Surface-modified Y zeolite-filled chitosan membrane for direct methanol fuel cell

Wu, Hong; Zheng, Bin; Zheng, Xiaohong; Wang, Jingtao; Yuan, Wei; Jiang, Zhongyi

doi:10.1016/j.jpowsour.2007.08.020

Cited by 123 publications

(105 citation statements)

References 41 publications

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“…In Figure 4c, the lower intensities of the bands associated with the amide groups, as compared to that assigned to the C−O stretching of chitosan, can be related to the interaction between the -NH 3 + and -SO 3 -groups in the chitosan/PVS LbL film. 10 Moreover, the band at 1191 cm -1 disappears, and a band appears at 891 cm -1 in Figure 4c, which is associated with the interaction between the -NH 3 + and -SO 3 -groups, in accord with the theoretical calculation for the model complex shown above (see details in Supplementary Information, SI). The band broadening detected between 1140 and 1240 cm -1 probably corresponds to the interaction of the non-complexed sulfonic group with the protonated amine group.…”

Section: Resultssupporting

confidence: 81%

“…The resistance of the membranes was determined from the intersection of the impedance data with the real axis in the Nyquist diagrams for high frequencies, which is associated with the proton conductivity (2.5 × 10 -2 and 2.3 × 10 -2 S cm -1 for Nafion ® and chitosan/PVS/Nafion ® , respectively). Although proton conductivity is normally lower for chitosan as compared to Nafion ® , 8,10 the thin LbL film of chitosan/PVS deposited onto the Nafion ® membrane film hardly contributes to enhancing the resistance corresponding to proton transport. Figure 6a shows the cyclic voltammetry experiments for the Pt electrode in the presence of several different methanol concentrations, in 0.5 mol L -1 H 2 SO 4 .…”

Section: Resultsmentioning

confidence: 99%

“…[5][6][7] Chitosan is the deacetylated form of chitin, a polysaccharide present in the shells of crabs and in the exoskeleton of shrimps, and can be used as a PEM for DMFCs. [8][9][10] The cross-linked chitosan membranes in H 2 SO 4 exhibit low permeability to methanol as well as low electronic conductivity. Moreover, these membranes have high thermal and chemical stabilities, do not release environmental contaminants upon overheating up to 200 °C and their discharge into the environment is not polluting.…”

Section: Introductionmentioning

confidence: 99%

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Self-assembled films from chitosan and poly(vinyl sulfonic acid) on Nafion® for direct methanol fuel cell

Vinhola¹,

Facci²,

Dias³

et al. 2012

J. Braz. Chem. Soc.

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Filmes de quitosana/poli(ácido vinilsulfônico) (PVS) foram depositados sobre membranas de Nafion ® a partir do método camada por camada (LbL), visando o seu uso em células a combustível de metanol direto (DMFC). Métodos computacionais e espectros de infravermelho com transformada de Fourier (FTIR) sugerem a formação de um par iônico entre o grupo sulfônico do PVS e o grupo amino protonado da quitosana, o qual promove o crescimento dos filmes LbL sobre a membrana de Nafion ® , assim como impede parcialmente a passagem de metanol. Experimentos de cronopotenciometria e varredura linear de potencial foram realizados a fim de se investigar a passagem de metanol através das membranas de Nafion ® e quitosana/PVS/Nafion ® em uma célula a diafragma. Os valores de resistência iônica associada ao transporte de prótons nas membranas de Nafion ® e quitosana/PVS/Nafion ® são próximos, de acordo com as medidas de impedância elétrica devido à pequena espessura do filme LbL. Assim, espera-se um melhor desempenho da DMFC, uma vez que a resistência do filme automontado é insignificante comparada ao resultado associado à passagem de metanol através das membranas.Chitosan/poly(vinyl sulfonic acid) (PVS) films have been prepared on Nafion ® membranes by the layer-by-layer (LbL) method for use in direct methanol fuel cell (DMFC). Computational methods and Fourier transform infrared (FTIR) spectra suggest that an ionic pair is formed between the sulfonic group of PVS and the protonated amine group of chitosan, thereby promoting the growth of LbL films on the Nafion ® membrane as well as partial blocking of methanol. Chronopotentiometry and potential linear scanning experiments have been carried out for investigation of methanol crossover through the Nafion ® and chitosan/PVS/Nafion ® membranes in a diaphragm diffusion cell. On the basis of electrical impedance measurements, the values of proton resistance of the Nafion ® and chitosan/PVS/Nafion ® membranes are close due to the small thickness of the LbL film. Thus, it is expected an improved DMFC performance once the additional resistance of the self-assembled film is negligible compared to the result associated with the decrease in the crossover effect.Keywords: chitosan, direct methanol fuel cell, proton exchange membrane, crossover effect, methanol permeability IntroductionDirect methanol fuel cells (DMFCs) are the most promising portable, stationary power sources with application in several fields. In these cells, methanol and air are continually injected into the anode and cathode compartments, respectively, thus providing energy with high efficiency. Methanol has been largely employed as fuel once it is abundant and inexpensive. Even though DMFCs produce carbon dioxide, which is released into the atmosphere, their high efficiency guarantees low pollution as compared to other power sources. [1][2][3] One drawback of DMFCs is the so-called crossover effect, through which methanol leaves the anodic compartment and crosses the proton exchange membrane (PEM), thereby promoting cell de...

