摘要
A simple one-step thermal polymerization method was developed for synthesis of holey graphitic carbon nitride nanotubes,involving direci eating of mixtures of melamine and urea or melamine and cyanuric acid in specific mass ratios.Supramolecular structures formed betweer the precursor molecules guided nanotube formation.The porous and nanotubular structure of the nanotubes facilitated efficient charge carrier nigration and separation,thereby enhancing photocatalytic Hz production in 20 vol.%lactic acid under visible light irradiation.Nanotubes synthesized using melamine and urea in a 1:10 mass ratio(denoted herein as CN-MU nanotubes)exhibited a photocatalytic hydroger production rate of 1,073.6μmol·h^-1·^-g with Pt as the cocatalyst,a rate of 4.7 and 3.1 times higher than traditional Pt/g-CN4 photocatalysts prepared from graphitic carbon nitride(g-CN4)obtained by direct thermal polymerization of melamine or urea,respectively.On the basis of their outstanding performance for photocatalytic H2 production,it is envisaged that the holey g-C3N4 nanotubes will find widespread uptake in other areas,including photocatalytic CO2 reduction,dye-sensitized solar cells and photoelectrochemical sensors.
基金
The authors are grateful for the financial support from the National Key R&D Program of China(Nos.2018YFB1502002,2017YFA0206904,2017YFA0206900,and 2016YFB0600901)
the National Natural Science Foundation of China(Nos.51825205,U1662U&51772305,51572270,21871279,and 21802154)
the Beijing Natural Science Foundation(Nos.2191002,218207&and 2194089)
the Beijing Municipal Science and Technology Project(No.Z181100005118007)
the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB17000000)
the Royal Society-Newton Advanced Fellowship(No.NA170422)
the International Partnership Program of Chinese Academy of Sciences(No.GJHZ1819)and the K.C.Wong Education Foundation.G.I.N.W.acknowledges funding support from the Energy Education Trust of New Zealand and the University of Auckland Faculty Research Development Fund.
