{"id":77203,"date":"2018-03-09T23:22:40","date_gmt":"2018-03-09T23:22:40","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/preparation-and-characterization-of-proton-exchange-membranes-for-direct-methanol-fuel-cells\/"},"modified":"2018-03-09T23:22:40","modified_gmt":"2018-03-09T23:22:40","slug":"preparation-and-characterization-of-proton-exchange-membranes-for-direct-methanol-fuel-cells","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/quimica\/preparation-and-characterization-of-proton-exchange-membranes-for-direct-methanol-fuel-cells\/","title":{"rendered":"Preparation and characterization of proton exchange membranes for direct methanol fuel cells"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Xiao Zhang <\/strong><\/h2>\n<p>Debido a la crisis de petr\u00f3leo y a los problemas de emisi\u00f3n, las pilas de combustible adquieren un lugar importante en la aplicaci\u00f3n de la energ\u00eda alternativa. Son una clase de dispositivo electroqu\u00edmico que convierte la energ\u00eda qu\u00edmica directamente en energ\u00eda el\u00e9ctrica. Las celdas de combustible de metanol (dmfc) usan membranas de pol\u00edmero como el electrolito; las membranas de pol\u00edmero son capaces de transportar protones de hidr\u00f3geno. El sistema de la celda de combustible todav\u00eda es costoso y las membranas de intercambio de prot\u00f3n han contribuido significativamente para el costo elevado.  actualmente, las membranas de \u00e1cido perfluorosulfonico (pfsa) (por ejemplo, nafion (r), de dupont) ten sido investigadas extensamente. Sin embargo mostraron alto paso de metanol e alto \u00abswelling\u00bb lo que lleva a una eficiencia decelda baja.  el objetivo principal de la tesis es preparar membranas de intercambio de prot\u00f3n nuevas para la aplicaci\u00f3n en dmfc. Membranas compuestas de peg y de pa fueron preparadas. Derivados del \u00e1cido fosf\u00f3rico y lignosulfonados (ls) fueron incluidos en la estructura de la pa para actuar como agentes transportadores de protones. El mecanismo de conductividad de prot\u00f3n es \u00abhopping\u00bb. Ellos mostraron el transporte de metanol m\u00e1s bajo.  se obtuvieron tambi\u00e9n membranas h\u00edbridas de ls, preparadas mediante la mezcla de los dos pol\u00edmeros, ls y psu, siguiendo el m\u00e9todo de precipitaci\u00f3n en inmersi\u00f3n. Las propiedades electroqu\u00edmicas de las membranas de ls fueron determinadas. Las membranas de ls alcanzaron conductividades de prot\u00f3n aceptables (10-20 ms\/cm) con capacidad de intercambio i\u00f3nico muy  baja (iec) (60 veces m\u00e1s baja que nafion). \u00abMembrane electrode assemblies\u00bb (meas) fueron preparadas y sus rendimientos de celda fueron medidos en una celda individual directa de metanol (dmfc).  las membranas de ls son el punto principal de esta tesis. Primero se demostr\u00f3 que ls es un material de intercambio d<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Preparation and characterization of proton exchange membranes for direct methanol fuel cells<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Preparation and characterization of proton exchange membranes for direct methanol fuel cells <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Xiao Zhang <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Rovira i virgili<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 17\/11\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Ricard Garcia Valls<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Juan a Benavente <\/li>\n<li>andreas Gl\u00ed\u00bcsen (vocal)<\/li>\n<li>laura Palacio mart\u00ednez (vocal)<\/li>\n<li>philippe Sistat (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Xiao Zhang Debido a la crisis de petr\u00f3leo y a los problemas de emisi\u00f3n, las pilas de [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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