Hierarchical flowerlike WO3 nanostructures assembled by porous nanoflakes for enhanced NO gas sensing

Cai, Ze-Xing; Li, Huayao; Ding, Jiaqi; Guo, Xin

doi:10.1016/j.snb.2017.02.075

Cited by 64 publications

(26 citation statements)

References 49 publications

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“…Evidently, the SnO2/NiO thin film in this work exhibits a remarkable response to 10 ppm methanol, combined with a lower operating temperature and faster recovery time than the others. Similarly to other semiconductors, the gas-sensing mechanism of the SnO 2 -NiO composite thin film to methanol shown in Figure 5a relies on the adsorption and desorption of oxygen, which leads to a change in the resistance [33][34][35]. Furthermore, the good selectivity and fast recovery rate are attributed to the unique properties of p-type semiconductors such as NiO [36].…”

Section: Resultsmentioning

confidence: 97%

A Simple Dip-Coating Method of SnO2-NiO Composite Thin Film on a Ceramic Tube Substrate for Methanol Sensing

Wang

et al. 2019

Crystals

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In this work, SnO2-NiO composite thin film was successfully grown on a ceramic tube substrate directly by a simple dip-coating method combined with annealing. Characterization analysis demonstrates that uniform SnO2 film consists of a great number of nanospheres and NiO grows on SnO2 as an agglomerated block. In comparison to the pure SnO2 sample, the SnO2-NiO composite thin films gas sensor exhibits superior methanol sensing properties at 225 °C. The gas response to 10 ppm methanol reached 15.12 and the response and recovery times were 8 s and 7 s, respectively. The excellent selectivity and recovery rate are explained by the unique properties of the NiO semiconductor and the higher sensor response is attributed to the pivotal heterojunction effect.

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Section: Resultsmentioning

confidence: 97%

A Simple Dip-Coating Method of SnO2-NiO Composite Thin Film on a Ceramic Tube Substrate for Methanol Sensing

Wang

et al. 2019

Crystals

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“…Tungsten oxides are an important class of transition‐metal oxides that offer good specific capacity and high electrical conductivity values compared with those of other conventional electrode materials. In addition, their unique physicochemical properties make them effective electrode materials for various applications, as depicted in Scheme . Although tungsten oxides have good charge‐storage properties because of their multiple transition states, recent studies have proposed that tungsten oxide based materials frequently have a poor rate capability, a large irreversible capacity, energy inadequacy, a low coulombic efficiency, and a low cycling stability.…”

Section: Overview Of Wo3 Compoundsmentioning

confidence: 99%

“…In addition, their uniquep hysicochemical properties make them effective electrode materials for variousa pplications,a sd epicted in Scheme2. [63][64][65][66][67] Although tungsten oxidesh ave good chargestoragep roperties because of their multiple transition states, recents tudies have proposed that tungsten oxide based materials frequently have ap oor rate capability,alarge irreversible capacity, energy inadequacy,alow coulombic efficiency,a nd a low cyclings tability.T hese impediments are supposed to be embedded in their charge-storage mechanisms. However,i ti s difficult to say that these are simply relatedtot heir microstructures without acomplete understanding of their causes and effects.…”

Section: Importance Of Wo 3 -Based Materials In Electrochemical Energmentioning

confidence: 99%

Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Shinde

2019

ChemSusChem

147

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Current progress in the advancement of energy‐storage devices is the most important factor that will allow the scientific community to develop resources to meet the global energy demands of the 21st century. Nanostructured materials can be used as effective electrodes for energy‐storage devices because they offer various promising features, including high surface‐to‐volume ratios, exceptional charge‐transport features, and good physicochemical properties. Until now, the successful research frontrunners have focused on the preparation of positive electrode materials for energy‐storage applications; nevertheless, the electrochemical performance of negative electrodes is less frequently reported. This review mainly focuses on the current progress in the development of tungsten oxide‐based electrodes for energy‐storage applications, primarily supercapacitors (SCs) and batteries. Tungsten is found in various stoichiometric and nonstoichiometric oxides. Among the different tungsten oxide materials, tungsten trioxide (WO3) has been intensively investigated as an electrode material for different applications because of its excellent charge‐transport features, unique physicochemical properties, and good resistance to corrosion. Various WO3 composites, such as WO3/carbon, WO3/polymers, WO3/metal oxides, and tungsten‐based binary metal oxides, have been used for application in SCs and batteries. However, pristine WO3 suffers from a relatively low specific surface area and low energy density. Therefore, it is crucial to thoroughly summarize recent progress in utilizing WO3‐based materials from various perspectives to enhance their performance. Herein, the potential‐ and pH‐dependent behavior of tungsten in aqueous media is discussed. Recent progress in the advancement of nanostructured WO3 and tungsten oxide‐based composites, along with related charge‐storage mechanisms and their electrochemical performances in SCs and batteries, is systematically summarized. Finally, remarks are made on future research challenges and the prospect of using tungsten oxide‐based materials to further upgrade energy‐storage devices.

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“…NO gas-sensing mechanism NO gas-sensing mechanism can be understood based on the resistance change resulted from the adsorption of NO gas molecules onto nanospiral and dense ZnO thin lm, and the reaction between them. 34 The possible reactions on the surface of the ZnO thin lms can be described as following: [35][36][37][38]…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Nitric oxide sensors using nanospiral ZnO thin film deposited by GLAD for application to exhaled human breath

et al. 2020

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Hierarchical flowerlike WO3 nanostructures assembled by porous nanoflakes for enhanced NO gas sensing

Cited by 64 publications

References 49 publications

A Simple Dip-Coating Method of SnO2-NiO Composite Thin Film on a Ceramic Tube Substrate for Methanol Sensing

A Simple Dip-Coating Method of SnO2-NiO Composite Thin Film on a Ceramic Tube Substrate for Methanol Sensing

Review on Recent Progress in the Development of Tungsten Oxide Based Electrodes for Electrochemical Energy Storage

Nitric oxide sensors using nanospiral ZnO thin film deposited by GLAD for application to exhaled human breath

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