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SUMMARY:Biomimetic\, bioinspired and biosynthetic catalysts for water-spli
 tting - Dr Vincent Artero\, CEA\, Grenoble
DTSTART:20130321T160000Z
DTEND:20130321T170000Z
UID:TALK42518@talks.cam.ac.uk
CONTACT:Sian Bunnage
DESCRIPTION:Hydrogen production\, through the reduction of water in electr
 olysers\, is currently one of the most convenient ways to store energy dur
 ably\, if the electrical energy is initially obtained from renewable resou
 rces. However\, while electrolysis is a mature and robust technology\, the
  most promising devices\, based on proton exchange membranes\, relay on th
 e use of platinum as electrocatalyst to accelerate both hydrogen evolution
  and water oxidation reactions. However\, this rare and expensive metal is
  not itself a renewable resource\, so the viability of a hydrogen economy 
 depends on the design of new efficient and robust electrocatalytic materia
 ls based on earth-abundant elements.1  A competitive alternative to platin
 um could be found in living micro-organisms metabolizing hydrogen thanks t
 o hydrogenases. Catalysis in hydrogenases only requires base-metal centers
  (nickel and iron) and we will show how their active sites can be used as 
 an inspiration to design new synthetic catalysts2 and we will present very
  recent results related to the use of these structural mimics for the deve
 lopment of biotechnological processes. We will then present the bio-inspir
 ed approach that we develop for a decade in the lab. We found that cobalt 
 diimine–dioxime complexes are efficient and stable electro-catalysts for
  hydrogen evolution form acidic nonaqueous solutions with slightly lower o
 vervoltages and much larger stabilities towards hydrolysis as compared to 
 previously reported cobaloxime catalysts.3-5 We will report on different a
 pproaches for the covalent functionalization of electrode materials with s
 uch catalysts and their activity under fully aqueous conditions. Their com
 bination with photosensitizers to design photocatalytic systems able to ac
 hieve the photochemical production of hydrogen will also be discussed.6-8\
 n \n\n1.	V. Artero\, M. Chavarot-Kerlidou and M. Fontecave\, Angew. Chem. 
 Int. Ed.\, 2011\, 50\, 7238-7266.\n2.	S. Canaguier\, M. Field\, Y. Oudart\
 , J. Pecaut\, M. Fontecave and V. Artero\, Chem. Commun.\, 2010\, 46\, 587
 6-5878.\n3.	M. Razavet\, V. Artero and M. Fontecave\, Inorg. Chem.\, 2005\
 , 44\, 4786-4795.\n4.	C. Baffert\, V. Artero and M. Fontecave\, Inorg. Che
 m.\, 2007\, 46\, 1817-1824.\n5.	P.-A. Jacques\, V. Artero\, J. Pécaut and
  M. Fontecave\, Proc. Natl. Acad. Sci. U.S.A.\, 2009\, 106\, 20627-20632.\
 n6.	A. Fihri\, V. Artero\, A. Pereira and M. Fontecave\, Dalton Trans.\, 2
 008\, 5567-5569.\n7.	A. Fihri\, V. Artero\, M. Razavet\, C. Baffert\, W. L
 eibl and M. Fontecave\, Angew. Chem. Int. Ed.\, 2008\, 47\, 564-567.\n8.	P
 . Zhang\, P.-A. Jacques\, M. Chavarot-Kerlidou\, M. Wang\, L. Sun\, M. Fon
 tecave and V. Artero\, Inorg. Chem.\, 2012\, 51\, 2115-2120.\n\n
LOCATION:Wolfson Lecture Theatre\, Department of Chemistry
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