Facile Synthesis of Au/g‐C₃N₄ Nanocomposites: An Inorganic/Organic Hybrid Plasmonic Photocatalyst with Enhanced Hydrogen Gas Evolution Under Visible‐Light Irradiation

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Noble‐metal Au nanoparticles deposited on graphitic carbon nitride polymer (g‐C 3 N 4 ) photocatalyst by a facile deposition–precipitation method exhibited high photocatalytic activity for hydrogen gas production under visible‐light irradiation. The Au/g‐C 3 N 4 nanocomposite plasmonic photocatalysts were characterized by X‐ray diffraction spectroscopy, diffuse reflectance UV/Vis spectroscopy, FTIR spectroscopy, field‐emission scanning electron microscopy, high‐resolution transmission electron microscopy, selected‐area electron diffraction, X‐ray photoelectron spectroscopy, photoluminescence spectroscopy, and photoelectrochemical measurements. We studied the effect of Au deposition on the photocatalytic activity of g‐C 3 N 4 by investigation of optical, electronic, and electrical properties. Enhanced photocatalytic activity of Au/g‐C 3 N 4 naocomposite for hydrogen production was attributed to the synergic mechanism operating between the conduction band minimum of g‐C 3 N 4 and the plasmonic band of Au nanoparticles including high optical absorption, uniform distribution, and nanoscale particle size of gold. The mechanism of te photocatalytic activity of the nanocomposite photocatalyst is discussed in detail. Deposition of Au nanoparticles on g‐C 3 N 4 was optimized and it was found that 1 wt % Au‐loaded g‐C 3 N 4 composite plasmonic photocatalyst generated a photocurrent density of 49 mA cm −2 and produced a hydrogen gas amount of 532 μmol under visible light, which were more than 3000 times higher and 23 times higher, respectively, than the values of neat g‐C 3 N 4 .