Abstract
The synthesis of two random copolymers was carried out by radical copolymerization. Poly(styrene-co-acrylic acid) in a 94:6 (St:AA) molar ratio, partially cross-linked with trimethylol propane trimethacrylate was synthesized by mass polymerization and then sulfonated (PSAAS-m) with sulfuric acid. On the other hand, the same random PSAA was synthesized by solution polymerization, but cross-linked with divinylbenzene and then sulfonated (PSAAS-s). Copolymers, including non sulfonated controls, were dissolved in THF and used to coat a platinum (Pt) electrode by “deep coating” and studied electrochemically by the voltamperometric cycle technique in 0.5 M H2SO4. Both non-sulfonated PSAA copolymers showed only a baseline signal, indicating no proton conductivity through them. The same result was obtained for the PSAAS-s copolymer, suggesting no proton conductivity as well. On the contrary, the copolymer synthesized in mass and highly sulfonated (PSAAS-m) showed the corresponding signals of Pt reduction, similar to the experiment carried out for the Pt electrode without any coating. Ion exchange capacity and water uptake measurements support the electrochemical findings.
References
Wang C, van der Vliet D, More KL, Zaluzec NJ, Peng S, Sun S, Daimon H, Wang G, Greeley J, Pearson J, Paulikas AP, Karapetrov G, Strmcnik D, Markovic NM, Stamenkovic VR (2011) Multimetallic Au/FePt3 nanoparticles as highly durable electrocatalyst. Nano Lett 11:919–926
Du B, Guo Q, Pollard R, Rodriguez D, Smith C, Elter J (2006) PEM fuel cells: status and challenges for commercial stationary power applications. JOM 58:45–49
Hickner MA, Ghassemi H, Kim YS, Einsla BR, McGrath JE (2004) Alternative polymer systems for proton exchange membranes (PEMs). Chem Rev 104:4587–4611
Daletou MK, Kallitsis J, Neophytides SG (2011) Interfacial phenomena in electrocatalysis. Springer, New York
Smitha B, Sridhar S, Khan AA (2005) Solid polymer electrolyte membranes for fuel cell applications—a review. J Memb Sci 259:10–26
da Silva L, da Silva FE, Franco CV, Nuernberg RB, Gomes T, Miranda R, Paula MMS (2009) Humidity and pH sensor based on sulfonated poly-{styrene–acrylic acid} polymer. Mater Sci Eng, C 29:599–601
Oenning LW, Entrecruzamiento (2012) sulfonación e incorporación de nanopartículas metálicas en membranas de poli (estireno-co-ácido acrílico) y su implicación en celdas de combustible. Dissertation, Centro de Investigación en Química Aplicada
Benavides R, Oenning L, Paula MMS, da Silva L (2014) Properties of polystyrene/acrylic acid membranes after sulphonation reactions. J New Mater Electrochem Syst 17:085–090
Luo Q, Zhang H, Chen J, Qian P, Zhai Y (2008) Modification of nafio membrane using interfacial polimerization for vanadium redox flow battery applications. J Memb Sci 311:98–103
Suarez-Alcantara K, Solorza-Feria O (2010) Reacción de reducción de oxígeno. In: Rodriguez-Varela FJ, Solorza-Feria O, Hernández-Pacheco E (eds) Celdas de combustible. SMH, Ottawa, pp 47–68
Lim BR, Kim JW, Hwang SJ, Yoo SJ, Cho EA, Lim TH, Kim SK (2010) Fabrication and characterization of high-activity Pt/C electrocatalysts for oxygen reduction. Bull Korean Chem Soc 31:1577–1582
Melo L, Benavides R, Martínez G, da Silva L, Paula MMS (2014) Degradation side reactions during sulphonation of poly(styrene-acrylic acid) used as membranes. Polym Deg Stab 109:343–352
Angulo G, Kapturkiewicz A, Palmaerts A, Lutsen L, Cleij TJ, Vanderzande D (2009) Cyclic voltammetry studies of n-type polymers with non-alternant fluoranthene units. Electrochim Acta 54:1584–1588
Conway BE, Angerstein-Kozlowska H, Sharp WBA, Criddle EE (1973) Ultrapurification of water for electrochemical and surface chemical work by catalytic pyrodistillation. Anal Chem 45:1331–1336
Zhou S, Hai SD, Kim D (2012) Cross-linked poly(arylene ether ketone) proton exchange membranes with high ion exchange capacity for fuel cells. Fuel Cell 12:589–598
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The Consejo Nacional de Ciencia y Tecnología (CONACyT-México) is greatly acknowledged for the finance of this project.
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Benavides, R., Rodriguez, J.C.O., Melo, L. et al. Electrochemical comparison of two sulfonated styrene PEM membranes synthesized by different methods. J Appl Electrochem 45, 1211–1215 (2015). https://doi.org/10.1007/s10800-015-0877-1
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DOI: https://doi.org/10.1007/s10800-015-0877-1