Superior photoelectrochemical activity of self-assembled NiWO4–WO3 heteroepitaxy

Hien, Thi; Van, Chien Nguyen; Tsai, Kai An; Quynh, Le Thi; Chen, Jhih Wei; Lin, Yan; Chen, Yi Chun; Chou, Wu Ching; Wu, Chang-Luen; Hsu, Yung‐Jung; Chu, Ying Hao

doi:10.1016/j.nanoen.2016.03.021

Cited by 40 publications

(15 citation statements)

References 30 publications

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“…Chu and co‐workers have investigated photocatalysts in BFO:ε‐Fe 2 O 3 VANs by investigating the band structure, ultrafast time‐resolved spectroscopy and electrochemical impedance spectroscopy . It was found the VAN structure assists photoexcited carrier separation and suppresses electron–hole recombination, giving rise to enhanced photo‐electrochemical performance in this VAN system as well as in the NiWO 4 :WO 3 VAN system . In another approach, Sangle et al developed substrate‐supported mesoporous structures which are achieved by first growing STO:MgO VANs, followed by selective etching of MgO nanopillars .…”

Section: Functionality Tuning Driven By Strain Defect and Interfacementioning

confidence: 99%

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

et al. 2018

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Complex metal oxides, which show a variety of functional properties such as ferromagnetism, ferroelectricity, multi-ferroelectricity, superconductivity, and ionic conduction, have attracted much attention in the past decades. These exotic physical properties arise from a complex hierarchy of competing interactions among spin, charge, orbital, and lattice degrees of freedom. The development of advanced characterization techniques such as electron microscopy, neutron scattering, synchrotron scattering and imaging, spectroscopy at high magnetic fields, and others has enabled us to study the interactions among these degrees of freedom coupled with strain, defect, and interface Vertically aligned nanocomposite thin films with ordered two phases, grown epitaxially on substrates, have attracted tremendous interest in the past decade. These unique nanostructured composite thin films with large vertical interfacial area, controllable vertical lattice strain, and defects provide an intriguing playground, allowing for the manipulation of a variety of functional properties of the materials via the interplay among strain, defect, and interface. This field has evolved from basic growth and characterization to functionality tuning as well as potential applications in energy conversion and information technology. Here, the remarkable progress achieved in vertically aligned nanocomposite thin films from a perspective of tuning functionalities through control of strain, defect, and interface is summarized. Thin FilmsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201803241. 12 11 12where c 11 and c 12 are elastic moduli of the film material. Epitaxial strain gradually changes with film thickness in perovskite manganites. Figure 3 shows reciprocal space mapping or RSM (103) of La 0.7 Ca 0.3 MnO 3 (LCMO) films on STO (001) substrates. It captures the gradual strain relaxation process with increasing film thickness in manganite thin films. When the film is very thin, the interface is coherent with

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Section: Functionality Tuning Driven By Strain Defect and Interfacementioning

confidence: 99%

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

et al. 2018

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“…In addition, a α-SnWO 4 /SnO 2 heterostructure was synthesized with CTAB as the surfactant [ 170 ] and displayed enhanced photocatalytic performance compared to that of pure α-SnWO 4 . Considering that WO 3 can be obtained by dehydration from tungstate acid, WO 3 is considered to be simultaneously produced during the synthesis of MWO 4 and is likely to form a MWO 4 /WO 3 heterojunction, such as CoWO 4 /WO 3 [ 171 , 172 ], NiWO 4 /WO 3 [ 173 , 174 ], or CuWO 4 /WO 3 [ 175 , 176 ]. Aslam et al [ 177 ] prepared a CdWO 4 /WO 3 heterojunction using a hydrothermal and chemisorption method, and reported enhanced photocatalytic activities toward the degradation of organic pollutants, compared with pure CdWO 4 and WO 3 .…”

Section: Strategies For Enhanced Photocatalytic Activitymentioning

confidence: 99%

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

et al. 2018

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Visible-light-responsive ternary metal tungstate (MWO4) photocatalysts are being increasingly investigated for energy conversion and environmental purification applications owing to their striking features, including low cost, eco-friendliness, and high stability under acidic and oxidative conditions. However, rapid recombination of photoinduced electron–hole pairs and a narrow light response range to the solar spectrum lead to low photocatalytic activity of MWO4-based materials, thus significantly hampering their wide usage in practice. To enable their widespread practical usage, significant efforts have been devoted, by developing new concepts and innovative strategies. In this review, we aim to provide an integrated overview of the fundamentals and recent progress of MWO4-based photocatalysts. Furthermore, different strategies, including morphological control, surface modification, heteroatom doping, and heterojunction fabrication, which are employed to promote the photocatalytic activities of MWO4-based materials, are systematically summarized and discussed. Finally, existing challenges and a future perspective are also provided to shed light on the development of highly efficient MWO4-based photocatalysts.

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“…9(d)-9(f)] with excellent performance on the photoelectrochemical (PEC) water splitting. [56] The use of self-assembled NiWO 4 -WO 3 heteroepitaxy enables one to obtain the intrinsic PEC properties of the mesocrystal system by eliminating the interference factors such as structural defects, orientations, and impurity phases. The energy band diagram of NiWO 4 -WO 3 heterostructure probed by x-ray photoelectron spectroscopy suggested an efficient charge separation at their interface by injecting photo-generated electrons from NiWO 4 to WO 3 and holes from WO 3 to NiWO 4 , resulting in an enhanced PEC performance.…”

Section: New Possibilities Within Mesocrystal-embedded Oxide Systemsmentioning

confidence: 99%

Mesocrystal-embedded functional oxide systems

2016

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Mesocrystal-a new class of crystals compared with conventional single crystals and randomly distributed nanocrystal systems-has captured significant attention in recent decades. Current studies have been focused on the advanced synthesis as well as the intriguing properties of mesocrystal. In order to create new opportunities upon functional mesocrystals, they can be regarded as a new functional entirety when integrated with unique matrix environments. The elegant combination of mesocrystals and matrices has enabled researchers to realize enthralling tunabilities and to derive new functionalities that cannot be found in individual components. Therefore, mesocrystal-embedded system forms a new playground towards multifunctionalities. This review article delivers a general roadmap that portrays the enhancement of intrinsic properties and new functionalities driven by novel mesocrystal-embedded oxide systems. An in-depth understanding and breakthroughs achieved in mesocrystal-embedded oxide systems are highlighted. This article concludes with a brief discussion on potential directions and perspectives along this research field.

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Superior photoelectrochemical activity of self-assembled NiWO4–WO3 heteroepitaxy

Cited by 40 publications

References 30 publications

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

Mesocrystal-embedded functional oxide systems

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