Synthesis of yttrium and cerium doped ZnO nanoparticles as highly inexpensive and stable photocatalysts for hydrogen evolution

Ahmad, Irshad; Akhtar, Muhammad Shoaib; Manzoor, Mian Faisal; Wajid, Muhammad; Noman, Muhammad; Ahmed, Ejaz; Ahmad, Mahmood; Khan, Waheed Qamar; Rana, Anwar Manzoor

doi:10.1016/j.jre.2020.04.002

Cited by 49 publications

(16 citation statements)

References 24 publications

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“…Using eqn 1 given below, 3.37 and 2.76 eV were calculated as bandgaps for ZnO and CoO-ZnO, respectively, which show that incorporation of Co into the ZnO structure narrows the band gap. 35,36 Hence, CoO-ZnO can be employed as an effective visible light photocatalyst for the degradation of organic pollutants. [37][38][39] Bandgap ¼ 1240 Wavelength…”

Section: Resultsmentioning

confidence: 99%

Synthesis of a CoO–ZnO photocatalyst for enhanced visible-light assisted photodegradation of methylene blue

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Synthesis of a CoO–ZnO photocatalyst for enhanced visible-light assisted photodegradation of methylene blue

et al. 2022

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“…Unlike cerium, praseodymium in our HEOs tends to retain its initial oxidation state (+3), as it is in Pr-precursor. Pr 3+ can be easily stabilized by adjusting the size of the cation site during its ZnO [106] 0.36 3 wt% Y-ZnO [106] 2.57 3 wt% Ce-3 wt% Y-ZnO [106] 3.93 6.9…”

Section: Cementioning

confidence: 99%

Bandgap Engineering in Novel Fluorite‐Type Rare Earth High‐Entropy Oxides (RE‐HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications

Nundy

Tatar

Kojčinović

et al. 2022

Advanced Sustainable Systems

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Five different rare‐earth‐based nanocrystalline high entropy oxides (HEOs) with fluorite structure and average crystallite sizes between 6 and 8 nm are prepared and their photocatalytic behavior toward azo dye degradation and photoelectrochemical water splitting for hydrogen generation is examined. The cationic site in the fluorite lattice consists of five equimolar elements selected from the group of rare‐earth elements including La, Ce, Pr, Eu, and Gd and second‐row transition metals, Y and Zr. The studied HEOs exhibit bandgaps in the range from 1.91 to 3.0 eV and appropriate valence and conduction bands for water splitting. They reveal high photocatalytic activity that is mostly attributed to the accessibility of more photocatalytic active sites, which provide radicals responsible for the azo dye degradation. The materials successfully produce hydrogen by photocatalytic water splitting, suggesting the potential of HEOs as new photocatalysts. The photocatalytic performances of all studied HEOs outperform the single fluorite oxides or equivalent mixed oxides. The Ce0.2Zr0.2La0.2Pr0.2Y0.2O2 (CZLPY) engender hydrogen in 9.2 µmol mg−1 per hour that is much higher content than for pristine CeO2 material which amounts to 0.8 µmol mg−1 per hour.

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“…[18,24] In contrast, Ahamad et al observed a reduced crystallite size in the case of 3% yttrium-doped ZnO NPs derived from the combustion route. [25] Sujinnapram et al reported a decreased crystallite size of precipitation-derived yttrium-doped ZnO, attributing the interaction between Y 3þ ions and OH À ions is stronger than that of between Zn 2þ and OH À ions. [26] Belghiti et al also reported a reduced crystallite size of ZnO NPs in the low concentration Y 2 O 3 (1.0% and 1.5%) partially coated ZnO nanopowders.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Ultraviolet Band Absorption and Emission Features of ZnO Nanoparticles Through the Crystallite Size and Lattice Strain Modulation: Role of Yttrium Ions

Kumari

Nirmala

Chidhambaram

et al. 2022

Physica Status Solidi (b)

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Due to their unique characteristics, semiconductors have undergone a blooming revolution in recent decades. Among the multifarious semiconductor nanomaterials such as TiO 2 , SnO 2 , ZnO, ZrO 2 , CeO 2 , NiO, Fe 2 O 3 , In 2 O 3 , and ZnO paved a new way for the research community to explore the nanotechnology field. ZnO is a multipurpose II-VI group n-type semiconductor compound with remarkable chemical and thermal stabilities, a wide direct bandgap of 3.3 eV, a high exciton binding energy of 60 meV, and great level transparency at ambient temperature. [1][2][3] Further, ZnO possesses high thermal and chemical stability. [4] The aforementioned characteristics show that ZnO is a highly alluring material with a wide range of applications, including solar cells, lightemitting diodes, piezoelectric devices, laser diodes, thin-film resistors, sensors, paints, photocatalysts, and antibacterial agents. [5][6][7][8][9][10][11] ZnO is an amphoteric oxide and naturally crystallizes in a hexagonal wurtzite structure with space group P6 3mc . It is highly active under ultraviolet light irradiation that limits its usage in the region. [3] Metal ion-doped semiconductors tune the bandgap, structural modification, and alter the luminescent properties of ZnO. Recently, the research community has piled up their core interest in doping ZnO with rare earth elements in particular Y, Sc, Eu, Tb, etc. because of their localized, partially occupying 4f electrons that emphasize the transmittance performance in the visible region and minimizes the natal point defect densities in ZnO. [12,13] It is observed that the Sc-doped ZnO increases visible light wavelength transmittance, Eu-doped ZnO serves as an ideal photocatalytic agent, and Y-doped ZnO enhances the luminescent properties of ZnO. [12,14,15] Among the various RE elements cited above, Y is more significant as the atomic radius is greater than that of Zn, and several oxygen voids emerge due to the phase segregation of Y 3þ ions. [1] The current research work involves the synthesis of REM ion Y-doped ZnO nanoparticles (NPs) with various concentrations of yttrium by a simple co-precipitation method. Several analytical techniques were deployed to investigate the modification of structural, optical, surface

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Synthesis of yttrium and cerium doped ZnO nanoparticles as highly inexpensive and stable photocatalysts for hydrogen evolution

Cited by 49 publications

References 24 publications

Synthesis of a CoO–ZnO photocatalyst for enhanced visible-light assisted photodegradation of methylene blue

Synthesis of a CoO–ZnO photocatalyst for enhanced visible-light assisted photodegradation of methylene blue

Bandgap Engineering in Novel Fluorite‐Type Rare Earth High‐Entropy Oxides (RE‐HEOs) with Computational and Experimental Validation for Photocatalytic Water Splitting Applications

Tailoring Ultraviolet Band Absorption and Emission Features of ZnO Nanoparticles Through the Crystallite Size and Lattice Strain Modulation: Role of Yttrium Ions

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