A Novel ZnO/Co3O4 Nanoparticle for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

Tien, Tsung-Mo; Chen, Edward L.

doi:10.3390/catal13050852

Cited by 7 publications

(3 citation statements)

References 44 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figure 9 a, the survey XPS spectra of ZnO and ZnO-AC identified chemical elements Zn, O, and C, reflecting comparable chemical compositions for the samples. The high-resolution Zn 2p core level in Figure 9 b illustrates the distinct Zn 2p 3/2 and Zn 2p 1/2 peaks of ZnO exhibited at BEs of 1022.5 and 1045.6 eV, respectively, signifying the Zn 2+ oxidation state [ 31 ]. Notably, there were no differences in these peaks between ZnO and ZnO-AC.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Development of ZnO Nanostructure Doping with Water Hyacinth-Derived Activated Carbon for Visible-Light Photocatalysis

Krobthong,

Rungsawang,

Khaodara

et al. 2024

Toxics

View full text Add to dashboard Cite

Water hyacinth (Wh) is an aquatic weed considered a nuisance in agricultural and fishing activities. Therefore, this study proposed repurposing this plant into activated carbon (AC). First, the ZnO-AC was precipitated and applied as a photocatalyst for degrading methylene blue. The preliminary photocatalytic test under UV irradiation identified the optimum ZnO-AC photocatalyst to degrade methylene blue (MB). The ZnO-AC photocatalyst recorded the highest degradation rate constant of 11.49 × 10−3 min−1, which was almost two-fold higher than that of ZnO (5.55 × 10−3 min−1). Furthermore, photocatalytic degradation of MB and carbaryl under sunlight irradiation by ZnO-AC demonstrated degradation rate constants of 74.46 × 10−3 min−1 and 8.43 × 10−3 min−1, respectively. To investigate the properties of ZnO-AC, several techniques were performed. ZnO-AC and ZnO exhibited similar results in morphology, crystalline structure, and Raman characteristics. However, ZnO-AC presented smaller pore diameters than those of ZnO, which enlarged pore surface area, and the presence of carbon-related groups implied the presence of AC on ZnO-AC surfaces. This can be attributed to the presence of AC on the ZnO surface, increasing the capture of surrounding toxic molecules and elevating the reaction density. This mechanism is attributed to promoting the degradation of toxic molecules. Therefore, using Wh as a carbon source for the transformation of AC can alternatively solve the problems of aquatic weed management and carbon storage strategies, and the application of AC in ZnO-AC photocatalysts can enhance photocatalysis.

show abstract

Section: Resultsmentioning

confidence: 99%

Sustainable Development of ZnO Nanostructure Doping with Water Hyacinth-Derived Activated Carbon for Visible-Light Photocatalysis

Krobthong,

Rungsawang,

Khaodara

et al. 2024

Toxics

View full text Add to dashboard Cite

show abstract

“…Impressively, the Zn 3 V 2 O 8 /rGO photocatalyst exhibited a substantial hydrogen generation rate of 104.6 µmolg −1 . Furthermore, it demonstrated an excellent cyclic stability, indicating that it could be reused effectively as a photocatalyst [7,8].…”

Section: Synthesis Of Zn 3 V 2 O 8 /Rgo Nanocomposite For Photocataly...mentioning

confidence: 99%

Nanocomposites for Photocatalysis

Perez-Larios,

Varghese

2023

Inorganics

View full text Add to dashboard Cite

show abstract

“…Additionally, research, such as [ 24 ], has delved into variations in photoelectric properties in Co 3 O 4 /ZnO samples with different concentrations of the cobalt precursor. Another study, [ 25 ], focused on synthesizing ZnO/Co 3 O 4 nanoparticles with varying cobalt contents. Considering these factors, the investigation of the photocatalytic properties of ZnO/Co 3 O 4 structures for water decomposition emerges as a highly relevant and unexplored avenue in the existing body of literature.…”

Section: Introductionmentioning

confidence: 99%

Construction of a ZnO Heterogeneous Structure Using Co3O4 as a Co-Catalyst to Enhance Photoelectrochemical Performance

Markhabayeva,

Kalkozova,

Nemkayeva

et al. 2023

Materials

View full text Add to dashboard Cite

Recently, heterostructured photocatalysts have gained significant attention in the field of photocatalysis due to their superior properties compared to single photocatalysts. One of the key advantages of heterostructured photocatalysts is their ability to enhance charge separation and broaden the absorption spectrum, thereby improving photocatalytic efficiency. Zinc oxide is a widely used n-type semiconductor with a proper photoelectrochemical activity. In this study, zinc oxide nanorod arrays were synthesized, and then the surfaces of ZnO nanorods were modified with the p-type semiconductor Co3O4 to create a p–n junction heterostructure. A significant increase in the photocurrent for the ZnO/Co3O4 composite, of 4.3 times, was found compared to pure ZnO. The dependence of the photocurrent on the morphology of the ZnO/Co3O4 composite allows for optimization of the morphology of the ZnO nanorod array to achieve improved photoelectrochemical performance. The results showed that the ZnO/Co3O4 heterostructure exhibited a photocurrent density of 3.46 mA/cm2, while bare ZnO demonstrated a photocurrent density of 0.8 mA/cm2 at 1.23 V. The results of this study provide a better understanding of the mechanism of charge separation and transfer in the heterostructural ZnO/Co3O4 photocatalytic system. Furthermore, the results will be useful for the design and optimization of photocatalytic systems for water splitting and other applications.

show abstract

A Novel ZnO/Co3O4 Nanoparticle for Enhanced Photocatalytic Hydrogen Evolution under Visible Light Irradiation

Cited by 7 publications

References 44 publications

Sustainable Development of ZnO Nanostructure Doping with Water Hyacinth-Derived Activated Carbon for Visible-Light Photocatalysis

Sustainable Development of ZnO Nanostructure Doping with Water Hyacinth-Derived Activated Carbon for Visible-Light Photocatalysis

Nanocomposites for Photocatalysis

Construction of a ZnO Heterogeneous Structure Using Co3O4 as a Co-Catalyst to Enhance Photoelectrochemical Performance

Contact Info

Product

Resources

About