Black TiO<sub>2</sub> inverse opals for visible-light photocatalysis

Xin, Linlin; Li, Xuefeng

doi:10.1039/c5ra10280d

Cited by 18 publications

(19 citation statements)

References 23 publications

(64 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…TiO 2 with interconnections between the pores. Single porous domains are present inside the material, in agreement with the morphology of other inverse opals prepared with the template method [8,9,25]. This macroporosity can be claimed to explain the increased photoactivity, as it can favour the mass transfer and consequently the reduction of H + ions on the surface of TiO 2 by the photogenerated electrons.…”

Section: Resultssupporting

confidence: 77%

“…Inverse opal (I.O.) TiO 2 was synthesized via a templating strategy using polystyrene (PS) spheres, obtained by free-surfactant emulsion polymerization, according to the method previously reported in the literature [8,9,25]. Briefly, after the formation of the PS spheres the following steps consisted of an infiltration procedure with a solution of titanium isopropoxide, drying for 24 h and calcining at 550°C for 12 h (heating ramp of 2°C/min) leading to the formation of the inverse opal TiO 2 structure through the removal of the PS template.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…In particular, mesoporous structures have been studied due to their large accessible surface area and well defined uniform pore size and intrinsic connectivity, which favour an efficient charge carrier transfer and mass flow of the reactants [6,7]. In this contest, three-dimensional inverse opal structures prepared by template strategy were recently investigated as a promising class of photocatalysts with peculiar structure and macro-mesoporosity [8][9][10]. In these materials the particular porous backbone acts in fact as a photon trap, taking advantage also of the scattering effects [11,12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Photocatalytic H2 production over inverse opal TiO2 catalysts

2019

View full text Add to dashboard Cite

The influence of BiVO 4 and CuO on the chemico-physical properties of TiO 2-based systems is reported. The performances of these systems were investigated in the photocatalytic H 2 production both under UV and solar light irradiation. The characterization data pointed out that the obtained TiO 2 samples have highly porous inverse opal structures with interconnected macropores. Inverse opal TiO 2 exhibited higher activity in the H 2 production than the commercial TiO 2 due to the peculiar porosity that allows photons to enter inside the photocatalyst. A further improvement in terms of photoactivity was verified by addition of increasing amounts of BiVO 4. On the contrary a small CuO content was found to be the optimal one for the inverse opal TiO 2-CuO composites. In fact, due to surface segregation effects, a higher amount of CuO can partially keep the light radiation away from the TiO 2 surface active sites, thus decreasing drastically the absorption of photons. The combination of the benefits of the highly ordered porous TiO 2 structure and the presence of BiVO 4 or small amounts of CuO can represent a promising strategy towards efficient photocatalytic H 2 production.

show abstract

Section: Resultssupporting

confidence: 77%

Section: Catalyst Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic H2 production over inverse opal TiO2 catalysts

2019

View full text Add to dashboard Cite

show abstract

“…[9,13] Recently,C hen and co-workers demonstrated excellent visible-light photocatalytic performance in water splitting on black,e lectron deficient anatasen anoparticles,d erived from the hydrogenation of TiO 2 ,w hich opens up new possibilities for tuning of the TiO 2 band structure. [19] Af ew methods have been adopted for the synthesis of black TiO 2 materials, [20][21][22][23][24][25] but not many have been used to fabricate hierarchical architectures. [7,26,27] The exact workingm echanism of the black TiO 2 is also under debate.…”

Section: Introductionmentioning

confidence: 99%

Black N/H‐TiO₂ Nanoplates with a Flower‐Like Hierarchical Architecture for Photocatalytic Hydrogen Evolution

Zhang

Zhou

et al. 2016

ChemSusChem

View full text Add to dashboard Cite

A facile two‐step strategy was used to prepare black of hydrogenated/nitrogen‐doped TiO2 nanoplates (NHTA) with a flower‐like hierarchical architecture. In situ nitriding and self‐assembly was realized by hydrothermal synthesis using tripolycyanamide as a N source and as a structure‐directing agent. After thorough characterization, it was found that the hydrogenation treatment did not damage the flower‐like architecture but distorted the anatase crystal structure and significantly changed the band structure of NHTA owing to the increased concentration of oxygen vacancies, hydroxyl groups, and Ti3+ cations. Under AM 1.5 illumination, the photocatalytic H2 evolution rate on the black NHTA was approximately 1500 μmol g−1 h−1, which was much better than the N‐doped TiO2 nanoplates (≈690 μmol g−1 h−1). This improvement in the hydrogen evolution rate was attributed to a reduced bandgap, enhanced separation of the photogenerated charge carriers, and an increase in the surface‐active sites.

show abstract

“…The inverse opal structure possesses unique optical characteristics, thus making it applicable for a wide range of applications such as photovoltaics [1], Li-ion batteries [2], sensing [3], optical waveguide [4], and photocatalysis [5][6][7][8]. The definition of the inverse opal is self-explanatory, referring to a structure made by the inverse replica of opal.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Modification of Macroporous Titania using Silver Nanoparticles

Nursam

Tan

2018

J. Pure App. Chem. Res.

View full text Add to dashboard Cite

A synthesis method for preparing macroporous nitrogen and silver-modified titania via solgel route is presented. The addition of nitrogen and silver nanoparticles was carried out simultaneously with a hard templating technique using silica spheres packed into a threedimensional opal structure. The influence of such modifications on the optical and chemical properties of titania was evaluated using photocatalytic degradation under visible light. The macroporous opal templated samples in this work performed better than the commercial titania, Degussa P25. The highest photocatalytic enhancement, showing more than eight times higher activity than the non-modified titania, was achieved by the opal templated sample prepared with 1.0 mol % of silver. Although silver addition and macroporous templating enhanced the visible light activity, the most significant improvement was afforded by the utilization of the silica opal template that gave rise to the high surface area (>100 m 2 g-1) and promoted the surface charge interaction.

show abstract

Black TiO₂ inverse opals for visible-light photocatalysis

Cited by 18 publications

References 23 publications

Photocatalytic H2 production over inverse opal TiO2 catalysts

Photocatalytic H2 production over inverse opal TiO2 catalysts

Black N/H‐TiO₂ Nanoplates with a Flower‐Like Hierarchical Architecture for Photocatalytic Hydrogen Evolution

Synthesis and Modification of Macroporous Titania using Silver Nanoparticles

Contact Info

Product

Resources

About

Black TiO2 inverse opals for visible-light photocatalysis

Cited by 18 publications

References 23 publications

Photocatalytic H2 production over inverse opal TiO2 catalysts

Photocatalytic H2 production over inverse opal TiO2 catalysts

Black N/H‐TiO2 Nanoplates with a Flower‐Like Hierarchical Architecture for Photocatalytic Hydrogen Evolution

Synthesis and Modification of Macroporous Titania using Silver Nanoparticles

Contact Info

Product

Resources

About

Black TiO₂ inverse opals for visible-light photocatalysis

Black N/H‐TiO₂ Nanoplates with a Flower‐Like Hierarchical Architecture for Photocatalytic Hydrogen Evolution