Hydrogen production via water splitting using different Au@ZnO catalysts under UV–vis irradiation

Machín, Abniel; Cotto, María; Duconge, José; Arango, Juan C.; Morant, Carmen; Pinilla, Sergio; Soto-Vázquez, Loraine; Resto, Edgard; Márquez, Francisco

doi:10.1016/j.jphotochem.2017.11.050

Cited by 65 publications

(61 citation statements)

References 44 publications

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“…The characterization of the different ZnO supports and Au@ZnO-based catalysts was shown in our previous research [ 18 ]. On these catalysts, 1 wt.% graphene was incorporated.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the reaction mixture was irradiated with UV–vis light for 2 h using different filters to select the appropriate wavelength (280 nm, 320 nm, 400 nm, and 500 nm). The produced hydrogen was quantified by gas chromatography (GC), using a thermal conductivity detector (GC–TCD, Perkin-Elmer Clarus 600) [ 18 ].…”

Section: Methodsmentioning

confidence: 99%

“…Similar to titanium oxide, ZnO has also been demonstrated to be chemically stable, easy to produce, non-toxic, abundant, and environmentally-friendly [ 9 , 10 ], although unlike titanium dioxide, ZnO has been widely used for the degradation of organic pollutants and energy storage [ 14 , 15 , 16 ]. Some authors [ 17 , 18 ] consider that ZnO shows some disadvantages for the production of hydrogen by water splitting, especially the recombination of photogenerated electron–hole pairs, fast backward reaction, and the inability to use visible light. To try to solve these limitations, different approaches have been implemented over the years.…”

Section: Introductionmentioning

confidence: 99%

“…To try to solve these limitations, different approaches have been implemented over the years. One of them has been the incorporation of noble metal to the surface of the catalysts [ 17 , 18 ]. Among noble metals, gold has gained much attention since the 1980s because of its wide range of applications, including electronics, photodynamic therapy, delivery of therapeutic agents, sensors, probes, diagnostics, and catalysis [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

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Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Machín¹,

Arango

Fontánez

et al. 2020

Biomimetics

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For some decades, the scientific community has been looking for alternatives to the use of fossil fuels that allow for the planet’s sustainable and environmentally-friendly development. To do this, attempts have been made to mimic some processes that occur in nature, among which the photosystem-II stands out, which allows water splitting operating with different steps to generate oxygen and hydrogen. This research presents promising results using synthetic catalysts, which try to simulate some natural processes, and which are based on Au@ZnO–graphene compounds. These catalysts were prepared by incorporating different amounts of gold nanoparticles (1 wt.%, 3 wt.%, 5 wt.%, 10 wt.%) and graphene (1 wt.%) on the surface of synthesized zinc oxide nanowires (ZnO NWs), and zinc oxide nanoparticles (ZnO NPs), along with a commercial form (commercial ZnO) for comparison purposes. The highest amount of hydrogen (1127 μmol/hg) was reported by ZnO NWs with a gold and graphene loadings of 10 wt.% and 1 wt.%, respectively, under irradiation at 400 nm. Quantities of 759 μmol/hg and 709 μmol/hg were obtained with catalysts based on ZnO NPs and commercial ZnO, respectively. The photocatalytic activity of all composites increased with respect to the bare semiconductors, being 2.5 times higher in ZnO NWs, 8.8 times higher for ZnO NPs, and 7.5 times higher for commercial ZnO. The high photocatalytic activity of the catalysts is attributed, mainly, to the synergism between the different amount of gold and graphene incorporated, and the surface area of the composites.

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“…The characterization of the different ZnO supports and Au@ZnO-based catalysts was shown in our previous research [ 18 ]. On these catalysts, 1 wt.% graphene was incorporated.…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Machín¹,

Arango

Fontánez

et al. 2020

Biomimetics

Self Cite

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“…It has already been reported that the electron lifetime can be significantly higher and that the rate of recombination can be lower in ZnO in comparison to TiO2, making it an attractive material worth to investigate for photocatalytic applications [12]. Further, the photocatalytic activity of ZnO can be enhanced by designing ZnO supported metal nanoparticle photocatalysts, with promising results mainly in the case [13] of Au and Ag [14][15][16][17][18][19]. In such hybrid metal/ZnO nanostructure, the supported nanoparticles are proposed i) to act as a sink for photoinduced electrons, so that the metal/semi-conductor interface could promote effective charge separation with efficient interfacial charge transfer, or ii) to induce plasmonic effects either through the direct injection of hot (excited) electrons from the metal to the conduction band of ZnO thanks to intimate electrochemical contact between the plasmonic particle and the semiconductor, or through an near-field enhancement mechanism with overlap between the plasmon wavelength and the photocatalyst absorption.…”

