{"id":25126,"date":"2015-03-24T16:33:21","date_gmt":"2015-03-24T16:33:21","guid":{"rendered":"http:\/\/blogs.thesocialmedia.com\/leblogenergie\/?p=25126"},"modified":"2015-03-24T16:39:17","modified_gmt":"2015-03-24T16:39:17","slug":"ni5p4-un-phosphure-de-nickel-substitut-possible-au-platine-pour-la-reduction-electrochimique-de-leau","status":"publish","type":"post","link":"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2015\/03\/24\/ni5p4-un-phosphure-de-nickel-substitut-possible-au-platine-pour-la-reduction-electrochimique-de-leau\/","title":{"rendered":"Ni5P4: Un phosphure de nickel substitut possible au Platine pour la r\u00e9duction \u00e9lectrochimique de l’eau"},"content":{"rendered":"

L’\u00e9lectrolyse de l’eau revient \u00e0 la mode comme proc\u00e9d\u00e9 de production d’hydrog\u00e8ne \u00e0 partir de puissance \u00e9lectrique fatale issue d’\u00e9oliennes et cellules photovolta\u00efques install\u00e9es en surnombre et \u00e0 grands frais dans le Nord de l’Europe. Partir de la mol\u00e9cule d’eau, exemplaire pour sa stabilit\u00e9 thermodynamique, pour en extraire l’hydrog\u00e8ne n’est pas forc\u00e9ment un optimum \u00e9nerg\u00e9tique. Mais l’abondance de la ressource, son faible co\u00fbt, la disponibilit\u00e9 de puissance \u00e9lectrique exc\u00e9dentaire peuvent justifier la mise en \u0153uvre de ce proc\u00e9d\u00e9 pour produire de l’hydrog\u00e8ne qui sera inject\u00e9 dans les r\u00e9seaux de gaz naturel ou mis en bouteille, en concurrence avec l’hydrog\u00e8ne issu du reformage du gaz naturel,\u00a0 pour alimenter les nouvelles piles \u00e0 combustible embarqu\u00e9es sur de luxueux et on\u00e9reux v\u00e9hicules de transport terrestre nippons ou cor\u00e9ens (en attendant les copies europ\u00e9ennes toujours en retard) . Cette \u00e9lectrolyse de rattrapage n’est pas la r\u00e9volution \u00e9nerg\u00e9tique claironn\u00e9e par certains baratineurs qui vous titillent l’\u00e9motion, c’est tout au plus un proc\u00e9d\u00e9 marginal de r\u00e9cup\u00e9ration partielle d’\u00e9nergie renouvelable disponible en exc\u00e8s.<\/p>\n

Une des cl\u00e9s de la ma\u00eetrise de la r\u00e9action d’\u00e9lectrolyse de l’eau\u00a0 repose sur celle de la r\u00e9action d’\u00e9volution d\u2019hydrog\u00e8ne (HER pour les am\u00e9ricains). En effet sur bien des \u00e9lectrodes de diverses natures la r\u00e9action de r\u00e9duction de l’eau donne lieu \u00e0 des ph\u00e9nom\u00e8nes de surtensions importantes, et donc \u00e0 des pertes d’\u00e9nergie sous forme de chaleur\u00a0 qui d\u00e9gradent le bilan \u00e9nerg\u00e9tique de l’op\u00e9ration. Le m\u00e9tal id\u00e9al pour r\u00e9aliser la r\u00e9duction de la mol\u00e9cule d’eau est le platine dont le d\u00e9faut essentiel est constitu\u00e9 dans ce cas par son prix.<\/p>\n

Toute avanc\u00e9e dans la recherche de substituts au platine, que ce soit dans l’\u00e9lectrolyse de l’eau ou dans les piles \u00e0 combustible, on parle alors dans ce cas d’oxydation d’hydrog\u00e8ne, pr\u00e9sente un int\u00e9r\u00eat majeur dans le mouvement de d\u00e9mocratisation de ces technologies complexes et on\u00e9reuses.<\/p>\n

A ce titre les courbes intensit\u00e9-potentiel de r\u00e9duction de l’eau,\u00a0 pr\u00e9sent\u00e9es r\u00e9cemment\u00a0 par Brian Scheid sur une \u00e9lectrode de phosphure de nickel Ni5P4<\/strong>, compar\u00e9es \u00e0 celles obtenues sur \u00e9lectrode de platine sont particuli\u00e8rement impressionnantes (FIG.).<\/p>\n

\"\"<\/a><\/p>\n

ACCEDER au papier concernant cette nouvelle<\/a>.<\/p>\n

 <\/p>\n

Le 24 Mars 2015<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

L’\u00e9lectrolyse de l’eau revient \u00e0 la mode comme proc\u00e9d\u00e9 de production d’hydrog\u00e8ne \u00e0 partir de puissance \u00e9lectrique fatale issue d’\u00e9oliennes et cellules photovolta\u00efques install\u00e9es en surnombre et \u00e0 grands frais dans le Nord de l’Europe. Partir de la mol\u00e9cule d’eau, exemplaire pour sa stabilit\u00e9 thermodynamique, pour en extraire l’hydrog\u00e8ne n’est pas forc\u00e9ment un optimum \u00e9nerg\u00e9tique. […]<\/p>\n","protected":false},"author":341,"featured_media":25136,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-25126","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nNi5P4: Un phosphure de nickel substitut possible au Platine pour la r\u00e9duction \u00e9lectrochimique de l'eau - leblogenergie.com<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.thesocialmedia.com\/leblogenergie\/2015\/03\/24\/ni5p4-un-phosphure-de-nickel-substitut-possible-au-platine-pour-la-reduction-electrochimique-de-leau\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Ni5P4: Un phosphure de nickel substitut possible au Platine pour la r\u00e9duction \u00e9lectrochimique de l'eau - leblogenergie.com\" \/>\n<meta name=\"twitter:description\" content=\"L’\u00e9lectrolyse de l’eau revient \u00e0 la mode comme proc\u00e9d\u00e9 de production d’hydrog\u00e8ne \u00e0 partir de puissance \u00e9lectrique fatale issue d’\u00e9oliennes et cellules photovolta\u00efques install\u00e9es en surnombre et \u00e0 grands frais dans le Nord de l’Europe. 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