Chinese Journal of Catalysis ›› 2023, Vol. 51: 113-123.DOI: 10.1016/S1872-2067(23)64469-9
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Wei Qiaoa, Lice Yua, Jinfa Changb, Fulin Yanga, Ligang Fenga,*()
Received:
2023-04-28
Accepted:
2023-06-05
Online:
2023-08-18
Published:
2023-08-31
Contact:
*E-mail: ligang.feng@yzu.edu.cn, fenglg11@gmail.com (L. Feng).
Supported by:
Wei Qiao, Lice Yu, Jinfa Chang, Fulin Yang, Ligang Feng. Efficient bi-functional catalysis of coupled MoSe2 nanosheet/Pt nanoparticles for methanol-assisted water splitting[J]. Chinese Journal of Catalysis, 2023, 51: 113-123.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64469-9
Fig. 1. SEM image of MoSe2 (a) and Pt/MoSe2 (b). TEM (c,d) and HRTEM (e) images and the corresponding SAED pattern (f), EDS spectra (g), STEM image (h) and corresponding elemental mapping images (i?k) and overlap image (l) of Pt/MoSe2 catalyst.
Fig. 2. (a) XRD patterns of Pt/MoSe2, PtMo/C and Pt/C. (b) Pt 4f XPS spectra of the Pt/MoSe2, PtMo/C and Pt/C. (c) Mo 3d spectra for Pt/MoSe2 and PtMo/C. (d) Se 3d spectrum for Pt/MoSe2.
Fig. 3. (a) CV curves of Pt/MoSe2, PtMo/C, Pt/C and MoSe2 catalysts. (b) The graphical comparison of peak current density after different scan cycles, CA curves (c), CO stripping curves (d), and the graphical comparison of mass and specific activity (e) of Pt/MoSe2, PtMo/C and Pt/C catalysts.
Fig. 4. (a) CV curves of the Pt/MoSe2 catalyst recorded at scan rates of 5 mV to 150 mV s-1. (b) The corresponding plot of different catalysts with forward peak current density as a function of the square root of the scan rate (v1/2). (c) Nyquist plots of different catalysts. (d) The in situ FTIR spectra of Pt/MoSe2.
Fig. 5. (a) LSV polarization curves of Pt/MoSe2, PtMo/C, Pt/C and MoSe2. Tafel plots (b), specific activity (c) and TOF curves (d) of Pt/MoSe2, PtMo/C, Pt/C catalysts. (e) LSV polarization curves before and after 1000 CV cycles of Pt/MoSe2 (inset: CA curve for Pt/MoSe2 in 0.5 mol L?1 H2SO4 + 1.0 mol L?1 CH3OH at an overpotential of 32 mV). (f) LSV polarization curves of the Pt/MoSe2 || Pt/MoSe2 and Pt/C || Pt/C electrodes in 0.5 mol L?1 H2SO4 with and without 1.0 mol L?1 CH3OH (inset: CA curve for Pt/MoSe2 in 0.5 mol L?1 H2SO4 + 1 mol L?1 CH3OH at a potential of 0.66 V).
Fig. 6. (a) The optimized model of Pt/MoSe2. (b) The optimized atomic geometries of the intermediates on Pt/MoSe2 surface. (c) Free energy diagram for MOR on Pt/MoSe2 (red) and Pt (grey) surface. (d) Calculated ECO* on the different sites of different Pt (111) surface of Pt/MoSe2, PtMo and Pt. (e) Electron density difference of Pt/MoSe2 (yellow: electron depletion and blue: electron accumulation). (f) Calculated ΔGH* of Pt/MoSe2, PtMo and Pt/C.
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