-cost Preparation of Graphene Papers from Chemical Reduction with FeI₂/Ni²⁺for Conductivity and Catalytic Propert

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