Photocatalytic Conversion of Carbon Dioxide Using Zn–Cu–Ga Layered Double Hydroxides Assembled with Cu Phthalocyanine: Cu in Contact with Gaseous Reactant is Needed for Methanol Generation

Kawamura, Shogo; Ahmed, Naveed; Cârjă, Gabriela; Izumi, Yasuo

doi:10.2516/ogst/2015020

Cited by 10 publications

(9 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ag/Zn 3 Ga LDH and Cu phthalocyanine tetrasulfonate (PcTs)-doped Zn 3 Ga LDH were active irradiated by visible light (λ > 420 nm; total formation rate 0.12 and 0.15 μmol h −1 g cat −1 , respectively) (57,58). The mechanism could be explained by the electron shift due to SPR in Ag to wide-BG Zn 3 Ga LDH then to CO 2 -derived species (Scheme 3, right) and electron shift from wide-band gap Zn 3 Ga LDH to LUMO of CuPcTs then to CO 2 -derived species (Scheme 4).…”

Section: Photon Energy Conversion Of Co 2 To Fuels With Hydrogenmentioning

confidence: 99%

“…WO 3 was used for the photooxidation of water, whereas Zn-Cu-Ga LDH was used for the photoreduction of CO 2 . Protons and electrons, which were formed on WO 3 under the flow of moisture (solid-gas interface mode; Figure 9B), were used on Zn-Cu-Ga LDH instead of reactant H 2 in Photon energy conversion of CO 2 to fuels with hydrogen or sacrificial reducing agent, section 1 (56)(57)(58)60). For this process, photocatalysts pressed on both sides of the PE film were irradiated by UV-visible light through quartz windows and through the space in carbon electrode plates set for both gas flow and light transmission.…”

Section: Photon Energy Conversion Of Co 2 To Fuels Using Combination mentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances (2012–2015) in the Photocatalytic Conversion of Carbon Dioxide to Fuels Using Solar Energy: Feasibilty for a New Energy

Izumi

2015

ACS Symposium Series

Self Cite

View full text Add to dashboard Cite

In this chapter, recent advances in photocatalytic CO 2 conversion with water and/or other reductants are reviewed for the publications between 2012 and 2015. Quantitative comparisons were made for the reaction rates in μmol h −1 g cat −1 to acertain the progress of this field although the rates depends on photocatalyst conditions and reaction conditions (temperature, pressure, and photon wavelength and flux). TiO 2 photoproduced methane or CO from CO 2 and water at rates of 0.1-17 μmol h −1 g cat −1 depending on the crystalline phase, crystalline face, and the defects. By depositing as minimal thin TiO 2 film, the rates increased to 50-240 μmol h −1 g cat −1 . Gaseous water was preferred rather than liquid water for methane/CO formation as compared to water photoreduction to H 2 . Pt, Pd, Au, Rh, Ag, Ni, Cu, Au 3 Cu alloy, I, MgO, RuO 2 , graphene, g-C 3 N 4 , Cu-containing dyes, and Cu-containing metal-organic frameworks (MOFs) were effective to assist the CO 2 photoreduction using TiO 2 to methane (or CO, methanol, ethane) at rates of 1.4-160 μmol h −1 g cat −1 . Metals of greater work function were preferred. By depositing as minimal thin photocatalyst film, the rates increased to 32-2200 μmol h −1 g cat −1 . The importance of crystal face of TiO 2 nanofiber was suggested. As for semiconductors other than TiO 2 , ZnO, Zn 6 Ti layered double hydroxide (LDH), Mg 3 In LDH, KTaO 3 , AgBr, carbon nanotube, and the composites of these were reported to form methane, CO, methanol, acetaldehyde from CO 2 and water at rates of 0.15-300 μmol h −1 g cat −1 that were comparable to rates using promoted TiO 2 . The band energy designs comprising appropriate conduction band for CO 2 reduction and valence band for water oxidation were made progresses in these semiconductors and semiconductor junctions in the three years. If H 2 was used as a reductant, Ni/SiO 2 -Al 2 O 3 formed methane at 423 K under pressurized CO 2 + H 2 at a rate of 55 mmol h −1 g cat −1 . This rate was not enabled by heating the system under dark, suggesting photoactivated reaction followed by thermally-assisted reaction(s) via Ni-H species. As pure photocatalytic reactions from CO 2 + H 2 , methanol formation rates were improved up to 0.30 μmol h −1 g cat −1 by the doping of Ag/Au nanoparticles, [Cu(OH) 4 ] 2− anions, and Cu-containing dyes to Zn-Ga LDH. Furthermore, sacrificial reductants, e.g. hydrazine, Na 2 SO 3 , methanol, triethanol amine, and triethyamine, were also utilized to form CO, formate, and methanol at rates of 20-2400 μmol h −1 g cat −1 using semiconductor or MOF photocatalysts. Finally, similar to the integrated system of semiconductor photocatalyst for water oxidation and metal complex/enzyme catalyst for CO 2 (photo)reduction, two semiconductors (WO 3 , Zn-Cu-Ga LDH) were combined on both side of proton-conducting polymer to form methanol at a rate of 0.05 μmol h −1 g cat −1 from CO 2 and moisture. These promotion of photoconversion rates of CO 2 and new photocatalysts found in these three years have indicated the way beyond for a new...

show abstract

Section: Photon Energy Conversion Of Co 2 To Fuels With Hydrogenmentioning

confidence: 99%

Section: Photon Energy Conversion Of Co 2 To Fuels Using Combination mentioning

confidence: 99%

Recent Advances (2012–2015) in the Photocatalytic Conversion of Carbon Dioxide to Fuels Using Solar Energy: Feasibilty for a New Energy

