Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (10): 1763-1771.DOI: 10.1016/S1872-2067(21)63799-3
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Qiang Lia, Zhenhuan Zhaoa(), Xiaoxia Baia, Xin Tongb, Shuai Yuec, Jingying Luoa, Xin Yud, Zhenni Wanga, Zheng Wanga(), Peipei Lia, Yanping Lianga, Zhiming Wangb()
Received:
2021-01-23
Accepted:
2021-03-05
Online:
2021-10-18
Published:
2021-06-20
Contact:
Zhenhuan Zhao,Zheng Wang,Zhiming Wang
About author:
$E-mail: zhmwang@uestc.edu.cnSupported by:
Qiang Li, Zhenhuan Zhao, Xiaoxia Bai, Xin Tong, Shuai Yue, Jingying Luo, Xin Yu, Zhenni Wang, Zheng Wang, Peipei Li, Yanping Liang, Zhiming Wang. Tunable and stable localized surface plasmon resonance in SrMoO4 for enhanced visible light driven nitrogen reduction[J]. Chinese Journal of Catalysis, 2021, 42(10): 1763-1771.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63799-3
Fig. 1. XRD patterns (a) and Raman spectra (b) of SrMoO4, SMO-10 min, SMO-3 h, SMO-6 h and SMO-8 h; (c) HRTEM image of SMO-10 min, the insert in (c) is the FFT pattern; (d) EDX elemental mapping images of SMO-10 min showing the homogeneous distribution of Sr, Mo, and O.
Fig. 2. (a) The UV-vis spectra of the SrMoO4 samples annealed in H2/Ar for different time, the inset shows the photographs of SrMoO4 (white powder) and SMO-10 min (black powder); (b) The UV-vis spectra of the SMO-10 min sample stored for different time; (c) The ammonia production rate of the samples under full spectrum and visible light irradiation (λ > 420 nm); (d) The AQE of photocatalytic nitrogen reduction for ammonia over SrMoO4 and SMO-10 min under monochromatic light irradiation; (e) The ammonia production rate of the SMO-10 min sample and the sample exposed to air for four months under full spectrum irradiation; (f) The ammonia production rate of the SMO-10 min sample with five repeated cycles of photocatalytic experiments.
Fig. 3. Chemical states characterization. XPS core level spectra for Mo 3d (a), O 1s (b), and Sr 3d (c) for the pristine SrMoO4 and the SMO-10 min sample; (d) EPR spectra at 77 K of the pristine SrMoO4 and the annealed samples.
Fig. 4. (a) Ultraviolet photoelectron spectroscopy (UPS) of SrMoO4 and SMO-10 min; (b) Mott-Schottky plots of the pristine SrMoO4, the annealed samples in hydrogen (SMO-10 min, SMO-3 h, SMO-6 h, and SMO-8 h); (c) The transient photocurrent density of the pristine SrMoO4 and the annealed samples under the full spectrum and visible light (λ > 420 nm) irradiation, respectively; (d) The transient photocurrent density of the pristine SrMoO4 and the SMO-10 min sample under irradiation of monochromatic light (450, 500, 600, and 650 nm).
Fig. 5. (a) Ultrafast TA spectra of SMO-10 min after 360 nm excitation; (b) TA kinetics curves of the SMO-10 min sample with the probe wavelength of 505 nm; (c) The schematic illustration of the crystalline structure of the oxygen vacancy rich SrMoO4 and the proposed nitrogen fixation mechanism by LSPR excitation.
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