Enhanced photocatalytic activity of C@ZnO core-shell nanostructures and its photoluminescence property

Chen, Tao; Yu, Shanwen; Fang, Xiaoxin; Huang, Hong-Hong; Li, Lun; Wang, Xiuyuan; Wang, Huihu

doi:10.1016/j.apsusc.2016.07.122

Cited by 40 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Subsequently, during the coupling of ZnO with CeO 2 , both Zn 2p 3/2 and Zn 2p 1/2 peaks display affirmative shifts compared to ZnO. 64,65 These positive shifts can be ascribed to the transmission of electrons from ZnO to CeO 2 . The valid immigration path of ZnO electrons can be established from the high-resolution in situilluminated XPS investigation of CeO 2 (Figure 4c).…”

Section: Resultsmentioning

confidence: 94%

“…In comparison with the earlier studies on ZnO and CeO 2 grounded photocatalysts (Table S6), 3AgCZ displays the highest photocatalytic selectivity in the reduction of CO 2 to CO. Conversely, it can be mentioned that a further increase in Ag concentration over 3 mol % results in a decline in the photocatalytic reduction of CO 2 activity. The decline in the photocatalytic reduction of CO 2 can be attributed to the decline in the light absorption due to the “shielding effect” in which the surplus Ag somewhat shields the light absorption of CeO 2 and ZnO. − In addition, 3D Ag–CeO 2 –ZnO nanoflowers exhibit enhanced photocatalytic CO 2 reduction performance compared to Ag–CeO 2 –ZnO nanoparticles, indicating the major role played by the 3D morphology (see the Supporting Information Figure S4). In order to confirm that the reaction is certainly caused by a photocatalytic method, a chain of control tests with diverse reaction settings have been performed.…”

Section: Photocatalytic Reduction Of Co2 With H2o In Visible Light An...mentioning

confidence: 99%

See 1 more Smart Citation

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO₂–ZnO Heterostructures for Highly Improved Photocatalytic CO₂ Reduction

Mahyoub

Hezam

Qaraah

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

The design and engineering of plasmonic metal nanocomposite photocatalysts offer an operative approach for highly efficient CO2 photoreduction. Herein, the authors report a plasmonic 3D flower-like (3DF) Ag–CeO2–ZnO nanocomposite catalyst with effective charge carrier separation/transfer and CO2 adsorption capacity exhibiting a considerable enhanced performance compared to pure ZnO and CeO2 for photocatalytic CO2 reduction to CO and CH4 under UV–vis light. The apparent quantum efficiency of the optimized sample is 4.47% at 420 nm, and the CO2 to CO selectivity reaches up to ∼95%. The enhanced photocatalytic performance of 3DF Ag–CeO2–ZnO can be assigned to the prolonged absorption in the visible light region induced by the surface plasmon resonance (SPR) effect, the efficient separation of photogenerated charges, and the Z-scheme configuration. Furthermore, the photocatalyst displays excellent stability and reusability. The mechanism of the plasmon-mediated Z-scheme structure has been suggested in which Ag NPs act as both visible light absorber and electron mediator.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Photocatalytic Reduction Of Co2 With H2o In Visible Light An...mentioning

confidence: 99%

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO₂–ZnO Heterostructures for Highly Improved Photocatalytic CO₂ Reduction

Mahyoub

Hezam

Qaraah

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…Consequently, considerable efforts were done to overcome this inconvenience along with characteristic high probability for the recombination of photogenerated charge carriers. Innovative approaches demonstrated that by coupling the ZnO with various narrow band-gap materials (metallic and nonmetallic ions [82][83][84] noble metals and oxides [85][86][87][88] or polymer-based materials [89,90] etc. ), it was possible to modulate the band-gap energy and shift the absorption wavelength to the visible region.…”

Section: Zno Nanoparticlesmentioning

confidence: 99%

Polymer Nanocomposites for Photocatalytic Applications

Melinte¹,

Stroea²,

Chibac-Scutaru³

2019

Catalysts

View full text Add to dashboard Cite

In the present comprehensive review we have specifically focused on polymer nanocomposites used as photocatalytic materials in fine organic reactions or in organic pollutants degradation. The selection of the polymer substrates for the immobilization of the active catalyst particles is motivated by several advantages displayed by them, such as: Environmental stability, chemical inertness and resistance to ultraviolet radiations, mechanical stability, low prices and ease availability. Additionally, the use of polymer nanocomposites as photocatalysts offers the possibility of a facile separation and reuse of the materials, eliminating thus the post-treatment separation processes and implicitly reducing the costs of the procedure. This review covers the polymer-based photocatalytic materials containing the most popular inorganic nanoparticles with good catalytic performance under UV or visible light, namely TiO2, ZnO, CeO2, or plasmonic (Ag, Au, Pt, Pd) NPs. The study is mainly targeted on the preparation, photocatalytic activity, strategies directed toward the increase of photocatalytic efficiency under visible light and reuse of the hybrid polymer catalysts.

