Adjusting the proportions of {0001} facets and high-index facets of ZnO hexagonal prisms and their photocatalytic activity

Liu, Yu; Liu, Haixia; Zhang, Qing; Li, Tianduo

doi:10.1039/c6ra24912d

Cited by 29 publications

(10 citation statements)

References 32 publications

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“…In addition, it has been widely reported that the high‐index facets promote the photocatalytic performance of semiconductors owing to the high density of atomic steps, ledges, and kinks, which usually serve as active sites for surface catalytic reactions . However, the high‐index facets usually disappear during crystal growth to minimize the total surface energy, which makes it difficult to fabricate photocatalyst with exposed high‐index facets . Thus, it is interesting to design and synthesize high‐index‐faceted photocatalysts to promote the efficiency of POWS.…”

Section: Introductionmentioning

confidence: 99%

X‐Shaped α‐FeOOH with Enhanced Charge Separation for Visible‐Light‐Driven Photocatalytic Overall Water Splitting

et al. 2018

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Photocatalytic overall water splitting (POWS) is a promising route for converting solar energy into green and sustainable energy. Herein, we report a facile hydrothermal approach for the fabrication of x-shaped α-FeOOH photocatalysts containing high-index facets for POWS. The x-shaped α-FeOOH photocatalysts exhibited enhanced visible-light-driven POWS activities in comparison with that of FeOOH without x-structures, with a maximum H and O evolution rate of 9.2 and 4.7 μmol h g , respectively. The morphology and particle size of the α-FeOOH could be controlled by adjusting the NH F concentration in the precursors. The photodeposition of Pt and RuO on the x-shaped α-FeOOH revealed the specially separated reduction and oxidation centers on the surface of α-FeOOH, with the oxidation-active sites selectively located on the edges of the α-FeOOH x-structures. Electrochemical experiments further affirmed the enhanced charge separation in the x-shaped α-FeOOH. The smaller particle size and unique x-shape of the α-FeOOH photocatalyst were shown to enhance the POWS performance owing to the large specific surface area, high proportion of exposed high-index facets, high electron-transfer efficiency and effective separation of the photogenerated electron-hole pairs. The current study revealed that the x-shaped α-FeOOH products could serve as cost-effective and stable photocatalysts for POWS.

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Section: Introductionmentioning

confidence: 99%

X‐Shaped α‐FeOOH with Enhanced Charge Separation for Visible‐Light‐Driven Photocatalytic Overall Water Splitting

et al. 2018

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“…However, most of them aimed at an investigation of the effects of morphology and crystal size on the sensing behavior but not on the exploration of their crystal plane-dependent properties. Indeed, theoretical and experimental results indicate that nanostructured materials with exposed crystal surfaces can exhibit special features in applications such as catalysts [25,26] and gas sensors [19,[27][28][29][30]. Han et al [31] showed that SnO 2 octahedral nanoparticles with exposed high energy {221} facets, exhibited better gas-sensing performance towards ethanol than those with mainly exposed {110} facets.…”

Section: Zno Exposed Crystal Planes and Sensing Behaviormentioning

confidence: 99%

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Leonardi

2017

Chemosensors

147

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Two-dimensional (2D) nanomaterials, due to their unique physical and chemical properties, are showing great potential in catalysis and electronic/optoelectronic devices. Moreover, thanks to the high surface to volume ratio, 2D materials provide a large specific surface area for the adsorption of molecules, making them efficient in chemical sensing applications. ZnO, owing to its many advantages such as high sensitivity, stability, and low cost, has been one of the most investigated materials for gas sensing. Many ZnO nanostructures have been used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases. This review summarizes most of the research articles focused on the investigation of 2D ZnO structures including nanosheets, nanowalls, nanoflakes, nanoplates, nanodisks, and hierarchically assembled nanostructures as a sensitive material for conductometric gas sensors. The synthesis of the materials and the sensing performances such as sensitivity, selectivity, response, and recovery times as well as the main influencing factors are summarized for each work. Moreover, the effect of mainly exposed crystal facets of the nanostructures on sensitivity towards different gases is also discussed.

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“…Thus, due to the high surface energy of {0001} facets, the exposure of {0001} facets may enhance the efficiency of photocatalysis. However, it has been shown that nanostructures with high percentages of exposed high-index facets also exhibited superior photocatalytic activity [200].…”

Section: Zno Photocatalytic Papermentioning

confidence: 99%

Metal Oxide-Based Photocatalytic Paper: A Green Alternative for Environmental Remediation

et al. 2021

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The interest in advanced photocatalytic technologies with metal oxide-based nanomaterials has been growing exponentially over the years due to their green and sustainable characteristics. Photocatalysis has been employed in several applications ranging from the degradation of pollutants to water splitting, CO2 and N2 reductions, and microorganism inactivation. However, to maintain its eco-friendly aspect, new solutions must be identified to ensure sustainability. One alternative is creating an enhanced photocatalytic paper by introducing cellulose-based materials to the process. Paper can participate as a substrate for the metal oxides, but it can also form composites or membranes, and it adds a valuable contribution as it is environmentally friendly, low-cost, flexible, recyclable, lightweight, and earth abundant. In term of photocatalysts, the use of metal oxides is widely spread, mostly since these materials display enhanced photocatalytic activities, allied to their chemical stability, non-toxicity, and earth abundance, despite being inexpensive and compatible with low-cost wet-chemical synthesis routes. This manuscript extensively reviews the recent developments of using photocatalytic papers with nanostructured metal oxides for environmental remediation. It focuses on titanium dioxide (TiO2) and zinc oxide (ZnO) in the form of nanostructures or thin films. It discusses the main characteristics of metal oxides and correlates them to their photocatalytic activity. The role of cellulose-based materials on the systems’ photocatalytic performance is extensively discussed, and the future perspective for photocatalytic papers is highlighted.

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Adjusting the proportions of {0001} facets and high-index facets of ZnO hexagonal prisms and their photocatalytic activity

Cited by 29 publications

References 32 publications

X‐Shaped α‐FeOOH with Enhanced Charge Separation for Visible‐Light‐Driven Photocatalytic Overall Water Splitting

X‐Shaped α‐FeOOH with Enhanced Charge Separation for Visible‐Light‐Driven Photocatalytic Overall Water Splitting

Two-Dimensional Zinc Oxide Nanostructures for Gas Sensor Applications

Metal Oxide-Based Photocatalytic Paper: A Green Alternative for Environmental Remediation

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