Proton exchange membranes modified with sulfonated silica nanoparticles for direct methanol fuel cells☆

Su, Yu‐Sheng; Liu, Ying‐Ling; Sun, Yi-Ming; Lai, Juin‐Yih; Wang, Da-Ming; Gao, Yan; Liu, Baijun; Guiver, Michael D.

doi:10.1016/j.memsci.2007.03.007

Cited by 153 publications

(45 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar phenomena were also observed previously [43,44]. The enhancement of water reservation and reachability of acid sites on proton transport and electrochemical polarization was examined in this section.…”

Section: Influence Of Moisture Level On Proton Transport In the Composupporting

confidence: 80%

Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir

et al. 2012

View full text Add to dashboard Cite

Assimilating hydrophilic hollow polymer spheres (HPS) into Nafion matrix by a loading of 0.5 wt % led to a restructured hydrophilic channel, composed of the pendant sulfonic acid groups (-SO 3 H) and the imbedded hydrophilic hollow spheres. The tiny hydrophilic hollow chamber was critical to retaining moisture and facilitating proton transfer in the composite membranes. To obtain such a tiny cavity structure, the synthesis included selective generation of a hydrophilic polymer shell on silica microsphere template and the subsequent removal of the template by etching. The hydrophilic HPS (100-200 nm) possessed two different spherical shells, the styrenic network with pendant sulfonic acid groups and with methacrylic acid groups, respectively. By behaving as microreservoirs of water, the hydrophilic HPS promoted the Grotthus mechanism and, hence, enhanced proton transport efficiency through the inter-sphere path. In addition, the HPS with the -SO 3 H borne shell played a more effective role than those with the -CO 2 H borne shell in augmenting proton transport, in particular under low humidity or at medium temperatures. Single H 2 -PEMFC test at 70 °C using dry H 2 /O 2 further verified the impactful role of hydrophilic HPS in sustaining higher proton flux as compared to pristine Nafion membrane.

show abstract

Section: Influence Of Moisture Level On Proton Transport In the Composupporting

confidence: 80%

Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir

et al. 2012

View full text Add to dashboard Cite

show abstract

“…However, the formation of proton conducting channels in the nanocomposite PEMs is still only a postulation. Our previous papers also reported that silica nanoparticles are effective as additives for PEMs for enhancing the properties of PEMs for use in DMFC [30,31].…”

Section: Introductionmentioning

confidence: 90%

Increases in the proton conductivity and selectivity of proton exchange membranes for direct methanol fuel cells by formation of nanocomposites having proton conducting channels

Liu

Wang

et al. 2009

Journal of Power Sources

View full text Add to dashboard Cite

We explore an approach to effectively enhance the properties of cost-effective hydrocarbon protonexchange membranes for application in the direct methanol fuel cell (DMFC). This approach utilizes sulfonated silica nanoparticles (SA-SNP) as additives to modify sulfonated poly(arylene ether ether ketone ketone) (SPAEEKK). The interaction between the sulfonic acid groups of SA-SNP and those of SPAEEKK combined with hydrophilic-hydrophobic phase separation induce the formation of proton conducting channels, as evidenced by TEM images, which contribute to increases in the proton conductivity of the SPAEEKK/SA-SNP nanocomposite membrane. The presence of SA-SNP nanoparticles also reduces methanol crossover in the membrane. Therefore, the SPAEEKK/SA-SNP nanocomposite membrane shows a high selectivity, which is 2.79-fold the selectivity of Nafion ® 117. The improved selectivity of the SPAEEKK/SNP nanocomposite membrane demonstrates potential of this approach in providing hydrocarbon-based PEMs as alternatives to Nafion in direct methanol fuel cells.

show abstract

“…Hybrid organic inorganic nanocompo sites have gained considerable attention because present improved properties such as swelling capacity, water retention or operating temperature, while maintaining mechanical proper ties [8 10]. In this line, there are several studies that reflect the improvement of performance of several polymers due to the incorporation of inorganic particles such as SiO 2 [11], TiO 2 [12] or zeolites [13]. Also, another inorganic fillers such as heteropo lyacids like phosphotungstic (PWA), phosphomolybdic (PMoA), silicotungstic (SiWA) and silicomolybdic (SiMoA) acids related to the well known Keggin structure, have recently received most attention due to their good proton conductivities [14 17].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel hybrid polysulfone/silica membranes doped with phosphomolybdic acid for fuel cell applications

Martínez-Morlanes

Martos

Várez

et al. 2015

Journal of Membrane Science

View full text Add to dashboard Cite

Novel proton conducting composite membranes based on sulfonated polysulfone (sPSU)/SiO 2 doped with phosphomolybdic acid (PMoA) were synthesized, and their proton conductivity in acid solutions was evaluated. The hybrid membranes were prepared by casting and the characterization by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X ray diffraction (XRD) confirmed the presence of the inorganic charges into the polymer. Thermal properties and proton conductivity were also studied by means of thermogravimetric analysis (TGA) and electrochemical impedance spectro scopy (EIS), respectively. The incorporation of the inorganic particles modified the thermal and mechanical properties of the sPSU as well as its proton conductivity. Taking into account that a compromise between these properties is necessary, the hybrid membrane with 2%SiO 2 and 20%PMoA seems to be a promising candidate for its application in proton exchange membrane in fuel cells (PEMFCs) operated at high temperatures.

show abstract

Proton exchange membranes modified with sulfonated silica nanoparticles for direct methanol fuel cells☆

Cited by 153 publications

References 39 publications

Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir

Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir

Increases in the proton conductivity and selectivity of proton exchange membranes for direct methanol fuel cells by formation of nanocomposites having proton conducting channels

Synthesis and characterization of novel hybrid polysulfone/silica membranes doped with phosphomolybdic acid for fuel cell applications

Contact Info

Product

Resources

About