Macroscopic Polarization Enhancement Promoting Photo‐ and Piezoelectric‐Induced Charge Separation and Molecular Oxygen Activation

Huang, Hongwei; Tu, Shuchen; Zeng, Chao; Zhang, Tierui; Reshak, A. H.; Zhang, Yihe

doi:10.1002/ange.201706549

Cited by 108 publications

(61 citation statements)

References 28 publications

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“…O 2 , · OH, singlet oxygen ( 1 O 2 ), peroxyl (RO 2 . ), and alkoxyl (RO − ) are highly active in photochemical reactions such as photodegradation of organic pollutants 40 . Among the all ROS, superoxide (O 2 . )…”

Section: Resultsmentioning

confidence: 99%

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Vavilapalli

Banik

Peri

et al. 2020

Sci Rep

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ca 2 fe 2 o 5 (cfo) is a potentially viable material for alternate energy applications. incorporation of nitrogen in ca 2 fe 2 o 5 (CFO-N) lattice modifies the optical and electronic properties to its advantage. Here, the electronic band structures of cfo and cfo-n were probed using Ultraviolet photoelectron spectroscopy (UPS) and UV-Visible spectroscopy. The optical bandgap of CFO reduces from 2.21 eV to 2.07 eV on post N incorporation along with a clear shift in the valence band of CFO indicating the occupation of N 2p levels over O 2p in the valence band. Similar effect is also observed in the bandgap of CFO, which is tailored upto 1.43 eV by N + ion implantation. the theoretical bandgaps of cfo and cfo-n were also determined by using the Density functional theory (Dft) calculations. the photoactivity of these CFO and CFO-N was explored by organic effluent degradation under sunlight. The feasibility of utilizing cfo and cfo-n samples for energy storage applications were also investigated through specific capacitance measurements. The specific capacitance of CFO is found to increase to 224.67 Fg −1 upon n incorporation. cfo-n is thus found to exhibit superior optical, catalytic as well as supercapacitor properties over cfo expanding the scope of brownmillerites in energy and environmental applications.Multifunctional brownmillerite Ca 2 Fe 2 O 5 is a promising material for energy and environmental applications such as fuel cells, supercapacitors, batteries, H 2 production and CO 2 capture, attributed mostly to its multifaceted property like those in catalysis and mixed ionic electronic conduction (MIEC) 1-5 . Presence of a visible region bandgap along with its catalytic activity also enables it as a photoactive material and most importantly as material for textile waste water remediation. There is a huge need for industrial waste water purification of the effluents from the textile industries before releasing it to water bodies. A lower cost and energy requirement pushes us to explore more efficient materials which can absorb a larger percentage of incident natural sunlight and make their impact felt on the environment 6-10 . Well known wide band gap semiconductors, such as TiO 2 and ZnO (bandgap > 3 eV), cannot perfectly match the broad ranges of solar radiation emphasizing the need to investigate new materials/composites with narrow bandgap 11 . Quite recently perovskite metal oxides, such as PbTiO 3 (2.75 eV), AgNbO 3 (2.86 eV), SrNbO 3 (1.9 eV), BiFeO 3 (2.1 eV), LaFeO 3 (2.4 eV), LaNiO 3 (2.42 eV) have been found to possess reasonable catalytic efficiency [12][13][14][15][16][17][18][19] . This encourages us to work with novel materials like oxygen deficient perovskites for sunlight-driven photocatalysis.To meet the above objectives, it is desirable to modify such structures with transition metal-N x active sites to enhance the charge transport features and hence the catalytic activity towards remediation of industrial wastewater 20,21 . Recently, Nitrogen-doped layered perovskite K 2 La 2 Ti 3 O 10 was sh...

