**4.3 Boron doping**

Thaweesak et al. [20] used one-pot thermal condensation to create a novel form of boron-doped graphitic carbon nitride nanoscale material. The best time catalytic hydrogen evolution activity is reported to be 1880 mol g−1 h−1 (> 400 nm), which is more than 12 times greater than bulk g-C3N4. The combination of band structure development and morphological control is credited with the strong photocatalytic performance. He et al. [21] successfully doped boron into a line-shaped carbon nitride photocatalytic material using sodium borohydride corrosion. The photocatalytic performance was successfully improved. Boron doping not only narrows the band gap and absorbs more visible light, but it also has a larger surface area than bulk g-C3N4, improving photocatalytic activity significantly. These works show two different preparation tactics that work together.