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Self-assembled films from chitosan and poly(vinyl sulfonic acid) on Nafion® for direct methanol fuel cell

Vinhola¹,

Facci²,

Dias³

et al. 2012

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

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“…Representing the quantity of acid equivalents per gram of polymer [20,29], ionexchange capacity is an indirect and reliable approximation of the proton conductivity of the membranes [15]. Here, the ion-exchange capacity of the membrane was determined by an acidbased titration method.…”

Section: Ion-exchange Capacitymentioning

confidence: 99%

“…Many researchers have selected inorganic materials to improve the water retention in the membrane and also to decrease the alcohol crossover [12][13][14][15]. Zeolite is a well-defined microporous structure of crystalline aluminosilicates containing silicon and oxygen in its framework.…”

Section: Introductionmentioning

confidence: 99%

Mordenite/Nafion and analcime/Nafion composite membranes prepared by spray method for improved direct methanol fuel cell performance

Prapainainar

Kongkachuichay

et al. 2017

Applied Surface Science

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Highlight Mordenite and analcime were used as fillers in Nafion composite membranes for DMFC. The composite membranes were fabricated by spray method. Methanol permeability was reduced up to 2-3 times using the composite membranes. Mordenite/Naifon membrane showed 2 times higher DMFC performance than Nafion117. AbstractThe aim of this work was to improve proton exchange membranes (PEMs) used in direct methanol fuel cells (DMFCs). A membrane with a high proton conductivity and low methanol permeability was required. Zeolite filler in Nafion (NF matrix) composite membranes were prepared using two types of zeolite, mordenite (MOR) and analcime (ANA). Spray method was used to prepare the composite membranes, and properties of the membranes were investigated: mechanical properties, solubility, water and methanol uptake, ion-exchange capacity (IEC), proton conductivity, methanol permeability, and DMFC performance. It was found that MOR filler showed higher performance than ANA. The MOR/Nafion composite membrane gave better properties than ANA/Nafion composite membrane, including a higher proton conductivity and a methanol permeability that was 2 -3 times lower. The highest DMFC performance (10.75 mW·cm -2 ) was obtained at 70 °C and with 2 M methanol, with a value 1.5 times higher than that of ANA/Nafion composite membrane and two times higher than that of commercial Nafion 117 (NF 117).

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High Performance Polymer Hydrogel Based Materials for Fuel Cells

Sahai

2013

Polymers for Energy Storage and Conversion

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Surface-modified Y zeolite-filled chitosan membrane for direct methanol fuel cell

Cited by 123 publications

References 41 publications

Self-assembled films from chitosan and poly(vinyl sulfonic acid) on Nafion® for direct methanol fuel cell

Self-assembled films from chitosan and poly(vinyl sulfonic acid) on Nafion® for direct methanol fuel cell

Mordenite/Nafion and analcime/Nafion composite membranes prepared by spray method for improved direct methanol fuel cell performance

High Performance Polymer Hydrogel Based Materials for Fuel Cells

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