Here, we report a novel β-Ni(OH)₂@CdS shell-core nanorod array (NRA) photoanode with prolonged lifetime for highly efficient H₂ generation. The fabricated photoanode shows drastically enhanced ability to generate H₂ from water splitting under bias-free visible light irradiation. The H₂ production rate of β-Ni(OH)₂@CdS NRA photoelectrode reaches 762.5 μmol h^-1, 8 times as high as that of pure CdS NRA photoelectrode. In addition, the constructed β-Ni(OH)₂@CdS shell-core NRA photoanode exhibits an outstanding stability. Mott-Schottky measurements clearly demonstrate that both p-n junction and type-II band alignment are established at β-Ni(OH)₂ and CdS interface. This unique band structure is highly favorable for the transfer and separation of charge carriers, significantly suppressing charge recombination, as confirmed by photoluminescence emission study. Moreover, the measurements of electrochemical spectroscopy undoubtedly confirm that the lifetime of charge carriers within this unique band structure is significantly prolonged, leading to drastically enhanced photoelectrochemical water splitting for H₂ generation.

在这里，我们报告一种新型的β-Ni（OH）₂ @CdS壳核纳米棒阵列（NRA）光阳极，具有延长的寿命，可高效生成H ₂。所制造的光阳极显示出在无偏压可见光照射下由水分解产生H _2的能力大大增强。β-Ni（OH）₂ @CdS NRA光电极的H ₂产生速率达到762.5μmolh ^-1，是纯CdS NRA光电极的8倍。此外，构造的β-Ni（OH）₂ @CdS壳核NRA光电阳极具有出色的稳定性。Mott-Schottky测量清楚地表明pn结和II型能带对准均建立在β-Ni（OH）_2处和CdS接口。如光致发光发射研究所证实的，这种独特的能带结构对电荷载流子的转移和分离非常有利，从而显着抑制了电荷复合。此外，电化学光谱的测量无疑证实了该独特的能带结构内的载流子的寿命大大延长，从而导致用于H ₂生成的光电化学水分解显着增强。