Chemical doping is an effective strategy for modifying the electrochemical properties of polymeric carbon nitride and tuning its visible-light photocatalytic activity. In this study, chlorine-doped polymeric carbon nitride (Cl-PCN) has been synthesized by the polycondensation method. Among a series of samples, 200Cl-PCN exhibited the best photocatalytic activities for the hydrogen evolution from water splitting. Main aspects were revealed: (i) unique location of Cl atoms at the interlayers of PCN instead of on its π-conjugated planes, (ii) slight band gap narrowing, (iii) lower recombination rate of the electron-hole pairs, and (iv) improved photogenerated charge transport and separation. The above factors affected the 4.4-fold enhancement of photocatalytic efficiency in hydrogen evolution in comparison to the pristine catalyst.
Keywords: polymeric carbon nitride; hydrogen; photocatalysis; doping; chlorine
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Aleksandrzak, M.; Kijaczko, M.; Kukulka, W.; Baranowska, D.; Baca, M.; Zielinska, B.; Mijowska, E. Beilstein Arch. 2021, 20219. doi:10.3762/bxiv.2021.9.v1
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