Interface engineering via temperature-dependent self-transformation on SnS2/SnS for enhanced piezocatalysis

doi:10.1016/S1872-2067(24)60101-4

Abstract

Abstract:

Heterojunction has been widely used in vibration-driven piezocatalysis for enhanced charges separation, while the weak interfaces seriously affect the efficiency during mechanical deformations due to prepared by traditional step-by-step methods. Herein, the intimate contact interfaces with shared S atoms are ingeniously constructed in SnS₂/SnS anchored on porous carbon by effective interface engineering, which is in-situ derived from temperature-dependent self-transformation of SnS₂. Benefiting from intimate contact interfaces, the piezoelectricity is remarkably improved due to the larger interfacial dipole moment caused by uneven distribution of charges. Importantly, vibration-induced piezoelectric polarization field strengthens the interfacial electric field to further promote the separation and migration of charges. The dynamic charges then transfer in porous carbon with high conductivity and adsorption for significantly improved piezocatalytic activity. The degradation efficiency of bisphenol A (BPA) is 6.3 times higher than SnS₂ and H₂ evolution rate is increased by 3.8 times. Compared with SnS₂/SnS prepared by two-step solvothermal method, the degradation efficiency of BPA and H₂ evolution activity are increased by 3 and 2 times, respectively. It provides a theoretical guidance for developing various multiphase structural piezocatalyst with strong interface interactions to improve the piezocatalytic efficiency.

Key words: Piezocatalysis, Self-transformation, Phase junction, Interfacial field, Polarized field

Wenrou Tian, Jun Han, Najun Li, Dongyun Chen, Qingfeng Xu, Hua Li, Jianmei Lu. Interface engineering via temperature-dependent self-transformation on SnS₂/SnS for enhanced piezocatalysis[J]. Chinese Journal of Catalysis, 2024, 64: 166-179.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60101-4

https://www.cjcatal.com/EN/Y2024/V64/I9/166

Figures/Tables 8

Scheme 1. Schematic illustration of the synthetic routes for ZNC@SnS2/SnS.

Fig. 1. Structural characterization of ZNC@SnS2/SnS. SEM images of 0-SZNC (a), 400-SZNC (b), 450-SZNC (c) and 500-SZNC (d). (e) XRD pattern. (f) Raman spectra. (g) Elemental analysis of Sn and S atoms and S/Sn ratio from EDX. TEM image (h), HRTEM image (i), SAED pattern (j), HAADF image (k) and EDX images (l) of 450-SZNC.

Fig. 2. Valence states of surface elements and specific surface area. Survey (a), C 1s (b), N 1s (c), Sn 3d (d) XPS spectra of samples. (e) Area% of Sn2+ and Sn4+ obtained from XPS analysis. (f) S 2p XPS spectra. N2 adsorption-desorption isotherms (g), pore size distribution curves (h), and the detailed pore information comparison (i) of different samples.

Fig. 3. Piezocatalytic activity of samples for degradation BPA. (a) Adsorption curves. (b) Piezocatalytic degradation curves. Blank indicates no catalyst. (c) The reaction rate constant k of BPA on samples. (d) BPA removal rate for successive five cycles by 450-SZNC. The effect of ultrasonic powers (e,f), catalyst dose (g), coexisting anions (10 mmol L-1) (h) and solution pH (i) on BPA degradation by 450-SZNC.

Fig. 4. Identify of the ROS and quenching experiments. ESR spectra of DMPO-·O2- (a), TEMP-1O2 (b) and DMPO-·OH (c) of samples under ultrasonic vibration. The concentration of ·O2- (d), the generation rate of 1O2 (e), the concentration of OH (f) and H2O2 (g), quenching experiment (h), the corresponding reaction rate constants and relative contributions (i) of various active species.

Fig. 5. Piezocatalytic H2 evolution activity. The H2 yields (a) and corresponding evolution rates (b) of samples under ultrasonic vibration. Blank indicates no catalyst. (c,d) The effect of ultrasonic powers on H2 evolution by 450-SZNC. (e,f) H2 generation for successive five cycles by 450-SZNC. (g) H2 evolution performance comparison of 450-SZNC with the reported typical piezocatalysts.

Fig. 6. Piezoelectric properties of 450-SZNC and charge separation ability. Amplitude (a) and phase images (b), piezoresponse phase reversal hysteresis ring and amplitude butterfly loop (c) of 450-SZNC obtained by PFM. (d) KPFM potential image, inset: the corresponding surface potential of 450-SZNC. Piezo-current response (e) and EIS plots (f) of the samples under ultrasonic vibration. (g) Formation and charge transfer mechanism of SnS2/SnS p-n junction.

Fig. 7. Theoretical calculations and mechanism analysis of piezocatalysis. (a,e) Computational models of SnS2/SnS. Bond length and bond angle of the interface without (b) and with (f) vibration, simulated differential charge density distribution over SnS2/SnS without (c) and with (g) vibration. (d,h) Planar averaged charge density difference of SnS2/SnS. (i,j) Electrostatic potential of SnS2/SnS. The applying pressure of vibration is 5 GPa. (k) Piezocatalytic mechanism of organic pollutants degradation and water splitting to H2 on 450-SZNC.

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Interface engineering via temperature-dependent self-transformation on SnS₂/SnS for enhanced piezocatalysis

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