Enhanced H 2 S Sensing Performance of a p -type Semiconducting PdO-NiO Nanoscale Heteromixture

Balamurugan, C.; Jeong, Yun-Jin; Lee, D.W.

doi:10.1016/j.apsusc.2017.05.166

Cited by 35 publications

(7 citation statements)

References 49 publications

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“…In PdO–NiO mixed metal oxide, The intense diffraction peaks at 2θ = 37.16, 43.24, 62.81, 75.32 and 79.34° indexed to (101), (012), (110), (113) and (202) planes of the cubic phase of NiO, which is highly consistent with standard JCPDS NO: 01-071-4751 20 . On the other hand, the sharp peaks at 2θ = 34.54 and 55.79° indexed to (101) and (112) planes corresponding to the tetragonal crystalline phase of PdO with an average lattice parameter 3.043 Å, which is highly associated with standard JCPDS NO: 043-1024 21 . Interestingly, metallic diffraction peaks and other impurity phases were not observed in the hybrid PdO–NiO nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

Highly efficient and simultaneous catalytic reduction of multiple toxic dyes and nitrophenols waste water using highly active bimetallic PdO–NiO nanocomposite

Ramu

Choi

2021

Sci Rep

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Azo dyes and nitrophenols have been widely used in the various industry which are highly toxic and affecting the photosynthetic cycle of aquatic organism. The industry disposals increase the accumulation of azo compounds in the environment. In the present study, we synthesized the low cost, PdO-doped NiO hetero-mixture via simple hydrothermal combined calcination process. The morphology results proved that, the spherical PdO nanoparticles are evenly doped with NiO nanoparticles. The band gap values of metal oxides NiO, PdO and PdO–NiO composite were found to be 4.05 eV, 3.84 eV and 4.24 eV, respectively. The high optical bandgap (Eg) value for composite suggests that the PdO interface and NiO interface are closely combined in the composite. The catalytic activity of the PdO–NiO was analyzed for the reduction of different toxic azo compounds namely, 4-nitrophenol (NP), 2,4-dinitrophenol (DNP), 2,4,6-trinitrophenol (TNP), methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) separately and their mixture with the presence of a NaBH4. For the first time, the large volume of the toxic azo compounds was reduced into non-toxic compounds with high reduction rate. The proposed PdO–NiO catalyst exhibit excellent rate constant 0.1667, 0.0997, 0.0686 min−1 for NP, DNP and TNT and 0.099, 0.0416 and 0.0896 min−1 for MB, RhB and MO dyes respectively which is higher rate constant than the previously reported catalysts. Mainly, PdO–NiO completes the reduction of mixture of azo compounds within 8 min. Further, PdO–NiO exhibit stable reduction rate of azo compounds over five cycles with no significant loss. Hence, the proposed low cost and high efficient PdO–NiO catalyst could be the promising catalyst for degradation of azo compounds.

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Section: Resultsmentioning

confidence: 99%

Highly efficient and simultaneous catalytic reduction of multiple toxic dyes and nitrophenols waste water using highly active bimetallic PdO–NiO nanocomposite

Ramu

Choi

2021

Sci Rep

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“…Herein, the green emission with a shorter wavelength of 493 nm represents the oxygen vacancy (O v ) and oxygen antisite (O Ti ); the yellow emission peak found at 585 nm has been associated with interstitial oxygen (O i ). Further, the red emission peak at 613 nm may denote different vacancy states such as titanium interstitial to titanium vacancies, titanium interstitial to oxygen interstitial, and titanium interstitial to oxygen vacancies. , …”

Section: Resultsmentioning

confidence: 99%

Effects of Hydrogen Treatment and Nb₂O₅ Nanoparticle Decoration in TiO₂Nanorods for Solar Water Oxidation

Arunachalam

Gao

Yun

et al. 2019

ACS Sustainable Chem. Eng.

