{Reference Type}: Journal Article {Title}: Template-free large-scale synthesis of g-C3N4 microtubes for enhanced visible light-driven photocatalytic H2 production {Author}: Zhou, Chao; Shi, Run; Shang, Lu; Wu, Li-Zhu; Tung, Chen-Ho; Tierui, Zhang {Journal}: Nano Research {ISBN/ISSN}: 1998-0124 {Year}: 2018 {Volume}: 11 {Issue}: 6 {Pages}: 3462-3468 {DOI}: 10.1007/s12274-018-2003-2 {Keywords}: water splitting {Keywords}: microtubes {Keywords}: photocatalytic {Keywords}: graphitic carbon nitride (g-C3N4) {Keywords}: visible light response {Abstract}: A template-free hydrothermal-assisted thermal polymerization method has been developed for the large-scale synthesis of one-dimensional (1D) graphitic carbonnitride (g-C3N4) microtubes. The g-C3N4 microtubes were obtained by simple thermal polymerization of melamine-cyanuric acid complex microrods under N2 atmosphere, which were synthesized by hydrothermal treatment of melamine solution at 180 ℃ for 24 h. The as-obtained g-C3N4microtubes exhibited a large surface area and a unique one-dimensional tubular structure, which provided abundant active sites for proton reduction and also facilitated the electron transfer processes. As such, the g-C3N4 microtubes showed enhanced photocatalytic H2 productionactivity in lactic acid aqueous solutions under visible light irradiation (λ ≥ 420 nm), which was ~ 3.1 times higher than that of bulk g-C3N4 prepared by direct thermal polymerization of the melamine precursor under the same calcination conditions. {URL}: https://www.sciopen.com/article/10.1007/s12274-018-2003-2 {Language}: en