Efficiently photoelectrocatalyze CO 2 to methanol using Ru(II)-pyridyl complex covalently bonded on TiO 2 nanotube arrays

Liu, Jibo; Shi, Huijie; Shen, Qi; Guo, Chenyan; Zhao, Guohua

doi:10.1016/j.apcatb.2017.03.060

Cited by 31 publications

(23 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microreactors also allow for exploring, at a reduced cost, a broad range of possible configurations: for instance, by varying the irradiation system (LED, optical fibers, solar light, etc.) or coupling photocatalysis with other techniquessuch as electrolysisit might be possible to increase reaction 2 yields or control the selectivity of a given product 15,16 . The use of these reactors for photocatalysis has been growing rapidly in recent years [17][18][19] , and has delivered promising results, achieving intensifications of more than two orders of magnitude over conventional scale reactors 20 .…”

Section: ◼ Introductionmentioning

confidence: 99%

Single-Phase Flow in a Micro-Structured Packed Bed Photo-Reactor: Effect of Packing Size on Flow Regime and on the Reactor Performance for Homogeneous Photocatalysis

Ramos

Couri²,

Teixeira³

2018

Preprint

View full text Add to dashboard Cite

Dedicated research on photochemical reactors is fundamental to the application of this technology to real-life problems. In line with this trend, we report a study of structural parameters of micro-structured packed bed reactors (μPBR) regarding their ability to promote intensification. We present an investigation on the effects of the size of spherical packings on the developed flow regime, and its implications for the performance of the reactor on a photochemical reaction in aqueous phase. Tubular reactors were built with combinations of borosilicate glass tubes of two diameters (20 and 30 mm) packed with soda-lime glass spheres of three average diameters (1.0, 3.0 and 6.0 mm), alumina spheres of 6.0 mm diameter, and polished iron spheres of 5.0 mm diameter. Residence Time Distributions (RTD) were measured for each combination of outer tube and glass sphere sizes. Results showed that as the packing size decreases, the observed flow regime becomes closer to an ideal PFR, suggesting that smaller packings are more suitable to applications that require precise control of residence time. The aqueous-phase oxidation of benzoic acid by oxygen radicals generated by UV-A irradiation of nitrite ions was used as model photochemical reaction. We also observed that increasing the D/d<sub>p</sub> ratio for narrower reactors faster specific reaction rates are achieved, suggesting that intensification is possible in these reactors; however, the overall yield decreases, probably due to increased photon loss. Lastly, we found that glass spheres can be replaced by alumina spheres with little loss in light-collection efficiency, indicating an attractive pathway for immobilized photocatalysis.

show abstract

Section: ◼ Introductionmentioning

confidence: 99%

Single-Phase Flow in a Micro-Structured Packed Bed Photo-Reactor: Effect of Packing Size on Flow Regime and on the Reactor Performance for Homogeneous Photocatalysis

Ramos

Couri²,

Teixeira³

2018

Preprint

View full text Add to dashboard Cite

show abstract

“…This is due to the notable depression of recombination of the photogenerated charge carriers on an epitaxial 3C-SiC film, whicha ctually benefits to the separation of electrons and holes. [18] This is highly desirable to improvephotocatalytic activity of 3C-SiC films.…”

Section: Resultsmentioning

confidence: 99%

“…The PL emission signal of an epitaxial 3C‐SiC film is significantly weaker than that of nanocrystalline and microcrystalline 3C‐SiC films. This is due to the notable depression of recombination of the photogenerated charge carriers on an epitaxial 3C‐SiC film, which actually benefits to the separation of electrons and holes . This is highly desirable to improve photocatalytic activity of 3C‐SiC films.…”

Section: Resultsmentioning

confidence: 99%

Epitaxial Cubic Silicon Carbide Photocathodes for Visible‐Light‐Driven Water Splitting

