J. Mater. Sci. Technol. ›› 2021, Vol. 62: 119-127.DOI: 10.1016/j.jmst.2020.05.068
• Research Article • Previous Articles Next Articles
Mengmeng Zhanga, Jiajun Wanga, Yang Wanga, Jinfeng Zhanga, Xiaopeng Hana, Yanan Chena, Yuesheng Wangb, Zaghib Karimb, Wenbin Hua,c, Yida Denga,*()
Received:
2020-04-22
Revised:
2020-05-12
Accepted:
2020-05-15
Published:
2021-01-30
Online:
2021-02-01
Contact:
Yida Deng
About author:
* E-mail address: yida.deng@tju.edu.cn (Y. Deng).Mengmeng Zhang, Jiajun Wang, Yang Wang, Jinfeng Zhang, Xiaopeng Han, Yanan Chen, Yuesheng Wang, Zaghib Karim, Wenbin Hu, Yida Deng. Promoting the charge separation and photoelectrocatalytic water reduction kinetics of Cu2O nanowires via decorating dual-cocatalysts[J]. J. Mater. Sci. Technol., 2021, 62: 119-127.
Fig. 2. (a) The TEM image of the Cu2O@C-MoS2 photocathode. (b) The SAED pattern of the selected area marked in (a). (c) The HRTEM image of the selected area marked in (a) (the yellow region represents the carbon layer, and the cyan dash lines mean the MoS2 nanosheets), and the right images are the amplification of A and B regions in (c). (d) The elemental mapping images of Cu, O, C, S, Mo, and overlap for the Cu2O@C-MoS2 photocathode.
Fig. 3. (a) The Raman spectra of Cu2O@C-MoS2, Cu2O-MoS2, Cu2O@C, and Cu2O. The core-level XPS spectra of (b) Cu 2p, (c) O 1s, (d) C 1s, (e) Mo 3d, and (f) S 2p for the Cu2O@C-MoS2 photocathode.
Fig. 4. The optical performances and photoelectrochemical HER performances of Cu2O@C-MoS2, Cu2O-MoS2, Cu2O@C, and Cu2O. (a) The UV-vis spectra. (b) The corresponding Tauc plots. (c) LSV plots ranged from 0.6 VRHE to 0 VRHE at a scan rate of 2 mV s-1 with the light illumination. (d) Photo-response curves were measured at the potential of 0 VRHE for 300 s with the light-chopped of 20 s. (e) IPCE at 0 VRHE. (f) Photo-stability was tested at 0 VRHE for 4 h. The light source is AM 1.5G with an intensity of 100 mW cm-2 and the electrolyte is 0.5 M Na2SO4 solution.
Fig. 5. The separation and transfer of photogenerated charge for Cu2O@C-MoS2, Cu2O-MoS2, Cu2O@C, and Cu2O. (a) The Nyquist curves are tested at the potential of 0 VRHEunder light, the amplitude of 10 mV, and the frequency from 0.01 Hz to 100,000 Hz (the simulated circuit is inserted). (b) The potential of —M-S plots ranges from 0.4 VRHE to 0.8 VRHE. Here, the light source is AM 1.5G with an intensity of 100 mW cm-2 and the electrolyte is 0.5 M Na2SO4 solution. (c) Photoluminescence quenching curves excited at a wavelength of 370 nm. (d) Band-edge photoluminescence decay plots.
Fig. 6. (a) Room-temperature ESR curves. (b) Valence band spectra obtained from XPS. (c) Band energy levels of Cu2O@C-MoS2 and Cu2O. (d) Schematic diagram of the proposed photogenerated charge generation, separation, and transfer mechanism of the Cu2O@C-MoS2 photocathode for PEC hydrogen evolution (wherein, e- means photogenerated electron, h+ means photogenerated hole).
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