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Effective graphene incorporation of strontium niobate–doped titanium oxide for photocatalytic hydrogen production.
In: Journal of Cleaner Production, Jg. 423 (2023-10-15), S. N.PAG
academicJournal
Zugriff:
To meet the increasing global demand for clean energy and mitigate the impact of CO 2 emissions on climate change, the production of photocatalytic hydrogen through water splitting is a compelling scientific and technological objective. Despite considerable efforts, the establishment of a reliable and highly efficient system for hydrogen generation powered by visible light remains challenging. In this study, we developed a solar-active strontium niobate-doped titanium oxide incorporated with graphene (Sr 2 Nb 2 O 7 –rGO–TiO 2), characterized by various analytical techniques such as optical, morphological, HR-TEM, XPS, and XRD. Sr 2 Nb 2 O 7 –rGO–TiO 2 demonstrated enhanced photocatalytic H 2 evolution under solar irradiation without requiring precious-metal doping. The maximum H 2 production performance rate of 1769 μmol/g/h was attained with the Sr 2 Nb 2 O 7 –rGO–TiO 2 composites, significantly surpassing those of the bare (TiO 2 : 210 μmol/g/h, Sr 2 Nb 2 O 7 : 88 μmol/g/h) and binary (TiO 2 –rGO: 430 μmol/g/h, Sr 2 Nb 2 O 7 –rGO: 176 μmol/g/h, and Sr 2 Nb 2 O 7 –TiO 2 : 880 μmol/g/h) photocatalysts. The enhanced performance of the Sr 2 Nb 2 O 7 –rGO–TiO 2 composite is attributable to the synergistic effect of rGO acting as an electron-transfer bridge. Thus, with the integration of rGO, absorption is attainable in an extended range up to 445 nm (2.90 eV), suggesting that the composite material could enable the catalyst to absorb more visible light. Additionally, the composite exhibited minor degradation after five consecutive cycles, demonstrating its excellent stability and reusability for hydrogen generation. Based on a comprehensive evaluation of the ESR and transient photocurrent response, a potential Z-scheme mechanism for the photocatalytic H 2 generation activity over Sr 2 Nb 2 O 7 –rGO–TiO 2 was suggested. The Z-scheme processability allows more electrons to contribute to the H 2 evolution reduction. In this study, we developed a non-toxic, cost-effective, highly efficient, and recyclable photocatalyst for H 2 production. [Display omitted] • Ternary Sr 2 Nb 2 O 7 -rGO-TiO 2 is reported first time for sustainable H 2 production. • Sr 2 Nb 2 O 7 -rGO-TiO 2 ternary catalyst shows suppressed charge recombination. • The H 2 generation is improved by 1769 μmolg−1h−1 as compared to bare catalyst. • The Z-scheme electron transfer mechanism was discussed using ESR analysis. [ABSTRACT FROM AUTHOR]
Titel: |
Effective graphene incorporation of strontium niobate–doped titanium oxide for photocatalytic hydrogen production.
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Autor/in / Beteiligte Person: | Raja, Annamalai ; Son, Namgyu ; Swaminathan, Meenakshisundaram ; Kang, Misook |
Zeitschrift: | Journal of Cleaner Production, Jg. 423 (2023-10-15), S. N.PAG |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 0959-6526 (print) |
DOI: | 10.1016/j.jclepro.2023.138809 |
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