Izumi

2015

ACS Symposium Series

Self Cite

View full text Add to dashboard Cite

show abstract

“…[5] Thed opingo fL DHsb yA go rA un anoparticles and phthalocyanines can boost the visible-light-only photoconversion of CO 2 into methanol and CO effectively. [6,7] In contrast, Ni-Al LDH;L DHs with M II = Ni, Mg, Zn and M III = Al, Ga, In;a nd Zn-Al LDH produced mainlyC O, [8][9][10][11][12] whereas Zn-Cu-Al and Ni-Cu-Al LDHs produced methane [13] and formic acid, formaldehyde, and methanol, [14] respectively,f rom CO 2 in liquid water [8][9][10][11]14] or moisture. [12,13] Thed iffusion of photogenerated electrons to CO 2 -derived species in LDHsw as monitored by using X-ray absorption fine structure analysis (XAFS) and FTIR spectroscopy; [15] however, the origin of selective methanol production over the Zn-Ga LDH from CO 2 and H 2 is still unclear.…”

Section: Introductionmentioning

confidence: 99%

“…(2)]. [3][4][5][6][7]15] Them etal ion profile of the cationic layers and the type of interlayer anions were varied, and the mechanism of selective methanol formation is discussedb elow.…”

Section: Introductionmentioning

confidence: 99%

Selective Photoconversion of Carbon Dioxide into Methanol Using Layered Double Hydroxides at 0.40 MPa

et al. 2017

Self Cite

View full text Add to dashboard Cite

CO2 photoconversion is a promising method to reduce atmospheric CO2 concentrations and mitigate energy problems simultaneously. Among the various efficient and stable semiconductor photocatalysts used for this purpose, layered double hydroxides (LDHs) have attracted attention as catalysts for CO2 photoconversion into CO and/or methanol. In this study, various LDHs of the formula [MII3GaIII(OH)8]2A⋅m H2O (MII=ZnII, CuII; A2−=CO32−, [Cu(OH)4]2−) were synthesized and used for CO2 photoconversion at a reaction pressure of 0.40 MPa in the presence of H2 to result in the exclusive production of methanol. Furthermore, the pretreatment of carbonate‐type LDHs at 423 K boosted the reaction rates by a factor of 7.5–20. Interestingly, [Zn3Ga(OH)8]2CO3⋅m H2O was the only LDH that produced methane primarily by an eight‐electron reduction (rather than the production of methanol by a six‐electron reduction) at a total formation rate of 2.7 μmol h−1 gcat−1 after it was preheated at 423 K and protected by an Ar atmosphere. Conversely, the methanol photogeneration rates of tetrahydroxycuprate‐type LDHs were suppressed to less than 0.1 μmol h−1 gcat−1 at 0.40 MPa. In summary, the contribution of the interlayer reaction space created by the partial removal of water molecules and/or carbonate ions of LDHs was suggested.

show abstract

“…The TiO 2 layers on the anodes were sensitized using anthocyanidin-type organic dyes (Scheme a), such as pelargonidin, delphinidin, and cyanidin (Scheme b–d). , These dyes present colors between purple and orange and absorption peaks of the complementary color range between 532 and 553 nm (Scheme b–d and Figure ). These absorptions are due to HOMO–LUMO electronic transitions . As a result, organic dyes work as an enhancer, increasing the electron flow from the anode and simultaneously suppressing the diffusion overvoltage within the photocatalyst layer.…”

Section: Introductionmentioning

confidence: 99%

Solar Cell with Photocatalyst Layers on Both the Anode and Cathode Providing an Electromotive Force of Two Volts per Cell

Urushidate

Matsuzawa

Nakatani

et al. 2018

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Solar cells and fuel cells are essential devices that convert sustainable energy into electricity. However, the electromotive forces they provide are in principle limited to less than 1 V, and consequently, they need to be connected in series for practical use. In this study, photocatalyst layers with thicknesses of 0.8–2.1 μm were applied to both electrodes. The primary particle size of TiO2 was optimized (15–21 nm), and its performance was further improved by doping with organic dyes, e.g., anthocyanins. The electron conductivity of TiO2 was found to be a primary factor in the performance of the cells, but the film flatness also reduced resistance and improved cell performance. Interestingly, the efficiency of TiO2 could be evaluated based on the exchangeable surface O atoms via its 18O2 exchange tests to suppress the reverse reaction step in water photo-oxidation, which occurs on the anode. UV and visible light were absorbed by TiO2 and the organic dyes, respectively, creating an electron flow path from the valence band to the conduction band of TiO2, then, the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO) of the organic dyes, then the anode, and finally the cathode via the external circuit. The flow of electrons and holes (separated from electrons in BiOCl on the cathode by UV–visible light) enabled a V OC value of 2.11 V and maximum power of 73.1 μW cm–2.

show abstract

Photocatalytic Conversion of Carbon Dioxide Using Zn–Cu–Ga Layered Double Hydroxides Assembled with Cu Phthalocyanine: Cu in Contact with Gaseous Reactant is Needed for Methanol Generation

Cited by 10 publications

References 35 publications

Recent Advances (2012–2015) in the Photocatalytic Conversion of Carbon Dioxide to Fuels Using Solar Energy: Feasibilty for a New Energy

Recent Advances (2012–2015) in the Photocatalytic Conversion of Carbon Dioxide to Fuels Using Solar Energy: Feasibilty for a New Energy

Selective Photoconversion of Carbon Dioxide into Methanol Using Layered Double Hydroxides at 0.40 MPa

Solar Cell with Photocatalyst Layers on Both the Anode and Cathode Providing an Electromotive Force of Two Volts per Cell

Contact Info

Product

Resources

About