show abstract

“…Observou-se que a combinação de uma superfície de carbono amorfo melhorou a atividade fotocatalítica devido ao fenômeno de adsorção do composto orgânico a ser degradado. 167 Os óxidos metálicos semicondutores, tais como TiO 2 e ZnO, ainda apresentam muitas limitações na atividade fotocatalítica a partir da energia solar, por apresentarem um band gap elevado. Daí a importância de se trabalhar com sistemas híbridos e com modificações dos estados energéticos de superfície, via dopagem ou criando-se defeitos e estados de desordem.…”

Section: Uso De Qds Como Bloqueadores De Uv E Fotocatalisadoresunclassified

Pontos quânticos ambientalmente amigáveis: destaque para o óxido de zinco

Sandri¹,

Krieger²,

Costa³

et al. 2017

Quim. Nova

View full text Add to dashboard Cite

ENVIRONMENTALLY FRIENDLY QUANTUM DOTS: HIGHLIGHTING ZINC OXIDE. Semiconductor nanocrystals with sizes in the quantum confinement regime (2-10 nm) present special physical and chemical properties. Additionally, environment-friendly quantum dots (QDs), as zinc oxide and zinc sulfide, offer many practical usages. Herein the ZnO semiconductor nanocrystals properties will be preferentially explored, such as its luminescence, broad spectrum UV absorber and electronics performances, and therefore its multifunctionality, as well as its advantages compared to some toxics QDs. A review is carefully presented stressing some synthesis approaches for applications reasons toward devices, chemosensors, biological labels, UV-absorbers and photocatalysis. ZnO QDs have been used in combination with organic and other inorganic materials. Hybrid materials have many advantages compared to their individual contents leading to important contributions to science and technology. As a result, an important growth in material fields is noticeable.Keywords: ZnO quantum dots; environment-friendly quantum dots; photocatalysis; UV-blockers; size-dependent fluorescence emission. INTRODUÇÃOÉ notória a contribuição da nanotecnologia nas ciências biológi-cas, farmacêuticas e da saúde nestas últimas três décadas. Como resultado, tem-se observado uma oferta cada vez maior de novos materiais, inteligentes e funcionais, o melhoramento da qualidade de vida das pessoas e, consequentemente, um aumento na expectativa de vida. 1No início da década de 1980 apareceram os primeiros estudos para uma nova classe de nanocristais com capacidade de exibir propriedades espectroscópicas dependentes do tamanho, 2 advindas do efeito de confinamento quântico.3-5 O confinamento quântico é resultado da mudança da densidade dos estados eletrônicos, que por sua vez, está relacionada com a posição e momento para partículas livres e confinadas. Quando a energia e o momento são definidos, a posição destas partículas não pode ser definida com precisão. Se considerada a relação entre energia e momento para a fase sólida massiva, é como pensar que uma série de vibrações que ocorrem com pequenas diferenças de energia nesta fase serão comprimidas, gerando uma transição intensa e única em um ponto quântico (QD, do inglês quantum dot).5 Dita de outra maneira, com a redução do tamanho das partículas a excitação eletrônica é deslocada para regiões de maior energia e o oscilador fica com restrita capacidade de transição. A Figura 1 ilustra a densidade de estados partindo de um material massivo, tridimensional (a) e que, progressivamente, sofre o confinamento em uma das dimensões (b)-(d). 5QDs podem confinar transportadores de cargas e manter uma coerência de spin destes transportadores em um período de tempo maior que os correspondentes materiais massivos, característica essa fundamental para o desenvolvimento de tecnologia baseada em sistemas quânticos 6 e da manifestação de efeitos excitônicos expressivos, os quais dependem da forma e tamanho da estrutura de confinamento. 7A incidênc...

show abstract

Enhanced photocatalytic activity of C@ZnO core-shell nanostructures and its photoluminescence property

Cited by 40 publications

References 42 publications

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO₂–ZnO Heterostructures for Highly Improved Photocatalytic CO₂ Reduction

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO₂–ZnO Heterostructures for Highly Improved Photocatalytic CO₂ Reduction

Polymer Nanocomposites for Photocatalytic Applications

Pontos quânticos ambientalmente amigáveis: destaque para o óxido de zinco

Contact Info

Product

Resources

About

Enhanced photocatalytic activity of C@ZnO core-shell nanostructures and its photoluminescence property

Cited by 40 publications

References 42 publications

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO2–ZnO Heterostructures for Highly Improved Photocatalytic CO2 Reduction

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO2–ZnO Heterostructures for Highly Improved Photocatalytic CO2 Reduction

Polymer Nanocomposites for Photocatalytic Applications

Pontos quânticos ambientalmente amigáveis: destaque para o óxido de zinco

Contact Info

Product

Resources

About

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO₂–ZnO Heterostructures for Highly Improved Photocatalytic CO₂ Reduction

Surface Plasmonic Resonance and Z-Scheme Charge Transport Synergy in Three-Dimensional Flower-like Ag–CeO₂–ZnO Heterostructures for Highly Improved Photocatalytic CO₂ Reduction