Cuboidal Cu 2 O nanoparticles dispersed granular Mn 0. 05 Cd 0 . 95 S form a p‐n heterojunction for efficient photocatalytic hydrogen evolution

Summary In this work, n‐type semiconductor Mn 0.05 Cd 0.95 S (MCS) nanoparticles are closely glued to the surface of p‐type semiconductor Cu 2 O nanocubes, which increasing the contact area between them and presenting a more uniform distribution. And a Cu 2 O/Mn 0.05 Cd 0.95 S p‐n heterojunction was formed, thus, a p‐n interface is constructed at the surface of MCS nanoparticles and Cu 2 O nanocubes, where the internal electric field drives the transfer of photogenerated electrons, so that high‐efficiency prevents the combination of photogenerated electron‐hole pairs. Here, under the premise that Na 2 S/Na 2 SO 3 (0.35 M/0.25 M) solution is used as a sacrificive reagent, Hydrogen production experiments have confirmed this 5%Cu 2 O/Mn 0.05 Cd 0.95 S photocatalyst exhibits the highest photocatalytic hydrogen production activity of 468.3 μmol, which is approximate 2.8 times higher than that of pure MCS nanoparticles. Moreover, a high photostability was also obtained over 5%Cu 2 O/Mn 0.05 Cd 0.95 S photocatalyst. This discovery proves a facile method to construct Cu 2 O/Mn 0.05 Cd 0.95 S p‐n heterojunction for highly efficient visible‐light photocatalytic hydrogen evolution.