Section: Introductionmentioning

confidence: 99%

Photoactive ZnO Materials for Solar Light Induced Cu<sub>x</sub>O-ZnO Catalyst Preparation

Brzezińska¹,

García‐Muñoz²,

Ruppert³

et al. 2018

Preprint

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In this work, the solar light-induced redox photoactivity of the ZnO semiconductor material was used to prepare at room temperature CuxO-ZnO composite catalysts with a control of the chemical state of the copper oxide phase. The preparation of Cu2(I)O-ZnO and Cu(II)O-ZnO composite catalysts was achieved by using Cu(acac)2 in THF-water and Cu(NO3)2 in water as metallic precursor, respectively. Prior to the implementation of the photo-assisted synthesis method, the most efficient photoactive ZnO material was selected among different ZnO materials prepared by the low temperature polyol method and through the precipitation method with carbonates and carbamates as precipitation agent, by taking the photocatalytic degradation of the 4-chlorophenol compound in water under simulated solar light as model reaction. The ZnO support materials were characterized by XRD, BET, TGA, SEM and TEM, and the synthesis method was strongly influencing their photoactivity in terms of 4-chlorophenol degradation and of total organic carbon removal. The most photoactive ZnO material was prepared by precipitation with carbonates and calcined at 300°C, and was taking advantage of a high specific surface area and a small mean crystallite size for achieving a complete 4-chlorophenol mineralization within 70 min of reaction, with a minimum Zn2+ released to the solution due to surface photocorrosion. Beside thermal catalysis applications, this work opened a new route for the facile synthesis of Cu2O-ZnO heterojunction photocatalysts, that could take advantage under solar light of the heterojunction built between the p-type semi-conductor Cu2O with direct visible light band gap and the ZnO semiconductor phase.

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Oxide based Heterostructured Photocatalysts for CO₂ Reduction and Hydrogen Generation

2023

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Global warming and its cause and effects have necessitated the researchers to look beyond fossil and its derivatives. The scalability of CO2 reduction and H2 energy is one of the most enigmatic questions asked by the calamitous environmental changes happening across the world such as bushfires in Australia, Amazon and California or the melting of Arctic and Antarctic ice scalps. Thus, the research fraternity is keen to elevate the efficiency of CO2 reduction and H2 energy to the extent that the good chemical livestock produced by CO2 conversion and H2 fuel would become principal energy resources. In this quest, photocatalytic pathway envisions the environmentally benign protocol to bring about CO2 reduction and H2 production. Photo‐reduction of CO2 and H2 generation via photocatalytic water splitting by utilizing oxide based heterostructured photocatalysts are the promising approaches to carry out CO2 mitigation and H2 production efficiently ascribed to the advanced optoelectronic and structural superiority of oxides photocatalysts as discussed in this review.

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Hydrogen production via water splitting using different Au@ZnO catalysts under UV–vis irradiation

Cited by 65 publications

References 44 publications

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Photoactive ZnO Materials for Solar Light Induced Cu<sub>x</sub>O-ZnO Catalyst Preparation

Oxide based Heterostructured Photocatalysts for CO₂ Reduction and Hydrogen Generation

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Hydrogen production via water splitting using different Au@ZnO catalysts under UV–vis irradiation

Cited by 65 publications

References 44 publications

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Biomimetic Catalysts Based on Au@ZnO–Graphene Composites for the Generation of Hydrogen by Water Splitting

Photoactive ZnO Materials for Solar Light Induced Cu<sub>x</sub>O-ZnO Catalyst Preparation

Oxide based Heterostructured Photocatalysts for CO2 Reduction and Hydrogen Generation

Contact Info

Product

Resources

About

Oxide based Heterostructured Photocatalysts for CO₂ Reduction and Hydrogen Generation