Coralline-like Ni2P decorated novel tetrapod-bundle Cd0.9Zn0.1S ZB/WZ homojunctions for highly efficient visible-light photocatalytic hydrogen evolution

doi:10.1016/S1872-2067(20)63597-5

Abstract

Abstract:

In this study,Ni2P-Cd0.9Zn0.1S (NPCZS) composites were synthesized by coupling tetrapod bundle Cd0.9Zn0.1S (CZS) and coralline-like Ni2P (NP) via a simple calcination method. CZS shows outstanding activity in photocatalytic hydrogen evolution (1.31 mmol h-1),owing to its unique morphology and heterophase homojunctions (ZB/WZ),which accelerate the separation and transfer of photogenerated charges. After coupling with NP,the photoactivity of NPCZS was enhanced,and the maximum hydrogen evolution rate of 1.88 mmol h-1 was reached at a NP content of 12 wt%,which was 1.43 times higher than that of pure CZS. The experimental results of the photocatalytic activity,viz. photoluminescence spectra,surface photovoltage spectra,and electrochemical test showed that the enhanced photoactivity of NPCZS should be attributed to the synergistic effects of the novel tetrapod-bundle morphology,heterophase homojunctions,and decoration of the NP co-catalyst. Moreover,the as-prepared NPCZS composites exhibited excellent photostability and recyclability. Herein,we propose a possible mechanism for the enhanced photocatalytic activity.

Key words: Photocatalytic hydrogen evolution, Cd0.9Zn0.1S, Ni2P, Homojunctions, Noble-metal-free

Zhuwang Shao, Xiao Meng, Hong Lai, Dafeng Zhang, Xipeng Pu, Changhua Su, Hong Li, Xiaozhen Ren, Yanling Geng. Coralline-like Ni₂P decorated novel tetrapod-bundle Cd_0.9Zn_0.1S ZB/WZ homojunctions for highly efficient visible-light photocatalytic hydrogen evolution[J]. Chinese Journal of Catalysis, 2021, 42(3): 439-449.

Figures/Tables 10

Fig. 1. Schematic of the fabrication procedure of NPCZS.

Fig. 2. XRD patterns of CZS (a) and NP and NPCZS composites (b).

Fig. 3. SEM images of CZS (a,b),NP (c,d),and NPCZS-12 (e); (f) EDS spectrum and EDS mapping for different elements of NPCZS-12.

Fig. 4. (a) TEM and (b) HRTEM images of CZS; (c) TEM image of CZS arm; (d) TEM and (e) HRTEM images of NPCZS composite.

Fig. 5. Survey spectra (a) and high-resolution XPS spectra (b-f) of Zn 2p,Cd 3d,S 2p,Ni 2p,and P 2p.

Fig. 6. UV-vis DRS of CZS,NP,and NPCZS composites; inset shows Tauc plots of ?αhν?2 over hν of CZS.

Fig. 7. Time-dependent photocatalytic H2 evolution (a) and average H2 production rates (b) of as-obtained samples under visible-light irradiation; (c) curves for photocatalytic H2 evolution cycling of NPCZS-12 under visible-light irradiation.

Fig. 8. Time-dependent photocatalytic H2 evolution (a) and average H2 production rates (b) of CZS,CZS-U50,CZS-U100,and CZS-G under visible-light irradiation.

Fig. 9. PL spectra (a),transient photocurrent responses (b),SPV spectra (c) (inset shows the schematic setup for SPV measurement),and EIS (d) of CZS,NP,and NPCZS composites.

Fig. 10. (a) Mechanism of photogenerated charge separation of ZB/WZ homojunctions over CZS for the photocatalytic HER; (b) M-S plot of CZS; (c) photocatalytic mechanism of NPCZS under visible-light irradiation.

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Coralline-like Ni₂P decorated novel tetrapod-bundle Cd_0.9Zn_0.1S ZB/WZ homojunctions for highly efficient visible-light photocatalytic hydrogen evolution

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