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SUMMARY:Bridging Molecular and Heterogeneous Electrocatalysis Through Grap
 hite Conjugation - Prof. Yogesh Surendranath\, MIT\, Cambridge\, USA
DTSTART:20180625T140000Z
DTEND:20180625T150000Z
UID:TALK106516@talks.cam.ac.uk
CONTACT:Dr. Erwin Reisner
DESCRIPTION:The efficient interconversion of electrical and chemical energ
 y requires catalysts capable of accelerating complex multi-electron reacti
 ons at electrified interfaces. These reactions can be carried out at the m
 etallic surface sites of heterogeneous electrocatalysts or via redox media
 tion at molecular electrocatalysts. Molecular catalysts yield readily to s
 ynthetic alteration of their redox properties and secondary coordination s
 phere\, permitting systematic tuning of their activity and selectivity. Si
 milar control is difficult to achieve with heterogeneous electrocatalysts 
 because they typically exhibit a distribution of active site geometries an
 d local electronic structures\, which are recalcitrant to molecular-level 
 synthetic modification. However\, metallic heterogeneous electrocatalysts 
 benefit from a continuum of electronic states which distribute the redox b
 urden of a multi-electron transformation\, enabling more efficient catalys
 is. We have developed a simple synthetic strategy for conjugating well-def
 ined molecular catalyst active sites with the extended states of graphitic
  solids. Electrochemical and spectroscopic data indicate that these graphi
 te-conjugated catalysts do not behave like their molecular analogues\, but
  rather as metallic active sites with molecular definition\, providing a u
 nique bridge between the traditionally disparate fields of molecular and h
 eterogeneous electrocatalysis.
LOCATION:Unilever Lecture Theatre\, Department of Chemistry\, Lensfield Ro
 ad\, Cambridge
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