Graphitic carbon nitride (CN) microtubes doped with potassium were prepared by a hydrothermal reaction of melamine and potassium hydroxide and subsequent calcination at elevated temperature. Both potassium doping and microtube forming increase the specific surface area of 0.20MK-CN to 147.06 m²/g, compared with 28.57 m²/g of CN. The photocurrent and EIS measurements show that K doping promoted the charge separation and migration of 0.20MK-CN photocatalysts. The photocatalytic hydrogen evolution rate for 0.20MK-CN reaches to 11.4 μmol/h, which is 10.8 times that of pure phase CN. The enhanced photocatalytic hydrogen evolution can be ascribed to the enhanced separation and transfer of photoinduced electron/hole pairs for the intraplane heterojunction of CN/K-CN domain.

通过三聚氰胺和氢氧化钾的水热反应，然后在高温下煅烧，制备了掺有钾的石墨化碳纳米管（CN）。与CN的28.57 m ² / g相比，钾掺杂和微管形成均将0.20MK-CN的比表面积增加至147.06 m ² / g 。光电流和EIS测量表明，钾掺杂促进了0.20MK-CN光催化剂的电荷分离和迁移。0.20MK-CN的光催化制氢速率达到11.4μmol/ h，是纯相CN的10.8倍。增强的光催化氢释放可归因于CN / K-CN域的平面内异质结的光诱导电子/空穴对的分离和转移增强。