Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (1): 25-36.DOI: 10.1016/S1872-2067(20)63600-2
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Rongchen Shena, Yingna Dingb, Shibang Lib, Peng Zhangc, Quanjun Xiangd, Yun Hau Nge,#(), Xin Lia,b,*()
Received:
2020-03-02
Accepted:
2020-04-21
Online:
2021-01-18
Published:
2021-01-18
Contact:
Yun Hau Ng,Xin Li
About author:
#E-mail: yunhau.ng@cityu.edu.hkSupported by:
Rongchen Shen, Yingna Ding, Shibang Li, Peng Zhang, Quanjun Xiang, Yun Hau Ng, Xin Li. Constructing low-cost Ni3C/twin-crystal Zn0.5Cd0.5S heterojunction/homojunction nanohybrids for efficient photocatalytic H2 evolution[J]. Chinese Journal of Catalysis, 2021, 42(1): 25-36.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63600-2
Fig. 1. (A, B, D, E) TEM images of twin nanocrystal ZCS solid solution, (C) HRTEM image of twin nanocrystal ZCS solid solution, (F) FFT pattern indicating that the twins in each grain are parallel to each other in (111) planes.
Sample | Atomic fraction (at%) | Weight fraction (wt%) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
ZCS | Zn | Cd | S | Ni | C | Zn | Cd | S | Ni | C | |
ZCS-1 | 15.33 | 15.58 | 30.54 | 0.56 | 37.99 | 23.68 | 41.47 | 23.23 | 0.79 | 10.83 |
Table 1 Experimental data of EDS of ZCS-1.
Sample | Atomic fraction (at%) | Weight fraction (wt%) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
ZCS | Zn | Cd | S | Ni | C | Zn | Cd | S | Ni | C | |
ZCS-1 | 15.33 | 15.58 | 30.54 | 0.56 | 37.99 | 23.68 | 41.47 | 23.23 | 0.79 | 10.83 |
Fig. 5. (A) N2 adsorption-desorption isotherms and the corresponding pore size distribution curves (inset) of ZCS and ZCS-1. (B) BET surface areas and pore volumes of ZCS and ZCS-1.
Fig. 7. Time courses (A) and average rates (B) of H2 evolution over different composite photocatalysts. (C) Comparison of H2 evolution activities of Ni3C, twin nanocrystal Zn1-xCdxS solid solutions with different Zn/Cd ratios, ZCS-1 composite, and ZCS-1%Pt. (D) Wavelength dependence of the apparent quantum efficiencies for the ZCS-1 sample. Reaction conditions: 50 mg of catalyst; 80 mL of 0.25 M Na2S-Na2SO3 aqueous solution; xenon lamp (300 W) light source with a UV cutoff filter (λ ≥ 420 nm).
Fig. 8. Repeated time courses of photocatalytic H2 evolution on ZCS-1 (A) and ZCS (B) samples. Reaction conditions: 50 mg of catalyst; 80 mL of 0.25 M Na2S-Na2SO3 aqueous solution; xenon lamp (350 W) light source with a UV cutoff filter (λ ≥ 420 nm).
Fig. 9. PL spectra (A) transient photocurrent responses (I-t curves) (B), electrochemical impedance spectroscopy Nyquist plots (C), and Mott-Schottky (MS) plots (D) of ZCS and ZCS-1 photocatalysts.
Fig. 11. Polarization curves of the photocatalysts were measured at a scan rate of 5 mV s-1 in 0.5 M H2SO4 solution (A) and 0.25 M Na2S-Na2SO3 aqueous solution (B).
Fig. 12. Valence-band XPS profile of twin nanocrystal ZCS solid solution (ZCS) (A), ZCS-1 (B), corresponding bandgap structures (C) of two photocatalysts.
Scheme 1. Proposed photocatalytic H2 evolution and charge transfer mechanisms in the Ni3C/Zn0.5Cd0.5S composite photocatalyst under visible light irradiation.
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