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Section: Resultsmentioning

confidence: 99%

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Vavilapalli

Banik

Peri

et al. 2020

Sci Rep

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“…The overall photo catalytic degradation is depends on the light degradation ability of the composite and separation of excited electron hole pair [42]. According to the above discussion, CBMO produce conduction band via photo catalytic method obviously increases the degradation ability of the composite and generates the separation of photo generated electronshole pair; hence a considerable photo catalytic activity [43] is achieved. The possible mechanism may be given as follows 2 + e − + 2H + → 2OH ⋅ (Free radical formation) The predicted mechanism for the degradation of MB and MO onto CBMO is given in the Fig.…”

Section: Proposed Mechanism For the Degradation Of Methylene Blue Andmentioning

confidence: 98%

Photo catalytic degradation of methylene blue and methyl orange from aqueous solution using solar light onto chitosan bi-metal oxide composite

Makeswari

Saraswathi²

2020

SN Appl. Sci.

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Chitosan bi-metal oxide (CBMO) is prepared by co-precipitation method to determine the degradation ability of methylene blue (MB) and methyl orange (MO) dyes using solar light irradiation. The characteristics of CBMO are studied by FTIR, UV, SEM, EDX and XRD studies. The photocatalytic degradation of studies MB and MO were carried out by varying the parameters such as pH, irradiation time, dye concentration, composite dosage. The photo catalytic study shows the maximum percentage of degradation at pH 8 for MB and 3 for MO at irradiation time of 120 min and 0.15 g of CBMO and is confirmed by UV spectral studies. Based on the equilibrium data value Langmuir isotherm is well fitted, which indicates the formation of strong monolayer and it obeys pseudo second order kinetic model. Among methylene blue and methyl orange dyes, methyl orange was highly degraded (74.05%) by the chitosan-bimetal oxide adsorbent. And also 62.05% of dyes can be removed from industrial waste water by CBMO. According to the experimental results it is clearly evident that the chitosan-bimetal oxide composite is expected to be an effective product for the remediation of dyes from waste water.

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“…O 2 − ) (Eq. 3) 57 . Simultaneously, to maintain electroneutrality, the photosensitized holes from T-ZnO are injected into the valence band of CNOs (Eq.…”

Section: Photocatalytic Degradation Of Dnpmentioning

confidence: 99%

Visible-light photocatalysis by carbon-nano-onion-functionalized ZnO tetrapods: degradation of 2,4-dinitrophenol and a plant-model-based ecological assessment

et al. 2019

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The visible-light-induced photocatalytic performance of a three-dimensional (3D) hybrid composite based on carbon nano-onion (CNO)-functionalized zinc-oxide tetrapods (T-ZnO) was investigated to study the photocatalytic degradation of 2,4-dinitrophenol (DNP). The hybrid CNO-functionalized T-ZnO 3D composite was successfully developed via a facile one-step process. The CNOs, synthesized via a green route from flaxseed oil, were decorated on the surface of T-ZnO via chemical mixing. Such a hybrid composite allows for the complete optimization of the T-ZnO/ CNO interface to enhance visible-light harvesting, contributing to effective visible-light-induced photocatalysis. The enhanced photocatalytic performance of the T-ZnO-CNO 3D composite is attributed to the strong synergistic effects obtained by the unique cumulative intrinsic properties of CNOs and the 3D architecture of T-ZnO, which lead to exceptional charge transfer and separation. A reaction mechanism for the degradation of DNP is proposed based on a bandgap analysis and trapping experiments. Furthermore, the photocatalyst maintains a favorable reusability during consecutive cycling experiments. The ecological assessment of the photocatalytic process was performed via the germination of common gram seeds (Cicer arietinum) and reveals the low toxicity and environmental safety of the synthesized hybrid 3D composite. The observations confirm that the synthesized hybrid 3D composite facilitates wastewater decontamination using photocatalytic technology and highlights the broad implications of designing multifunctional materials for various advanced applications.

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Macroscopic Polarization Enhancement Promoting Photo‐ and Piezoelectric‐Induced Charge Separation and Molecular Oxygen Activation

Cited by 108 publications

References 28 publications

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Photo catalytic degradation of methylene blue and methyl orange from aqueous solution using solar light onto chitosan bi-metal oxide composite

Visible-light photocatalysis by carbon-nano-onion-functionalized ZnO tetrapods: degradation of 2,4-dinitrophenol and a plant-model-based ecological assessment

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