Abstract
The composite catalyst of crystalline Co(OH)2 modified rare-earth perovskite-type LaNiO3 was synthesized by physical precipitation-sol high temperature calcination method. The ratio between La/Ni and between Co(OH)2/LaNiO3 added presence obvious impact on hydrogen production performance. Under the illumination of the cut-off filter (≥ 420 nm), when the molar ratio between La/Ni is 2:1, the hydrogen production amount at 5 h reached 70.89 μmol. The hydrogen production of Co(OH)2/LaNiO3 under the optimal catalytic conditions was 4.5 times higher than of pure LaNiO3. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) showed good crystallinity of the sample and successful synthesis of the material. TEM and SEM were used to detect the appearance of the catalytic material. The Photoluminescence spectrum (PL), ultraviolet–visible spectroscopy (UV–Vis) and electrochemical workstations were used to characterize the catalytic performance, which is consistent with the hydrogen production results. It is indicated that the bulk Co(OH)2 acts as an electron collector in the catalytic process, which significantly increases the transfer rate of photoelectrons, enhance the hydrogen production performance.
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Acknowledgements
This work was supported by the Natural Science Foundation of Ningxia Province (NZ17262). Open Project of State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University (2019-KF-36); New Catalytic Process in Clean Energy Production (ZDZX201803).
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Mao, M., Xu, J., Zhu, M. et al. Highly efficient catalytic hydrogen production of Co(OH)2-modified rare-earth perovskite LaNiO3 composite under visible light. Appl Nanosci 10, 4361–4374 (2020). https://doi.org/10.1007/s13204-020-01343-9
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Keywords
- LaNiO3
- Co(OH)2
- Catalyst
- Rare earth
- Hydrogen
- Perovskite