Platinum Decorated Titanium Dioxide Nanosheets for Efficient Photoelectrocatalytic Hydrogeu Evolution Reaction

doi:10.15541/jim20190009

Abstract

Abstract:

Two kinds of platinum catalysts with different morphologies were prepared by loading platinum atoms on titanium dioxide nanosheets via electrostatic adsorption. Scanning electron microscope (SEM), X-ray powder diffraction (XRD) and transmission electron microscope (TEM) characterization show that the morphology and structure of platinum could be controlled by changing the platinum loading. With low Pt loading (0.2wt%), the platinum atoms were mainly nanoclusters with a radius of about 2 nm. When the Pt loading increased to 1wt%, the platinum atoms stack into nanoparticles on the titanium dioxide nanosheets. The catalytic hydrogen evolution activity of titanium dioxide nanosheets can be improved obviously by regulating the platinum loading and nanostructure. Under AM1.5 solar light, the Tafel slope of both catalysts were less than 100 mV/dec, i.e. 56 and 90 mV/dec, respectively. Compared with TiO₂-Pt1% catalyst, TiO₂-Pt0.2% has a more ideal metal-semiconductor interface, which is favorable for photogenic electrons to migrate to the surface of platinum nanoclusters, and thus perform a higher catalytic activity. This experiment provides a new way for preparing platinum catalysts with high efficiency.

Key words: hydrogen evolution reaction (HER), platinum clusters, titanium dioxide, photoelectrocatalysis

CLC Number:

O643

SU Kun, ZHANG Ya-Ru, LU Fei, ZHANG Jun, WANG Xi. Platinum Decorated Titanium Dioxide Nanosheets for Efficient Photoelectrocatalytic Hydrogeu Evolution Reaction[J]. Journal of Inorganic Materials, 2019, 34(11): 1200-1204.

Figures/Tables 5

Fig. 1 (A) SEM image and (B) XRD patterns of Pt modified TiO2

Fig. 2 HAADF image of (A) TiO2-Pt0.2%, (B) TEM image of TiO2-Pt1%, and the corresponding high-resolution regions (C, D) in (A) and (B), respectively

Fig. 3 (A)i-t curves of pure TNS and TiO2-Pt0.2% under continuous light irradiation or in darkness at -0.2 V external bias; (B) Periodic light irradiation induced i-t curves of pure TNS and TiO2-Pt0.2%

Fig. 4 Nyquist plots of glassy carbon electrode modified with TiO2-Pt0.2% under light irradiation (red curve) and darkness (black curve), mass loading of 0.2 mg/cm in 0.5 mol/L H2SO4

Fig. 5 (A) Linear sweep voltammetry (LSV) curves of glassy carbon electrode modified with pure TiO2-Pt0.2% or TiO2-Pt1% (mass loading of 0.2 mg/cm in 0.5 mol/L H2SO4); (B) corresponding Tafel plots; (C) Proposed schematic route of the photocatalytic process with Pt cluster decorated TiO2 nanosheets as the cathode and graphite rod as the anode

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