Tunable Type I and II heterojunction of CoOx nanoparticles confined in g-C3N4 nanotubes for photocatalytic hydrogen production

[Display omitted] •This work reports tunable heterojunction architectures of CoOx on g-C3N4 nanotubes.•Annealing under vacuum ensured a Type II heterojunction of CoO/C3N4 NTs.•Annealing under air condition led to a Type I heterojunction of Co3O4/C3N4 NTs.•The CoO/C3N4 NTs (7 wt. % of CoO) exhibited...

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