Cu surface doped TiO2: Constructing Cu single-atoms active sites and broadening the photo-response range for efficient photocatalytic hydrogen production

Xiao, Bin; Shen, Congcong; Luo, Zhongbao; Li, Dequan; Kuang, Xinya; Wang, Dengke; Zi, Baoye; Yan, Ruihan; Lv, Tianping; Zhou, Tong; Zhang, Jin; Liu, Qingju

doi:10.1016/j.cej.2023.143650

Cited by 38 publications

(5 citation statements)

References 57 publications

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“…However, the Cu 3d states occupy an essential role in the VB top, which generates new states at the top of VB, thereby increasing the top of the VB. 72,74 Consequently, the band gap of Cu/TiO 2 (001) is reduced in comparison with that of TiO 2 (001), illustrating that Cu ion doping can narrow the band gap of TiO 2 (001), 56,57 which is consistent with the experimental results. Moreover, new occupation states are introduced in the vicinity of the Fermi energy level for Cu/TiO 2 (001), which is ascribed to the coupling of the d orbital of the Cu atom and the p orbital of the O atom.…”

Section: Resultssupporting

confidence: 86%

“…Compared to TiO 2 (001), Cu/TiO 2 (001), Cu/TiO 2 (101), and Cu/TiO 2 (001 + 101) exhibit obvious red-shifts and enhanced the intensity of light adsorption (Figure a). Moreover, the Cu/TiO 2 (001) photocatalytst shows the most significant visible light adsorption capacity, which is attributed to the fact that Cu ion doping can reduce the band gap of TiO 2 (001), thus enhancing the photoresponse. , Meanwhile, the light adsorption in the wavelength band above 550 nm of Cu/TiO 2 (001), Cu/TiO 2 (101), and Cu/TiO 2 (001 + 101) is strengthened mainly due to absorption vibration of Cu . In addition, the carbon and nitrogen residues are not major factors for photocatalytic CO 2 reduction activity (Table S2).…”

Section: Resultsmentioning

confidence: 99%

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Shaping and Doping Metal–Organic Framework-Derived TiO₂ to Steer the Selectivity of Photocatalytic CO₂ Reduction toward CH₄

Li,

Zhou

et al. 2024

Inorg. Chem.

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Steering selectivity in photocatalytic conversion of CO 2 , especially toward deep reduction products, is vital to energy and environmental goals yet remains a great challenge. In this work, we demonstrate a facet-dependent photocatalytic selective reduction of CO 2 to CH 4 in Cudoped TiO 2 catalysts exposed with different facets synthesized by a topological transformation from MIL-125 (Ti) precursors. The optimized round cake-like Cu/TiO 2 photocatalyst mainly exposed with the (001) facet exhibited a high photocatalytic CO 2 reduction performance with a CH 4 yield of 40.36 μmol g −1 h −1 with a selectivity of 94.1%, which are significantly higher than those of TiO 2 (001) (4.70 μmol g −1 h −1 and 52.6%, respectively), Cu/TiO 2 (001 + 101) (18.95 μmol g −1 h −1 and 69.6%, respectively), and Cu/TiO 2 (101) (14.73 μmol g −1 h −1 and 78.9%, respectively). The results of experimental and theoretical calculations demonstrate that the Cu doping dominating the promoted separation and migration efficiencies of photogenerated charges and the preferential adsorption on (001) facets synergistically contribute to the selective reduction of CO 2 to CH 4 . This work highlights the significance of synergy between facet engineering and ion doping in the design of high-performance photocatalysts with respect to selective reduction of CO 2 to multielectron products.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Shaping and Doping Metal–Organic Framework-Derived TiO₂ to Steer the Selectivity of Photocatalytic CO₂ Reduction toward CH₄

Li,

Zhou

et al. 2024

Inorg. Chem.

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“…On the other hand, the recombination probability of photogenerated electrons and photogenerated holes in TiO 2 is high, and the lifetime of photogenerated carriers is short. 9 These shortcomings greatly limit the application of TiO 2 in the field of photocatalysis. Therefore, how to improve the photocatalytic activity of TiO 2 has become a current research focus.…”

Section: Introductionmentioning

confidence: 99%

Combination of alkali treatment and Ag₃PO₄ loading effectively improves the photocatalytic activity of TiO₂ nanoflowers

Wang,

Yuan,

Geng

et al. 2024

New J. Chem.

