High efficiency photocatalytic hydrogen evolution by black phosphorus quantum dots decorated 1D g-C3N4 nanotubes

Bare g-C 3 N 4 (CN) encounters substantial charge recombination with strong fluorescence, which is detrimental to the photocatalytic reactions. In this work, g-C 3 N 4 is curved into nanotubes then combined with black phosphorus quantum dots (BPQDs). The BPQDs decorated tubular CN (BPTCN) exhibits a stable and high photocatalytic hydrogen evolution rate of 507.51 μmolh −1 g −1 under visible irradiation, which is four times higher than that of pure TCN. The apparent quantum yield (AQY) at 420 nm of BPTCN reaches 2.58%. The excellent photocatalytic ability of the BPTCN is attributed the suppressed recombination of electron-hole pair and improved carrier transport efficiency, which are introduced by the 1D tubular structure and the band alignment of the BPTCN heterojunction.