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Functionalized metallic transition metal dichalcogenide (TaS) for nanocomposite membranes in direct methanol fuel cells
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2021, Vol.9 (1), p.6368-6381
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In this work, we designed a novel nanocomposite proton-exchange membrane (PEM) based on sulfonated poly(ether ether ketone) (SPEEK) and tantalum disulfide functionalized with terminal sulfonate groups (S-TaS
2
). The PEMs are prepared through a solution-casting method and exploited in direct methanol fuel cells (DMFCs). Two-dimensional S-TaS
2
nanoflakes were prepared as a functional additive to produce the novel nanocomposite membrane for DMFCs due to their potential as a fuel barrier and an excellent proton conductor. To optimize the degree of sulfonation (DS) of SPEEK and the weight percentage (wt%) of S-TaS
2
nanoflakes in PEMs, we used the central composite design of the response surface method. The optimum PEM was obtained for SPEEK DS of 1.9% and a weight fraction (wt%) of S-TaS
2
nanoflakes of 70.2%. The optimized membrane shows a water uptake of 45.72%, a membrane swelling of 9.64%, a proton conductivity of 96.24 mS cm
−1
, a methanol permeability of 2.66 × 10
−7
cm
2
s
−1
, and a selectivity of 36.18 × 10
4
S s cm
−3
. Moreover, SPEEK/S-TaS
2
membranes show superior thermal and chemical stabilities compared to those of pristine SPEEK. The DMFC fabricated with the SPEEK/S-TaS
2
membrane has reached the maximum power densities of 64.55 mW cm
−2
and 161.18 mW cm
−2
at 30 °C and 80 °C, respectively, which are ∼78% higher than the values obtained with the pristine SPEEK membrane. Our results demonstrate that SPEEK/S-TaS
2
membranes have a great potential for DMFC applications.
Novel nanocomposite proton-exchange membranes based on sulfonated poly(ether ether ketone) (SPEEK) and functionalized tantalum disulfide (S-TaS
2
) overcome the dichotomy of the properties of SPEEK membranes for direct methanol fuel cells.