Abstract
Dual-functional catalysis indicates that an organic p–n bilayer induces the catalytic oxidation involved in downhill reactions, not only under illumination but also in the dark. When the organo-bilayer is composed of a perylene derivative (3,4,9,10-perylenetetracarboxylic-bis-benzimidazole (PTCBI), n-type) and cobalt phthalocyanine (CoPc, p-type), only the photocatalytic oxidation of hydrazine (N2H4) occurs. However, the loading of Ag co-catalyst onto the CoPc surface in the PTCBI/CoPc bilayer successfully led to dual catalysis in terms of the oxidation of N2H4 to N2. To develop the present dual catalysis Ag loading was essential to achieve the catalysis performance particularly without irradiation.
Highlights
Studies on photocatalytic reactions have been widely reported
Under irradiation, the thiol oxidation proceeds as demonstrated by the solid-lined pathway, in which the oxidizing power is generated at the cobalt phthalocyanine (CoPc) surface (i.e., CoIIIPc) via a series of photophysical events
Similar to our previous study,[32] PTCBI/CoPc-Nf induced the oxidation of N2H4 only under irradiation (Fig. 1(a))
Summary
Studies on photocatalytic reactions have been widely reported. In addition to the application in uphill reactions with DG > 0 (e.g., water splitting),[1,2,3,4,5] photocatalysts are effectively applied in downhill reactions with DG < 0 (e.g., decomposition of pollutants), when kinetically severe oxidation with large activation energy is involved.[6,7,8,9,10] Among the photocatalysts, TiO2 is recognized to be practically used in the degradation of several types of pollutant.[11,12,13,14,15] the degrading targets are limited to only substances of low concentrations because of the ultraviolet (UV) response of TiO2. By preparing the organo-bilayer modi ed with Ag2O, the dual-functional catalysis for N2H4 oxidation was accomplished. Scheme 1 Illustration of the photoelectrolysis system employed for N2H4 oxidation and chemical structures of PTCBI and CoPc. measurement.
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