Engineering the multi-hetero-junctions in semiconductor photocatalysts has been recognized as a promising way to achieve highly efficient photocatalytic solar-fuel generation, because the photoinduced heterointerfacial charge transfer can greatly hinder the recombination process of charge-carrier in photocatalysts. In this work, we fabricated copper species nanocrystals/TiO₂ multi-hetero-junction photocatalysts through in situ reduction of CuO nanocrystals in CuO/TiO₂ electrospun nanofibers by a hydrothermal method assisted by glucose. By changing the concentration of glucose, the composition ratio of copper species nanocrystals, including CuO, Cu₂O, and Cu, can be adjusted in multi-hetero-junction nanofibers. Upon simulated sunlight irradiation, the optimal copper species nanocrystals/TiO₂ multi-hetero-junction nanofibers exhibited an H₂ evolution rate of ∼10.04 μmol h^–1, a 17.3 times increase over that of bare TiO₂ nanofibers (∼0.57 μmol h^–1).

中文翻译：

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TiO ₂电纺纳米纤维中铜物种纳米晶体的原位生成：高效减水的多异质结光催化剂

在半导体光催化剂中工程化多异质结已被公认为是实现高效光催化太阳能燃料产生的有前途的方法，因为光诱导的异质界面电荷转移会大大阻碍光催化剂中载流子的重组过程。在这项工作中，我们通过葡萄糖辅助水热法原位还原CuO / TiO ₂电纺纳米纤维中的CuO纳米晶体，从而制备了铜物种纳米晶体/ TiO ₂多异质结光催化剂。通过改变葡萄糖的浓度，可以得到包括CuO，Cu ₂在内的铜纳米粒子的组成比O和Cu可以在多异质结纳米纤维中进行调节。在模拟阳光照射下，最佳的铜物种纳米晶体/ TiO ₂多异质结纳米纤维的H ₂析出速率为〜10.04μmolh ^–1，比裸露的TiO ₂纳米纤维（〜0.57μmolh ^{– 1}）。