To boost the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances, the BiOI/graphitic carbon nitride nanotubes (g-C₃N₄ nanotubes) heterojunction was synthesized herein through the hydrothermal method. BiOI in-situ grew on the surface of g-C₃N₄ nanotubes derived from melamine. The rapid recombination between photoexcited electrons and holes of pristine semiconductors was prevented via building the stable heterojunction. The SEM results indicated that the BiOI was wrapped around the surface of g-C₃N₄ nanotubes, resulting in an optimized electronic transmission pathway. Much lower charge transfer resistance at the p-n heterojunction was demonstrated compared with pristine BiOI according to the EIS results, thus leading to the faster surface reaction rates. Moreover, the composite exhibited both outstanding OER and HER activities under illuminated conditions. This study may shed light upon establishing a bifunctional photoelectrocatalysis for photoelectrochemical water splitting based on stable 2D metal and 1D metal-free nanocomposite.

为了提高析氢反应（HER）和析氧反应（OER）的性能，本文通过水热法合成了BiOI/石墨氮化碳纳米管（gC ₃ N _{4纳米管）异质结。}BiOI在三聚氰胺衍生的gC ₃ N ₄纳米管表面原位生长。通过建立稳定的异质结，可以防止原始半导体的光激发电子和空穴之间的快速复合。SEM结果表明BiOI包裹在gC ₃ N _{4的表面。}纳米管，从而优化了电子传输路径。根据 EIS 结果，与原始 BiOI 相比，pn 异质结处的电荷转移电阻要低得多，从而导致更快的表面反应速率。此外，该复合材料在光照条件下表现出出色的 OER 和 HER 活性。这项研究可能有助于建立基于稳定的二维金属和一维无金属纳米复合材料的光电化学水分解双功能光电催化。