Journal
CARBOHYDRATE POLYMERS
Volume 208, Issue -, Pages 504-512Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.12.092
Keywords
Chitosan; Nanocomposite membrane; Proton conductivity; Methanol permeability; Exfoliated molybdenum disulfide; Direct methanol fuel cells
Categories
Funding
- Science and Engineering Research Board (SERB), Government of India [EMR/2016/007670]
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Chitosan based proton exchange membranes (PEMs) has been synthesized by a facile solution casting strategy using two-dimensional exfoliated molybdenum disulfide (E-MoS2) nanosheets. The prepared PEMs are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Field-emission scanning electron microscopy (FESEM) with Energy dispersive X-ray spectroscopy (EDX), water uptake, Thermogravimetric analysis (TGA), AC impedance spectroscopy and cyclic voltammetry. In comparison with pure chitosan membrane, E-MoS2 nanosheets incorporated membranes exhibit excellent water absorbing capacity, ion-exchange capacity and proton conductivity. Moreover, the changes in roughness of nanocomposite membranes is investigated by atomic force microscopy (AFM) and the results confirm that the E-MoS2 nanosheets content enhances the surface roughness as well as provide good mechanical and thermal resistivity to the chitosan/E-MoS2 membranes. Chitosan membranes with 0.75% E-MoS2 nanosheets demonstrated higher proton conductivity of 2.92 x 10(-3) Scm(-1) and membrane selectivity of 8.9 x 10(4) Scm(-3) s with reduced methanol permeability of 3.28 x 10(-8) cm(2) s(-1). Overall, results evidenced that the chitosan/E-MoS2 nanocomposite membranes will be an alternate to Nafion in direct methanol fuel cells (DMFCs).
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