التفاصيل البيبلوغرافية
| العنوان: |
Double Z-scheme in SnO2/SnS2/Cu2SnS3 heterojunction for photocatalytic reduction of CO2 to ethanol. |
| المؤلفون: |
Wang, Feng, Zhang, Shunxin, Jing, Wenhao, Qiu, Haoran, Liu, Ya, Guo, Liejin |
| المصدر: |
Journal of Materials Science & Technology; Aug2024, Vol. 189, p146-154, 9p |
| مصطلحات موضوعية: |
ETHANOL, PHOTOREDUCTION, STANNIC oxide, HETEROJUNCTIONS, NEAR infrared reflectance spectroscopy, REFLECTANCE spectroscopy, CARBON dioxide |
| مستخلص: |
• A double Z-scheme SnO 2 /SnS 2 /Cu 2 SnS 3 was synthesized by one-pot method. • SnO 2 /SnS 2 /Cu 2 SnS 3 catalyst improves ethanol selectivity without sacrificial agent. • The introduction of SnS 2 and Cu 2 SnS 3 broadened the light absorption. Photocatalytic reduction of CO 2 to chemical fuels enables a sustainable way of reducing carbon emissions but faces a high reduction potential due to the high stability of CO 2 molecules. Here, we prepared a SnO 2 /SnS 2 /Cu 2 SnS 3 double Z-scheme heterojunction photocatalyst, in which SnO 2 , SnS 2 , and Cu 2 SnS 3 absorb ultraviolet, visible, and near-infrared light, respectively. Based on the comprehensive analysis of in-situ X-ray photoelectron spectroscopy and photo(chemical) characterizations, we find that the photogenerated electrons would transfer from SnO 2 to SnS 2 to Cu 2 SnS 3. The optimized SnO 2 /SnS 2 /Cu 2 SnS 3 –0.3 double Z-scheme heterojunction could achieve 28.44 µmol g–1 h–1 ethanol yield and 92% selectivity, which is roughly 3 folds higher than SnO 2 /SnS 2 single Z-scheme heterojunction. By using in-situ diffuse reflectance infrared Fourier-transform spectroscopy, we observe that ethanol is produced through a *COCOH pathway, in which Cu 2 SnS 3 would decrease the activation energy barrier from *COOH to *CO. The low efficiency of solar-to-fuel conversion and the poor selectivity of products have also been the main challenges of photocatalytic CO 2 reduction. The construction of heterojunction is of great significance for the broadening of near-infrared light absorption, strengthening CO 2 reduction capacity, and increasing product selectivity and yield. The SnO 2 /SnS 2 /Cu 2 SnS 3 double Z-scheme heterojunction was prepared for photocatalytic CO 2 reduction without the sacrificial agent, and its ethanol yield and selectivity reached 28.44 mmol g–1 h–1 and 92 %, respectively. [Display omitted] [ABSTRACT FROM AUTHOR] |
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