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“…Photocatalysis is a promising technology for the production of clean energy using sunlight-excited semiconductor photocatalysts. − Hydrogen is the world’s cleanest energy source. − The high density and low pollution characteristics of hydrogen energy have made hydrogen evolution and application technologies a focus of attention in the 21st century. In the background of global energy demand and the global carbon cycle, researchers have explored a large number of photocatalysts for hydrogen evolution. − However, most photocatalysts are prone to photogenerated carrier recombination under light excitation, , resulting in inadequate photocatalytic efficiency. Therefore, designing highly active catalysts for hydrogen evolution remains a top priority …”

Section: Introductionmentioning

confidence: 99%

Theoretical Prediction and Synthesis of Nonmetal-Doped Anatase TiO₂ (101) for Boosting Photocatalytic Hydrogen Evolution Reaction

Yang,

Zhao,

et al. 2024

ACS Appl. Nano Mater.

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TiO2-based photocatalysts are eco-friendly, cost-effective, and stable but only exert catalytic performance in the ultraviolet region, and the photocatalytic efficiency is very low. In this work, we employ DFT calculations to deeply investigate the effect of nonmetallic C-doped TiO2 (101) on the photocatalytic hydrogen evolution performance. Specifically, the effects of C substitution or interstitial doping at the surface, subsurface, and bulk on the electronic structure, optical properties, and catalytic hydrogen evolution activity were substantially investigated. We discovered that different C atom doping strategies impinge different effects on the catalytic activity. Among them, the CO-bulk4, CTi-surf2, and Cinter-surf systems showed superior catalytic activities with ΔG of −0.012, −0.055, and −0.024 eV, respectively. The C atom replaces the Ti atom and alters the original coordination environment, which leads to charge redistribution and consequently to the activation of the O sites. Additionally, carbon-self-doped TiO2 photocatalysts were fabricated using an experimental hydrothermal synthesis, and the XPS analyses confirmed that O is replaced by C. In addition, the photocatalytic hydrogen evolution rate is 0.3 mmol g–1 h–1, while there is no hydrogen evolution for pure TiO2. Our findings suggest that nonmetallic doped TiO2(101) photocatalysts can improve light absorption, modulate charge distribution, and enhance hydrogen evolution activity.

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Cu surface doped TiO2: Constructing Cu single-atoms active sites and broadening the photo-response range for efficient photocatalytic hydrogen production

Cited by 38 publications

References 57 publications

Shaping and Doping Metal–Organic Framework-Derived TiO₂ to Steer the Selectivity of Photocatalytic CO₂ Reduction toward CH₄

Shaping and Doping Metal–Organic Framework-Derived TiO₂ to Steer the Selectivity of Photocatalytic CO₂ Reduction toward CH₄

Combination of alkali treatment and Ag₃PO₄ loading effectively improves the photocatalytic activity of TiO₂ nanoflowers

Theoretical Prediction and Synthesis of Nonmetal-Doped Anatase TiO₂ (101) for Boosting Photocatalytic Hydrogen Evolution Reaction

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Cu surface doped TiO2: Constructing Cu single-atoms active sites and broadening the photo-response range for efficient photocatalytic hydrogen production

Cited by 38 publications

References 57 publications

Shaping and Doping Metal–Organic Framework-Derived TiO2 to Steer the Selectivity of Photocatalytic CO2 Reduction toward CH4

Shaping and Doping Metal–Organic Framework-Derived TiO2 to Steer the Selectivity of Photocatalytic CO2 Reduction toward CH4

Combination of alkali treatment and Ag3PO4 loading effectively improves the photocatalytic activity of TiO2 nanoflowers

Theoretical Prediction and Synthesis of Nonmetal-Doped Anatase TiO2 (101) for Boosting Photocatalytic Hydrogen Evolution Reaction

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Shaping and Doping Metal–Organic Framework-Derived TiO₂ to Steer the Selectivity of Photocatalytic CO₂ Reduction toward CH₄

Shaping and Doping Metal–Organic Framework-Derived TiO₂ to Steer the Selectivity of Photocatalytic CO₂ Reduction toward CH₄

Combination of alkali treatment and Ag₃PO₄ loading effectively improves the photocatalytic activity of TiO₂ nanoflowers

Theoretical Prediction and Synthesis of Nonmetal-Doped Anatase TiO₂ (101) for Boosting Photocatalytic Hydrogen Evolution Reaction