Structural and thermal properties of pure and chromium doped zinc oxide nanoparticles

Worku, Ababay Ketema; Ayele, Delele Worku; Habtu, Nigus Gabbiye; Melas, Getu Alemayehu; Yemata, Temesgen Atnafu; Mekonnen, Negese Yayu; Teshager, Minbale Admas

doi:10.1007/s42452-021-04682-6

Cited by 40 publications

(19 citation statements)

References 59 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption peaks showed at ~3457 and 1643 cm −1 indicate the stretching and bending vibration mode of O-H as a result of water molecule adsorbed on the prepared sample surface. Moreover, the FTIR peak at ~473 cm −1 indicates the stretching vibrational mode of the Zn-O bond [39,48]. The results indicate that the Crdoped ZnO catalyst was synthesized successfully.…”

Section: Resultsmentioning

confidence: 78%

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

Zelekew

Fufa

Sabir

et al. 2022

Journal of Nanomaterials

View full text Add to dashboard Cite

The Cr-doped ZnO photocatalysts were synthesized through the chromium ion accumulations by water hyacinth (Eichhornia crassipes). In the preparation process, the plant tissues were immersed in different sample flasks containing chromium precursors for 1, 2, 4, 6, and 8 days. The plant tissue containing chromium ion was mixed with zinc precursor followed by calcinations. For simplicity, the prepared Cr-doped ZnO samples with the plant immersed for 1, 2, 4, 6, and 8 days were abbreviated as D1, D2, D4, D6, and D8, respectively. Moreover, pure ZnO was also prepared without the water hyacinth plant accumulated with chromium ion for comparison purposes. The powder sample characterizations were performed and evaluated in the degradation of methylene blue (MB). The Cr-doped ZnO sample (D1) degrades 80% of MB dye while the D2, D4, D6, D8, and pure ZnO samples degrade only 74, 76, 79, 73, and 25%, respectively. On the other hand, without the addition of catalysts (blank), there was no significant degradation of MB dye within 90 min irradiation. Therefore, the degradation performance of Cr-doped ZnO in the presence of optimum amount of chromium dopant and water hyacinth is highly improved than that of pure ZnO. The catalytic improvement may be as a result of reducing the photogenerated electron and hole recombination rates due to the presence of dopants. Moreover, the presence of the Eichhornia crassipes plant in the synthesis of Cr-doped ZnO could also prevent further aggregations and particle size growth and enhance the porosity after calcination.

show abstract

Section: Resultsmentioning

confidence: 78%

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

Zelekew

Fufa

Sabir

et al. 2022

Journal of Nanomaterials

View full text Add to dashboard Cite

show abstract

“…The average crystallite sizes of pure MnO 2 and Ni-MnO 2 NPs at different doping level were determined by using the Scherrer Eq. ( 1) [57].…”

Section: Scherrer Techniquementioning

confidence: 99%

Influence of nickel doping on MnO2 nanoflowers as electrocatalyst for oxygen reduction reaction

2021

Self Cite

View full text Add to dashboard Cite

Doping is promising strategy for the alteration of nanomaterials to enhance their optical, electrical, and catalytic activities. The development of electrocatalysts for oxygen reduction reactions (ORR) with excellent activity, low cost and durability is essential for the large-scale utilization of energy storage devices such as batteries. In this study, MnO2 and Ni-doped MnO2 nanowires were prepared through a simple co-perception technique. The influence of nickel concentration on electrochemical performance was studied using linear sweep voltammetry and cyclic voltammetry. The morphological, thermal, structural, and optical properties of MnO2 and Ni-doped MnO2 nanowires were examined by SEM, ICP-OES, FT-IR, XRD, UV–Vis, BET and TGA/DTA. Morphological analyses showed that pure MnO2 and Ni-doped MnO2 had flower-like and nanowire structures, respectively. The XRD study confirmed the phase transformation from ε to α and β phases of MnO2 due to the dopant. It was also noted from the XRD studies that the crystallite sizes of pure MnO2 and Ni-doped MnO2 were in the range of 2.25–6.6 nm. The band gaps of MnO2 and 0.125 M Ni-doped MnO2 nanoparticles were estimated to be 2.78 and 1.74 eV, correspondingly, which can be seen from UV–Vis. FTIR spectroscopy was used to determine the presence of functional groups and M–O bonds (M = Mn, Ni). The TGA/TDA examination showed that Ni-doping in MnO2 led to an improvement in its thermal properties. The cyclic voltammetry results exhibited that Ni-doped MnO2 nanowires have remarkable catalytic performance for ORR in 0.1 M KOH alkaline conditions. This work contributes to the facile preparation of highly active and durable catalysts with improved catalytic performance mainly due to the predominance of nickel. Article Highlights MnO2 and Ni-doped MnO2 nanowires were synthesized via a facile co-perception approach. Nickel doping in MnO2 induces the formation of wire-like nanostructures. Nickel doping enhances the electrochemical activity and thermal stability of MnO2 nanoflowers. The addition of nickel into MnO2 promoted the catalytic activity for oxygen reduction reaction. A higher catalytic activity was achieved in 0.125 M Ni-MnO2 nanowires. Graphic abstract

show abstract

“…Zinc oxide (ZnO) semiconducting QDs have been one of the most important and largely investigated metal oxides for decades, 4 but still, they are considered a hot research topic globally owing to their exceptional optical properties, 5 excellent chemical and thermal stability, 6 cost-effectiveness, eco-friendly behavior, non-toxicity and biocompatibility 7 with a wide direct band gap of 3.37 eV, 8,9 large excitonic binding energy (60 meV) 10 and existence in a hexagonal zincite form. 10 So far, several solution-based techniques have been developed to synthesize ZnO QDs; 11 among them the colloidal method is the most widely used and popular as it is inexpensive, comparatively efficient, and relatively simple.…”

Section: Introductionmentioning

confidence: 99%

Exploring the photoexcited electron transfer dynamics in artificial sunscreen PBSA-coupled biocompatible ZnO quantum dots

et al. 2022

View full text Add to dashboard Cite

show abstract

Structural and thermal properties of pure and chromium doped zinc oxide nanoparticles

Cited by 40 publications

References 59 publications

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

Chromium Ion Accumulations from Aqueous Solution by the Eichorinia crassipes Plant and Reusing in the Synthesis of Cr‐Doped ZnO Photocatalyst

Influence of nickel doping on MnO2 nanoflowers as electrocatalyst for oxygen reduction reaction

Exploring the photoexcited electron transfer dynamics in artificial sunscreen PBSA-coupled biocompatible ZnO quantum dots

Contact Info

Product

Resources

About