title: Graphite-Conjugated Pyrazines as Molecularly Tunable Heterogeneous Electrocatalysts.
abstract: Condensation of ortho-phenylenediamine derivatives with ortho-quinone moieties at edge planes of graphitic carbon generates graphite-conjugated pyrazines (GCPs) that are active for oxygen reduction electrocatalysis in alkaline aqueous electrolyte. Catalytic rates of oxygen reduction are positively correlated with the electrophilicity of the active site pyrazine unit and can be tuned by over 70-fold by appending electron-withdrawing substituents to the phenylenediamine precursors. Discrete molecular analogs containing pyrazine moieties display no activity above background under identical conditions. This simple bottom up method for constructing molecularly well-defined active sites on ubiquitous graphitic solids enables the rational design of tunable heterogeneous catalysts.
authors: Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors: Tomohiro
authors: T
authors: Fukushima
authors: Walter
authors: W
authors: Drisdell
authors: Junko
authors: J
authors: Yano
authors: Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.
authors: Yogesh
authors: Y
authors: Surendranath
mesh_terms: D002384:Catalysis; D055664:Electrochemical Techniques; D006108:Graphite / Q000737:chemistry*; D015394:Molecular Structure; D011719:Pyrazines / Q000737:chemistry*
chemical_list: D011719:Pyrazines; D006108:Graphite