{"id":3869,"date":"2025-05-25T10:30:00","date_gmt":"2025-05-25T08:30:00","guid":{"rendered":"https:\/\/www.svalbard.fr\/actualites\/?p=3869"},"modified":"2025-05-23T13:24:18","modified_gmt":"2025-05-23T11:24:18","slug":"une-avancee-scientifique-multiplie-par-1000-la-production-dhydrogene-grace-a-un-metal-banal","status":"publish","type":"post","link":"https:\/\/www.svalbard.fr\/actualites\/une-avancee-scientifique-multiplie-par-1000-la-production-dhydrogene-grace-a-un-metal-banal\/","title":{"rendered":"Une avanc\u00e9e scientifique multiplie par 1000 la production d\u2019hydrog\u00e8ne gr\u00e2ce \u00e0 un m\u00e9tal banal"},"content":{"rendered":"\n<p><strong><em>Imaginez pouvoir produire de l\u2019<\/em><\/strong><strong><em>hydrog\u00e8ne vert<\/em><\/strong><strong><em> sans d\u00e9pendre de m\u00e9taux rares ni de carburants fossiles, simplement en rempla\u00e7ant un composant cl\u00e9 par un mat\u00e9riau courant. C\u2019est la promesse d\u2019une \u00e9quipe japonaise qui a frapp\u00e9 fort avec un catalyseur \u00e0 base d\u2019<\/em><\/strong><strong><em>oxyde de manganese<\/em><\/strong><strong><em>.<\/em><\/strong><\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">Un balzo in avanti nell\u2019elettrolisi de l\u2019eau<\/h2>\n\n\n\n<p>Au RIKEN CSRS de Yokohama, le professeur Ryuhei Nakamura et son \u00e9quipe ont mis au point un proc\u00e9d\u00e9 r\u00e9volutionnaire. En r\u00e9arrangeant la structure tridimensionnelle de leur catalyseur, ils ont non seulement multipli\u00e9 par <strong>1000 la dur\u00e9e de vie et l\u2019activit\u00e9<\/strong> de la r\u00e9action d\u2019\u00e9lectrolyse, mais aussi d\u00e9gag\u00e9 de l\u2019<a href=\"https:\/\/www.svalbard.fr\/actualites\/lespagne-devoile-un-generateur-dhydrogene-100-renouvelable-qui-etonne-le-monde-entier\/\"><strong>hydrog\u00e8ne<\/strong><\/a> \u00e0 un rythme in\u00e9gal\u00e9. Lors de leurs essais, le syst\u00e8me a maintenu une densit\u00e9 de courant de 1000 mA\/cm\u00b2 pendant un mois, un niveau jamais atteint auparavant.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La sfida des m\u00e9taux rares et une solution innovante<\/h2>\n\n\n\n<p>Jusqu\u2019ici, l\u2019\u00e9lectrolyse \u00e0 membrane \u00e0 \u00e9change de protons (PEM) d\u00e9pendait d\u2019iridium, m\u00e9tal dont la production mondiale suffirait \u00e0 peine \u00e0 satisfaire un d\u00e9ploiement \u00e0 l\u2019\u00e9chelle <strong>terawatt<\/strong>. Cette p\u00e9nurie menace le d\u00e9ploiement de l\u2019hydrog\u00e8ne vert. Pour contourner cet obstacle, les chercheurs ont remplac\u00e9 l\u2019iridium par un <strong>mangan\u00e8se<\/strong> abondant, transformant un m\u00e9tal banalis\u00e9 en atout majeur pour la transition \u00e9nerg\u00e9tique.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La svolta con l\u2019oxyde de manganese<\/h2>\n\n\n\n<p>Le secret r\u00e9side dans l\u2019<strong>oxyde de MnO\u2082<\/strong> modifi\u00e9 : en augmentant la proportion d\u2019<strong>oxyg\u00e8ne plan<\/strong> dans son r\u00e9seau, le catalyseur gagne en stabilit\u00e9 sans perdre en activit\u00e9. Cette configuration unique permet \u00e0 l\u2019\u00e9lectrode de r\u00e9sister aux conditions acides du proc\u00e9d\u00e9 tout en restant hautement r\u00e9active, une double performance rarement observ\u00e9e.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tests et r\u00e9sultats prometteurs<\/h2>\n\n\n\n<p>Lors de tests sous PEM, l\u2019\u00e9lectrolyse a tourn\u00e9 pendant six semaines \u00e0 200 mA\/cm\u00b2, produisant dix fois plus d\u2019hydrog\u00e8ne qu\u2019avec d\u2019autres catalyseurs sans m\u00e9taux pr\u00e9cieux. Cette <strong>efficacit\u00e9 am\u00e9lior\u00e9e<\/strong> sans compromis sur la durabilit\u00e9 ouvre la voie \u00e0 une production d\u2019hydrog\u00e8ne comp\u00e9titive et r\u00e9ellement <strong>durable<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vers un futur sur hydrog\u00e8ne<\/h2>\n\n\n\n<p>M\u00eame si des tests \u00e0 l\u2019\u00e9chelle industrielle restent \u00e0 confirmer, cette d\u00e9couverte est d\u00e9j\u00e0 salu\u00e9e par des experts de l\u2019Agence internationale de l\u2019\u00e9nergie et du Hydrogen Council. En rempla\u00e7ant l\u2019iridium par un catalyseur \u00e0 base de mangan\u00e8se, on r\u00e9duit \u00e0 la fois le co\u00fbt et l\u2019empreinte \u00e9cologique de l\u2019<strong><a href=\"https:\/\/www.svalbard.fr\/actualites\/la-chine-deploie-le-plus-grand-electrolyseur-alcalin-du-monde-capable-de-produire-4000-tonnes-dhydrogene-annuellement\/\">\u00e9lectrolyse<\/a><\/strong>. Une r\u00e9volution qui pourrait acc\u00e9l\u00e9rer la diffusion de l\u2019hydrog\u00e8ne dans le mix \u00e9nerg\u00e9tique mondial.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Imaginez pouvoir produire de l\u2019hydrog\u00e8ne vert sans d\u00e9pendre de m\u00e9taux rares ni de carburants fossiles, simplement en rempla\u00e7ant un composant cl\u00e9 par un mat\u00e9riau courant.<\/p>\n","protected":false},"author":3,"featured_media":3870,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1725],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Une avanc\u00e9e scientifique multiplie par 1000 la production d\u2019hydrog\u00e8ne gr\u00e2ce \u00e0 un m\u00e9tal banal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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