Amorphous-crystalline junction oxygen vacancy-enriched CoPi/ZnIn2S4/a-B-TiO2 catalyst for oxygen evolution reaction

Wu, Pengcheng; Yelemulati, Huoerhute; Zhu, Shanshan; Peng, Bowen; Li, Hailong; Ye, Hongyong; Hou, Juan; Wu, Keliang; Li, Yong

doi:10.1016/j.cej.2023.143252

Cited by 11 publications

(2 citation statements)

References 34 publications

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“…However, there are significant differences in the intensity of the spectra. As is known, a higher intensity of PL signals corresponds to a higher recombination rate of charge carriers [37,38]. In this regard, low PL intensity is preferred for using the material as a photocatalyst [39,40].…”

Section: Photocatalytic Activity Resultsmentioning

confidence: 97%

Photocatalytic Activity of Ag Nanoparticles Deposited on Thermoexfoliated g-C3N4

Portillo-Cortez,

Caudillo-Flores,

Sánchez-López

et al. 2024

Nanomaterials

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The limited access to fresh water and the increased presence of emergent pollutants (EPs) in wastewater has increased the interest in developing strategies for wastewater remediation, including photocatalysis. Graphitic carbon nitride (g-C3N4) is a 2D non-metal material with outstanding properties, such as a 2.7 eV bandgap and physicochemical stability, making it a promising photocatalyst. This work reports the process of obtaining high-surface-area (SA) g-C3N4 using the thermal-exfoliation process and the posterior effect of Ag-nanoparticle loading over the exfoliated g-C3N4 surface. The photocatalytic activity of samples was evaluated through methylene blue (MB) degradation under visible-light radiation and correlated to its physical properties obtained by XRD, TEM, BET, and UV–Vis analyses. Moreover, 74% MB degradation was achieved by exfoliated g-C3N4 compared to its bulk counterpart (55%) in 180 min. Moreover, better photocatalytic performances (94% MB remotion) were registered at low Ag loading, with 5 wt.% as the optimal value. Such an improvement is attributed to the synergetic effect produced by a higher SA and the role of Ag nanoparticles in preventing charge-recombination processes. Based on the results, this work provides a simple and efficient methodology to obtain Ag/g-C3N4 photocatalysts with enhanced photocatalytic performance that is adequate for water remediation under sunlight conditions.

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Section: Photocatalytic Activity Resultsmentioning

confidence: 97%

Photocatalytic Activity of Ag Nanoparticles Deposited on Thermoexfoliated g-C3N4

Portillo-Cortez,

Caudillo-Flores,

Sánchez-López

et al. 2024

Nanomaterials

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“…BÀ TiO 2 contained BÀ OÀ Ti structures, and a catalyst prepared with 1.4 % B dopant exhibited a phenol degradation rate of 100 % under visible light. [23] Zhang reported that boron doping can be used to replace O with B 3 + in the TiO 2 lattice. This strategy was used to increase the surface area of TiO 2 from 92 m 2 /g to 109.6 m 2 /g, increase the total pore volume from 0.317 cm 3 /g to 0.351 cm 3 /g, and enhance the light absorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Preparation of nanoflower NiO/B−TiO₂/ZnIn₂S₄ composite catalyst with highly efficient hydrogen production and dye degradation performance

Wang,

Yang,

et al. 2023

ChemistrySelect

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The use of semiconductor photocatalysts for the hydrogen evolution reaction shows good promise for effectively alleviating the existing energy shortage. Moreover, ternary metal sulfides also exhibit stronger photoresponse performance and suitable band structures, leading to good photocatalytic activity. However, carrier recombination easily occurs in ternary metal sulfides, negatively affecting their photocatalytic performance. In order to address the above issues, this study achieved limited improvement in the electron recombination problem of ternary sulfides through a dual strategy of constructing a heterogeneous structure to quickly export electrons and extracting electrons through the loading of a co catalyst. The combination of B doped TiO2 and nano flower shaped ZnIn2S4 photocatalyst effectively increases the catalytic active sites, widens the absorption band edges, and improves the efficiency of photo generated electron and hole separation. The loading of NiO as a cocatalyst increased the light absorption intensity, changed the direction of electron transfer enrichment, and provided hydrogen production sites. Compared to pure TiO2, which had a band gap of 2.37 eV, the band gap of the modified catalyst decreased to 2.27 eV. Moreover, the hydrogen evolution rate increased by 2.17 fold from 3.84 mmol/(g ⋅ h) to 8.33 mmol/(g ⋅ h). The separation and migration rates of electrons and holes were significantly enhanced, which promoted rapid charge transfer. Moreover, the modified catalyst achieved Rhodamine B (RhB) and Congo red photocatalytic degradation rates of 99.91 % and 97.98 % in 1 h under simulated sunlight irradiation.

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Oxygen vacancy-enriched CoPi/TiO2 nanotubes/WO3 electrode for enhanced photoelectrochemical water oxidation

Yu,

Sun,

Fang

et al. 2024

J Mater Sci: Mater Electron

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Amorphous-crystalline junction oxygen vacancy-enriched CoPi/ZnIn2S4/a-B-TiO2 catalyst for oxygen evolution reaction

Cited by 11 publications

References 34 publications

Photocatalytic Activity of Ag Nanoparticles Deposited on Thermoexfoliated g-C3N4

Photocatalytic Activity of Ag Nanoparticles Deposited on Thermoexfoliated g-C3N4

Preparation of nanoflower NiO/B−TiO₂/ZnIn₂S₄ composite catalyst with highly efficient hydrogen production and dye degradation performance

Oxygen vacancy-enriched CoPi/TiO2 nanotubes/WO3 electrode for enhanced photoelectrochemical water oxidation

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Amorphous-crystalline junction oxygen vacancy-enriched CoPi/ZnIn2S4/a-B-TiO2 catalyst for oxygen evolution reaction

Cited by 11 publications

References 34 publications

Photocatalytic Activity of Ag Nanoparticles Deposited on Thermoexfoliated g-C3N4

Photocatalytic Activity of Ag Nanoparticles Deposited on Thermoexfoliated g-C3N4

Preparation of nanoflower NiO/B−TiO2/ZnIn2S4 composite catalyst with highly efficient hydrogen production and dye degradation performance

Oxygen vacancy-enriched CoPi/TiO2 nanotubes/WO3 electrode for enhanced photoelectrochemical water oxidation

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Preparation of nanoflower NiO/B−TiO₂/ZnIn₂S₄ composite catalyst with highly efficient hydrogen production and dye degradation performance