Carbon black metal-coordination complex

Carbon monosulfide [2944-05-0] CS, is an unstable gas produced by the decomposition of carbon disulfide at low pressure ia a silent electrical discharge or photolyticaHy (1 3) ia the presence or absence of sulfur (3). It decomposes with a half-life of seconds or minutes to a black soHd of uncertain composition (1—3). The monosulfide can be stabilized ia a CS2 matrix at — 196°C, and many stable coordination complexes of CS with metals have been prepared by iadirect means (8). 

Pyrolysis of macrocyclic precursors has been shown in some cases to yield more active and stable catalysts for instance, pyrolysis of a mixture of Fe and Cu phthalocyanine-based complexes on carbon black produces a catalyst with 4-electron ORR activity higher than Pt/C at potentials lower than 0.84 V (RHE) in RDE experiments [13]. Such pyrolyzed macrocycle catalysts contain nitrogen coordinated to metal atoms, as well as nitrogen in CxNy compounds in which nitrogen is not coordinated to any metal. While the central importance of nitrogen to such catalysts is widely attested, the complex heterogeneous nature of these catalysts has thus far prevented any consensus on the identity of the ORR active site(s). Similarly, pyrolysis of Fe... 

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