Pt-M (M = Co, Ni, Fe)/g-C3N4复合材料构建及其高效光解水制氢性能

doi:10.3866/PKU.WHXB201907001

Abstract

Abstract:

Platinum (Pt) is recognized as an excellent cocatalyst which not only suppresses the charge carrier recombination of the photocatalyst but also reduces the overpotential for photocatalytic H₂ generation. Albeit of its good performance, the high cost and low abundance restricted the utilization of Pt in large-scale photocatalytic H₂ generation. Pt based transition metal alloys are demonstrated to reveal enhanced activities towards various catalytic reactions, suggesting the possibility to substitute Pt as the cocatalyst. In the present work, Pt was partially substituted with Co, Ni, and Fe and Pt-M (M = Co, Ni, and Fe)/g-C₃N₄ composites were constructed through co-reduction of H₂PtCl₆ and transition metal salts by the reductant of ethylene glycol. The crystal structure and valence states were measured by X-ray diffractometer (XRD) and X-ray photoelectron spectrometer (XPS), respectively. The higher degree of XRD peaks and larger binding energies for Pt 4f_5/2 and Pt 4f_7/2 after incorporating Co²⁺ ions indicated that Co was successfully introduced into the lattice of Pt and Pt-Co bimetallic alloys was attained through the solvothermal treatment. The morphology was subsequently observed by transmission electron microscope (TEM), which showed a good dispersion of Pt-Co nanoparticles on the surface of g-C₃N₄. Meanwhile, the shrinkage of lattice fringe after introducing cobalt salt further confirmed the presence of Pt-Co bimetallic alloys. The UV-Vis absorption spectra of g-C₃N₄ and Pt, Pt-Co deposited g-C₃N₄ were subsequently performed. It was found that the absorption edges were all consistent for all three samples as anticipated, implying that the band gap energy was maintained after hybridizing with Pt or Pt-Co alloys. Furthermore, the photocatalytic H₂ generation was carried out over the as-prepared composites with triethanolamine (TEOA) as sacrificial reagent. Under visible-light illumination, the1% (w) Pt_2.5M/g-C₃N₄ (M = Co, Fe, Ni) composites all exhibited higher or comparable activity towards photocatalytic H₂ generation when compared to 1% (w) Pt loaded counterpart. In addition, the atomic ratios of Pt/Co and the loading amount of Pt-Co cocatalyst were modified to optimize the photocatalytic performance, among which, 1% (w) Pt_2.5Co/g-C₃N₄ composite revealed the highest activity with a 1.6-time enhancement. Electrochemical impedance spectra (EIS) and photoluminescence (PL) spectra indicated that the enhancement might be attributed to improved charge transfer from g-C₃N₄ to Pt_2.5Co cocatalyst and inhibited charge carrier recombination in the presence of Pt_2.5Co cocatalyst. Therefore, the present study demonstrates the great potential to partially replace Pt with low-cost and abundant transition metals and to fabricate Pt based bimetallic alloys as promising cocatalysts for highly efficient photocatalytic H₂ generation.

Key words: Photocatalytic H₂ generation, Composite, Cocatalyst, g-C₃N₄, Pt-Co alloy

MSC2000:

O643

Liang Wang,Chenglu Zhu,Lisha Yin,Wei Huang. Construction of Pt-M (M = Co, Ni, Fe)/g-C₃N₄ Composites for Highly Efficient Photocatalytic H₂ Generation[J].Acta Physico-Chimica Sinica, 2020, 36(7): 1907001.

Figures/Tables 6

References 36

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Construction of Pt-M (M = Co, Ni, Fe)/g-C₃N₄ Composites for Highly Efficient Photocatalytic H₂ Generation

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Construction of Pt-M (M = Co, Ni, Fe)/g-C₃N₄ Composites for Highly Efficient Photocatalytic H₂ Generation