Fast hydrogen diffusion induced by hydrogen pre-split for gasochromic based optical hydrogen sensors

Wang, Haoran; Wu, Guangming; Zhao, Huiyue; Qi, Wanyu; Chen, Kaicong; Zhang, Wan; Li, Yunyun

doi:10.1016/j.ijhydene.2019.04.026

Cited by 20 publications

(15 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To analyze the structure of SiO 2 , liquid-state 29 Si NMR for the sols was performed, and the results are shown in Figure 4a.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Materials Characterization. The film and sol were characterized using scanning electron microscopy (SEM, FEI Quanta 650FEG), transmission electron microscopy (TEM, FEI Tecnai G2 F20 and JEOL JEM-2100F) with energy-dispersive X-ray spectroscopy, dynamic light scattering particle size analysis (viscosity, HORIBA LB-550), Fourier transform infrared spectroscopy (FTIR, Bruker Tensor 27), liquid-state 29 Si nuclear magnetic resonance (NMR, Bruker AVANCE III HD 500 MHz), and UV−vis−NIR spectrophotometry (JASCO V-570).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The 29 Si spectra were referenced to the 29 Si frequency of tetramethylsilane, defined as 0 ppm. The solvent used was ethanold 6 (99%, OKA).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…For the gasochromic performance test, a catalyst layer was dip coated onto the WO 3 film. The catalyst precursor was prepared according to the SiO 2 −PdCl 2 sol manufacturing technique reported by Haoran Wang et al 29 The process used is described as follows: TEOS (AR 28.4%, SCRC) was mixed with half its volume of EtOH to form solution A, and the same amount of EtOH was mixed with H 2 O and hydrochloric acid (HCl, AR 36.0− 38.0%, SCRC) to form solution B. Solution B was added dropwise to solution A to prepare a SiO 2 sol.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

See 3 more Smart Citations

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

Xue

Wang

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

Although smart energy-saving windows, such as electrochromic, thermochromic, and gasochromic windows, show promising applications, they are still being delayed due to the lack of suitable methods for large-area manufacturing. To meet the demands of low cost and fast fabrication, printing methods have been widely studied for electrochromic film deposition. However, hydrogen diffusion depends on the porosity of gasochromic films, which renders the use of usual printing inks impracticable. In this study, a novel kind of WO3/SiO2 ink with suitable rheological characteristics for gasochromic windows was developed by prehydrolyzing and condensing SiO2 in a neutral solution. The kinetics were explored using nuclear magnetic resonance and density functional theory, indicating that the SiO2 growth directions can be controlled at various pH values. The prehydrolysis of SiO2 in a neutral solution exhibits adequate mechanical robustness, suitable rheological characteristics, and stable thermodynamics. Based on the prehydrolysis of SiO2 sol, porous SiO2 skeletons supporting WO3 gasochromic films were synthesized by using automated printing methods, which exhibit a high transmittance of 90%, a high solar energy shielding property of 84%, and good annealing stability at 150 °C. In actual energy-saving tests, the as-prepared gasochromic windows show a much slower rate of increase in room temperature compared to normal windows.

show abstract

“…To analyze the structure of SiO 2 , liquid-state 29 Si NMR for the sols was performed, and the results are shown in Figure 4a.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The 29 Si spectra were referenced to the 29 Si frequency of tetramethylsilane, defined as 0 ppm. The solvent used was ethanold 6 (99%, OKA).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

See 2 more Smart Citations

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

Xue

Wang

Zhang

et al. 2021

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…have been developed for decades. [4][5][6][7][8] Colorimetric hydrogen sensors have attracted great attention for their advantages of rapid and accurate detection of hydrogen gas by changing color without electrical devices, which is a possible component igniting hydrogen gas during the sensing of hydrogen. [9][10][11][12] According to related research reports to date, it is well known that the colorimetric hydrogen-sensing materials with high sensitivity are composed of palladium oxide (PdO)/metal oxide hybrids, Pt/metal oxide hybrids, or Pd-based alloys such as PdO/zinc oxide (ZnO), PdO/TiO 2 , PdO/MgO, Pd/WO 3 -SiO 2 , Pd/ MoO 3 , and Pd/MgNb 2 O 5 and Pt/WO 3 -SiO 2 .…”

