Synthesis of Holey Graphitic Carbon Nitride with Highly Enhanced Photocatalytic Reduction Activity via Melamine-cyanuric Acid Precursor Route

Abstract

In this work, holey graphitic carbon nitride(HCN) was prepared by one-step thermal polymerization of hydrothermal product of melamine and then loaded with Ni/MoO₂(NiMo) cocatalyst obtained by NaBH₄ reduction process. The obtained material was used for photocatalytic production of H₂ from water reduction and H₂O₂ production from O₂ reduction. The best photocatalyst(l% NiMo/HCN) exhibited a H₂ evolution rate of 8.08 Omol/h while no H₂ was detected over 1% NiMo-modifed bulk g-C₃N₄(BCN) under visible light illumination. Moreover, this rate is 1.7 times higher than that of 1% Pt-modified HCN. The 1% NiMo/HCN catalyst also exhibited the highest H₂O₂ production activity with a value of 6.13 μmol/h. Such enhancement was ascribed to the efficient charge carrier separation and migration, which were promoted by the large specific surface area and pore volume of HCN and the synergy between MoO₂ and Ni. The proposed method to obtain HCN is expected to open up new ways in development of highly-active HCN-based photocatalysts for photocatalytic reduction reactions.

Keywords

Holey g-C₃N₄ / Ni/MoO₂ nanoparticle / Photocatalysis / H₂ evolution / H₂O₂ production

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