We report a Cu₂O/CdS/ZnO photoanode constructed by coupling Cu₂O and CdS nanoparticles on ZnO nanotube arrays (NTAs) via combining chemical bath deposition with successive ionic-layer adsorption and reaction. Integrating the merits of the superior ability of Cu₂O and CdS to harvest visible light, dual heterojunctions, type-II band structure, a p-n junction, and ordered tubular structure, the photoanode exhibits simultaneous significant improvements in the visible light absorption, charge separation, hydrogen generation, and stability. At 0.4 V versus Ag/AgCl under AM 1.5 G irradiation, the photoanode achieves a photocurrent density of 7 mA/cm², which is 2.3-fold higher than that of CdS/ZnO heterojunction NTAs. Furthermore, under AM 1.5 G illumination without bias potential, the photoanode achieves an average hydrogen generation rate of 134 μmol/h, which is 1.5 times that of single-heterojunction CdS/ZnO NTAs. The highest solar-to-hydrogen conversion efficiency of the Cu₂O/CdS/ZnO photoanode is 2.8% at 0.6 V vs. RHE, 1.6 times that of the CdS/ZnO NTAs.

中文翻译：

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双异质结Cu ₂ O / CdS / ZnO纳米管阵列光电阳极，用于高效光电化学太阳能驱动的氢气生产，效率为2.8％

我们报告通过结合化学浴沉积与连续的离子层吸附和反应相结合的耦合在ZnO纳米管阵列（NTA）上的Cu ₂ O和CdS纳米粒子构造的Cu ₂ O / CdS / ZnO光电阳极。结合了Cu ₂ O和CdS的优异能力来收集可见光，双重异质结，II型能带结构，pn结和有序管状结构的优点，光阳极在可见光吸收，电荷分离方面显示出显着的同时改进，氢气产生和稳定性。在AM 1.5 G辐射下，相对于Ag / AgCl为0.4 V时，光阳极的光电流密度为7 mA / cm ²，比CdS / ZnO异质结NTA高2.3倍。此外，在没有偏置电势的AM 1.5 G照明下，光阳极的平均氢气产生速率为134μmol/ h，是单异质结CdS / ZnO NTA的1.5倍。Cu ₂ O / CdS / ZnO光电阳极在0.6 V vs. RHE下的最高太阳能转化效率为2.8％，是CdS / ZnO NTA的1.6倍。