Han

Heuser

Tong

et al. 2020

Chemistry A European J

View full text Add to dashboard Cite

Cubic silicon carbide (3C‐SiC) material feature a suitable bandgap and high resistance to photocorrosion. Thus, it has been emerged as a promising semiconductor for hydrogen evolution. Here, the relationship between the photoelectrochemical properties and the microstructures of different SiC materials is demonstrated. For visible‐light‐derived water splitting to hydrogen production, nanocrystalline, microcrystalline and epitaxial (001) 3C‐SiC films are applied as the photocathodes. The epitaxial 3C‐SiC film presents the highest photoelectrochemical activity for hydrogen evolution, because of its perfect (001) orientation, high phase purity, low resistance, and negative conduction band energy level. This finding offers a strategy to design SiC‐based photocathodes with superior photoelectrochemical performances.

show abstract

“…The steps are based on the transfer of multiple photogenerated electrons (conversion to methanol requires six electrons) and also the formation of hydrogen radical relevant to produce hydrocarbon from carbon dioxide [28]. The literature has reported that p-n junction semiconductors can be a good alternative to enhance the photoelectrocatalytic performance [15,13,[29][30][31][32]. The heterojunction can enhance the separation of electron-hole pairs, since the charge transfer can be amplified by the Z-scheme mechanism [17,32], facilitating these multiple steps.…”

Section: Introductionmentioning

confidence: 99%

“…Another effect that has presented photoelectrocatalytic upgrade is the use of nanostructured materials [31,17,35]. Among the several possibilities of nanostructures, nanotubes are shown to be the most promisor semiconductor type due to the large surface area and their good electronic transport of the photogenerated electron/hole pairs, reducing the recombination and increasing the efficiency in the process [36,37].…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic performance of nanostructured p-n junction NtTiO2/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials

Brito

Hudari

Zanoni

2018

Journal of CO2 Utilization

View full text Add to dashboard Cite

Aiming a selective reduction of CO 2 to methanol, a p-n junction semiconductor was constructed based on CuO nanospheres (NsCuO) deposited at TiO 2 nanotubes (NtTiO 2). The NtTiO 2 /NsCuO material demonstrated smaller charge transfer resistance, smaller flat band potential and wider optical absorption when compared with NtTiO 2 and/or Ti/TiO 2 nanoparticles coated by higher size particles of CuO (Ti/TiO 2 /CuO). The selective reduction of dissolved CO 2 to methanol was promoted at lower potential of +0.2 V and UV-vis irradiation in 0.1 mol L −1 K 2 SO 4 electrolyte pH 8 with 57% of faradaic efficiency. Even though the performance of the nanostructured material NtTiO 2 /NsCuO was similar to the non-completely nanostructured material Ti/TiO 2 /CuO (0.1 mmol L −1 methanol), the conversion to methanol has been significantly increased when hydroxyls (0.62 mmol L −1) and holes scavengers (0.71 mmol L −1), such as p-nitrosodimethylaniline (RNO) or glucose, respectively, were added in the supporting electrolyte. It indicates that photogenerated electron/hole pairs are spatially separated on p-n junction electrodes, which produces effective electrons and long-life holes, influencing the products formed in the reaction. A schematic representation of the heterojunction effect on the photoelectrocatalytic CO 2 reduction is proposed under the semiconductor and each supporting electrolyte, which improves the knowledge about the subject.

show abstract

Efficiently photoelectrocatalyze CO 2 to methanol using Ru(II)-pyridyl complex covalently bonded on TiO 2 nanotube arrays

Cited by 31 publications

References 63 publications

Single-Phase Flow in a Micro-Structured Packed Bed Photo-Reactor: Effect of Packing Size on Flow Regime and on the Reactor Performance for Homogeneous Photocatalysis

Single-Phase Flow in a Micro-Structured Packed Bed Photo-Reactor: Effect of Packing Size on Flow Regime and on the Reactor Performance for Homogeneous Photocatalysis

Epitaxial Cubic Silicon Carbide Photocathodes for Visible‐Light‐Driven Water Splitting

Photoelectrocatalytic performance of nanostructured p-n junction NtTiO2/NsCuO electrode in the selective conversion of CO2 to methanol at low bias potentials

Contact Info

Product

Resources

About