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Herein, we studied the crucial role of Nb 2 O 5 nanoparticles on hydrothermally grown TiO 2 nanorod (TNR) photoelectrodes for photoelectrochemical reactions utilizing hydrogen and oxygen fuels in water. The synthetic TNR arrays showed a diameter and length of ∼150 nm and 2.4 μm, respectively, whereas the Nb 2 O 5 -coated TNR arrays modulated by the concentration (0.05, 0.5, or 0.9 M) of the Nb 2 O 5 precursor were composed of the widely distributed Nb 2 O 5 nanoparticles through the entire surface area of the TNR. Increasing the concentration of the Nb 2 O 5 precursor enhanced the density of the Nb 2 O 5 nanoparticles coated on TNR arrays. The Nb 2 O 5 (0.05 M)-coated TNR film showed quite a high photocurrent density (J) of ∼1.1 mA/cm 2 at 1.23 V vs RHE (abbreviated as 1.23 V RHE ) compared with ∼0.85 mA/cm 2 of the intrinsic TNR due to efficient charge separation as well as reduction in charge recombination at the interface between the outer surface and the electrolyte. These phenomena were supported by photoluminescence spectra, revealing the rapid decay of the Nb 2 O 5 (0.05 M)-coated TNR photoelectrode offering direct information on the reduction of the charge recombination process. Furthermore, the hydrogen annealing process on the Nb 2 O 5 -coated TNR film shows a rapid increase in J of ∼2.58 mA/cm 2 at 1.23 V RHE , approaching nearly above 1 order of magnitude enhancement compared with the intrinsic Nb 2 O 5 -coated TNR. These results may be attributed to the enhanced donor density preventing the formation of deep trap states and resulting in improved PEC performance. KEYWORDS: Nb 2 O 5 -coated TiO 2 nanorods, Hydrogen treatment, Photoelectrochemical (PEC) water splitting

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“…There have been many reports on Suzuki coupling reaction which proposing that the catalytic active site is a pd(0) species, and in cases where Pd(II) is applied this is the general believe that in situ reduction of Pd(II) to Pd(0) occurs during the reaction. On the basis of this mechanism, in catalytic systems where Pd and PdO and sometimes promoters such as NiO are present simultaneously, the conversion between PdO and Pd is the starting point in the Suzuki coupling reaction, and this has been stated as the equilibrium between PdO and Pd nanoparticles in the most of the published works up to date, and the presence of O 2 in the reaction media prevents the formation of Pd(0) with a tendency to agglomeration by shifting the equilibrium toward Pd(II) . Elaboration of this point of view might be informative because the nature of active sites on Pd for oxidative addition of aryl halide has remained as a subject of debates despite extensive research on the Suzuki‐Miyaura coupling reaction.…”

Section: Resultsmentioning

confidence: 99%

A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction

Taheri

Ghiaci

Shchukarev

2018

Applied Organom Chemis

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When a single metal fails to promote an efficient Suzuki-Miyaura coupling reaction at ambient temperature, the synergistic cooperation of two distinct metals might improve the reaction. To examine the synergistic effect of palladium and nickel for catalyzing Suzuki coupling reaction, g-C 3 N 4 supported metal nanoparticles of PdO, NiO and Pd-PdO-NiO were prepared, characterized and their catalytic activities evaluated over different aryl halides at room temperature and 78°C.The morphological characterization of Pd-PdO-NiO/g-C 3 N 4 demonstrated that the bimetallic particles were uniformly dispersed over the g-C 3 N 4 layers with diameters ranging from 3.5-7.7 nm. XPS analysis showed that nanoparticles of Pd-PdO-NiO consisted of Pd(II), Pd(0) and Ni(II) sites. The experiments performed on the catalytic activity of Pd-PdO-NiO/g-C 3 N 4 showed that the prepared catalyst demonstrated an efficient activity without using toxic solvents.

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Enhanced H 2 S Sensing Performance of a p -type Semiconducting PdO-NiO Nanoscale Heteromixture

Cited by 35 publications

References 49 publications

Highly efficient and simultaneous catalytic reduction of multiple toxic dyes and nitrophenols waste water using highly active bimetallic PdO–NiO nanocomposite

Highly efficient and simultaneous catalytic reduction of multiple toxic dyes and nitrophenols waste water using highly active bimetallic PdO–NiO nanocomposite

Effects of Hydrogen Treatment and Nb₂O₅ Nanoparticle Decoration in TiO₂Nanorods for Solar Water Oxidation

A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction

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Enhanced H 2 S Sensing Performance of a p -type Semiconducting PdO-NiO Nanoscale Heteromixture

Cited by 35 publications

References 49 publications

Highly efficient and simultaneous catalytic reduction of multiple toxic dyes and nitrophenols waste water using highly active bimetallic PdO–NiO nanocomposite

Highly efficient and simultaneous catalytic reduction of multiple toxic dyes and nitrophenols waste water using highly active bimetallic PdO–NiO nanocomposite

Effects of Hydrogen Treatment and Nb2O5 Nanoparticle Decoration in TiO2Nanorods for Solar Water Oxidation

A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction

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Product

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Effects of Hydrogen Treatment and Nb₂O₅ Nanoparticle Decoration in TiO₂Nanorods for Solar Water Oxidation