Efficient photocatalytic oxygen activation by oxygen-vacancy-rich CeO2-based heterojunctions: Synergistic effect of photoexcited electrons transfer and oxygen chemisorption

Applied Catalysis B Environment and Energy, Journal Year: 2021, Volume and Issue: 289, P. 120020 - 120020

Published: Feb. 22, 2021

Language: Английский

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Photocatalytic H₂O Overall Splitting into H₂ Bubbles by Single Atomic Sulfur Vacancy CdS with Spin Polarization Electric Field

ACS Nano, Journal Year: 2021, Volume and Issue: 15(11), P. 18006 - 18013

Published: Oct. 21, 2021

Low efficient transfer of photogenerated charge carriers to redox sites along with high surface reaction barrier is a bottleneck problem photocatalytic H2O overall splitting. Here, in the absence cocatalysts, splitting has been achieved by single-atomic S vacancy hexagonal CdS spin polarization electric field (PEF). Theoretical and experimental results confirm that vacancy-induced PEF opposite direction Coulomb accelerates carrier transport dynamics from bulk phase surface-redox sites. By systematically tuning intensity content, common pristine converted photocatalyst can efficiently complete releasing great number H2 bubbles under natural solar light. This work solves energy conversion essence single atom engineering, which will promote significant performance enhancement for commercialization.

Language: Английский

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Construction of a Z-scheme heterojunction for high-efficiency visible-light-driven photocatalytic CO₂reduction

Nanoscale, Journal Year: 2021, Volume and Issue: 13(8), P. 4359 - 4389

Published: Jan. 1, 2021

This review concisely reports the photoreduction mechanism of CO₂, construction, application, and upgrade strategies for Z-scheme heterostructures.

Language: Английский

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Pauling-type adsorption of O2 induced electrocatalytic singlet oxygen production on N–CuO for organic pollutants degradation

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Sept. 22, 2022

Due to environmentally friendly operation and on-site productivity, electrocatalytic singlet oxygen (1O2) production via O2 gas is of immense interest in environment purification. However, the side-on configuration on catalysts surface will lead formation H2O, which seriously limits selectivity activity 1O2 production. Herein, we show a robust N-doped CuO (N-CuO) with Pauling-type (end-on) adsorption at N-Cu-O3 sites for selective generation under direct-current electric field. We propose that not only lowers overall activation energy barrier, but also alters reaction pathway form instead key feature determining dissociation Cu-O bonds rather than O-O bonds. The proposed N dopant strategy applicable series transition metal oxides, providing universal electrocatalysts design scheme existing high-performance

Language: Английский

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Tracking S‐Scheme Charge Transfer Pathways in Mo₂C/CdS H₂‐Evolution Photocatalysts

Solar RRL, Journal Year: 2021, Volume and Issue: 5(7)

Published: May 1, 2021

Developing efficient and low‐cost photocatalysts deep investigations on the charge separation transfer pathways are still two key challenges in achieving practical photocatalytic application. Herein, NiS‐modified Mo 2 C/CdS layered nanojunction with cascade 2D coupling interfaces for H evolution is constructed. The as‐prepared ternary step‐scheme (S‐scheme) show excellent hydrogen‐evolution performance of 24.03 mmol g −1 h , which 7.83 3.83 times higher than that CdS CdS/NiS. Surprisingly, it found C can serve as a semiconductor hydrogen evolution, instead cocatalyst. from to identified via both, situ irradiation X‐ray photoelectron spectroscopy (XPS) (ISI XPS) ultraviolet (UPS). Notably, this first report using application, gives full play advantages light‐harvesting charges separation.

Language: Английский

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Highly efficient photosynthesis of hydrogen peroxide in ambient conditions

Proceedings of the National Academy of Sciences, Journal Year: 2021, Volume and Issue: 118(16)

Published: April 14, 2021

Photosynthesis of hydrogen peroxide (H2O2) in ambient conditions remains neither cost effective nor environmentally friendly enough because the rapid charge recombination. Here, a photocatalytic rate as high 114 μmol⋅g-1⋅h-1 for production H2O2 pure water and open air is achieved by using Z-scheme heterojunction, which outperforms almost all reported photocatalysts under same conditions. An extensive study at atomic level demonstrates that electron transfer realized improving photoresponse oxidation semiconductor visible light, when difference between Fermi levels two constituent semiconductors not sufficiently large. Moreover, it verified type II pathway can be converted to desired tuning excitation wavelengths. This feasible strategy developing efficient regulating photoresponses.

Language: Английский

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Boosting photocatalytic hydrogen production coupled with benzyl alcohol oxidation over CdS/metal–organic framework composites

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 421, P. 129870 - 129870

Published: April 19, 2021

Language: Английский

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Chemically Bonded α‐Fe₂O₃/Bi₄MO₈Cl Dot‐on‐Plate Z‐Scheme Junction with Strong Internal Electric Field for Selective Photo‐oxidation of Aromatic Alcohols

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(26)

Published: April 5, 2022

Inferior contact interface and low charge transfer efficiency seriously restrict the performance of heterojunctions. Herein, chemically bonded α-Fe2 O3 /Bi4 MO8 Cl (M=Nb, Ta) dot-on-plate Z-scheme junctions with strong internal electric field are crafted by an in situ growth route. Experimental theoretical results demonstrate that provides a powerful driving force for vectorial migration photocharges between Bi4 , interfacial Fe-O bond not only serves as atomic-level flow highway but also lowers energy barrier, thereby accelerating realizing effective spatial separation. Impressively, manifests significantly improved photocatalytic activity selective oxidation aromatic alcohols into aldehydes (Con. ≥92 %, Sel. ≥96 %), improvement one to two orders magnitude. This work presents insight steering.

Language: Английский

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Engineering piezoelectricity and strain sensitivity in CdS to promote piezocatalytic hydrogen evolution

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Journal Year: 2022, Volume and Issue: 43(5), P. 1277 - 1285

Published: March 25, 2022

Language: Английский

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Construction of rGO-coupled C3N4/C3N5 2D/2D Z-scheme heterojunction to accelerate charge separation for efficient visible light H2 evolution

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 318, P. 121822 - 121822

Published: Aug. 4, 2022

Language: Английский

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