Citation: Yang Yang, Yan-Xin Chen, Ao-Sheng She, Hao-Yan Shi, Wen Chen, Wei Wang, Hai-Long Wang, Ke-Xian Li, Yi-Hu Pu, Wei-Hua Yang, Xiu-Mei Lin, Can-Zhong Lu. Nickel phosphide modified TiO2 nanotube arrays for efficient PEC water splitting H2 generation[J]. Chinese Journal of Structural Chemistry, ;2025, 44(7): 100623. doi: 10.1016/j.cjsc.2025.100623 shu

Nickel phosphide modified TiO2 nanotube arrays for efficient PEC water splitting H2 generation

Photoelectrochemical (PEC) hydrogen production holds great promise for applications in energy production. A novel strategy characterized by simplicity, stability, and high efficiency is developed to significantly boost the PEC performance of TiO2 (anatase) nanotube arrays (TNTAs). This strategy entails a series of treatments, including a conventional anodic oxidation (etching) process, a primary annealing treatment, and a secondary annealing treatment via impregnation. As a result, nickel phosphide (Ni2P) is composited onto well-ordered titanium dioxide (anatase) nanotube array photoanodes (Ni2P/TNTAs), which exhibit hugely improved PEC H2 generation performance. A thorough and systematic investigation is conducted to comprehensively analyze the morphology, semiconductor band-gap structure, and PEC H2 production performance of the Ni2P/TNTAs composites. The experimental results demonstrate that under identical experimental circumstances, the measured photocurrent density of the Ni2P/TNTAs photoanode exhibits a 6.63-fold increase relative to that of TNTAs. The H2 production rate of Ni2P/TNTAs reaches 182.96 μmol/cm2, 6.10 times higher than that of pure TNTAs. The excellent interfacial charge transfer pathway at the Ni2P/TiO2 interface promotes photogenerated carrier separation and electron transfer from TiO2 to Ni2P. This method offers a valuable reference for designing highly efficient PEC H2-production catalysts.
- TiO2 nanotube arrays,
- Heterojunction,
- Photoelectrochemical water splitting,
- Visible-light response,
- Nickel-based catalyst
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