mentioning

confidence: 99%

Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H₂ leakage

Hwang

Kim

Jeong

et al. 2020

Textile Research Journal

View full text Add to dashboard Cite

A colorimetric hydrogen sensor has great potential for accurately detecting and monitoring the leakage of hydrogen gas on account of its fast color change in contact with hydrogen gas. However, for the practical application of the sensor, such as in gas detection systems in clothing, the flexibility and stability of the sensor need to be improved. Here, we present a novel method to fabricate a flexible colorimetric hydrogen sensor with the stable embedment of sensing material. To improve the flexibility and stability of the sensor, polyacrylonitrile nanofiber containing palladium oxide and zinc oxide hybrid nanoparticles was prepared by electrospinning. The flexible colorimetric hydrogen sensor can detect 1000 ppm hydrogen gas with excellent selectivity within 2 min. We also suggest film and yarn-type flexible colorimetric hydrogen sensors for industrial and wearable applications. A laminating process was used to prepare the film. In contrast, twisting and polydimethylsiloxane coating were used to prepare the yarn-type flexible colorimetric hydrogen sensor. Compared with a flexible colorimetric hydrogen-sensing nanofiber, the film and yarn show identical sensitivity for detecting a hydrogen leakage. These applications of hydrogen sensors could be a new insight into the design of a flexible sensor for detecting hydrogen leakage with the naked eye.

show abstract

Structure Design and Performance Research of WO₃ Hydrogen Gasochromic Film Prepared by Solvothermal Synthesis Assisted with Electrodeposition of Seed Layer

Gao

Guo

Nie

et al. 2022

Adv Materials Inter

View full text Add to dashboard Cite

air is a kind of hydrogen-sensitive material and can change its color when exposed to hydrogen. This hydrogen gasochromic phenomenon provides a visualized and safer method without electrical signals to detect hydrogen.As a versatile material, WO 3 film can be directly used for photocatalysis and electrochromism without catalyst. Researchers have done a lot of work in these fields. [1,2] However, catalyst loading is essential to observe hydrogen gasochromism of WO 3 film at room temperature. Currently, although many issues regarding the mechanism of WO 3 hydrogen gasochromism have not been fully understood, the processes of adsorption and decomposition of H 2 or O 2 on the surface of the catalyst and the diffusion of H or O atoms between catalyst and WO 3 are widely recognized in different models. The commonly used catalyst materials are Pt and Pd. [3,4] Meanwhile, some researchers also use PdO, PtO x or Pd-Pt alloy as catalysts. [5,6] Usually, there are two ways to load catalyst. One is to prepare WO 3 film first, then load the catalyst on it. [4,6,7] The other is to merge the preparation of WO 3 film and the loading of catalyst into one step. [8,9] Many methods have been used to prepare WO 3 films, such as PVD, [10][11][12] CVD, [13,14] sol-gel method, [15,16] hydrothermal/ solvothermal method, [17][18][19][20] electrodeposition and anodic oxidation. [21][22][23][24] The hydrothermal/solvothermal method can be used to prepare nanostructured film with simple experimental conditions and low cost. Compared with dense film, nanostructured porous film with the high specific surface area often has better catalysis and reaction performance, so the hydrothermal/ solvothermal method is a promising method to prepare nanostructured porous WO 3 film. Before hydrothermal/solvothermal synthesis, many researchers prepare seed layer on the substrate firstly for the consideration of the provision of nucleation sites and good adhesion between substrate and film. A typical process of preparing seed layer includes synthesis of WO 3 sol, spin coating, and annealing. To guarantee the quality of the seed layer, this process has to be repeated several times. As a result, the time-consuming and laborious heat treatment is indispensable for preparing seed layer in the solvothermal synthesis of The time-consuming and laborious heat treatment is indispensable for preparing seed layer in solvothermal synthesis of WO 3 film. Herein, WO 3 film is prepared composed of single crystal WO 3 nanowires on indium tin oxide (ITO) glass assisted with simple and energy-saving electrodeposited seed layer for the first time. The catalyst Pt is sputtered on it for 30 s after WO 3 film is synthesized to form the hydrogen gasochromic film. The film structure is redesigned to improve its hydrogen gasochromic properties further. Before WO 3 film is solvothermally synthesized, Pt is sputtered on seed layer for 15 s, then it is sputtered for 15 s again after WO 3 film is prepared. The Pt sputtered on seed layer greatly changes the morphology of nanowires, makin...

show abstract

Fast hydrogen diffusion induced by hydrogen pre-split for gasochromic based optical hydrogen sensors

Cited by 20 publications

References 42 publications

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H₂ leakage

Structure Design and Performance Research of WO₃ Hydrogen Gasochromic Film Prepared by Solvothermal Synthesis Assisted with Electrodeposition of Seed Layer

Contact Info

Product

Resources

About

Fast hydrogen diffusion induced by hydrogen pre-split for gasochromic based optical hydrogen sensors

Cited by 20 publications

References 42 publications

Highly Thermally Stable and Transparent WO3–SiO2 Gasochromic Films Obtained by an Automated Printing Method

Highly Thermally Stable and Transparent WO3–SiO2 Gasochromic Films Obtained by an Automated Printing Method

Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H2 leakage

Structure Design and Performance Research of WO3 Hydrogen Gasochromic Film Prepared by Solvothermal Synthesis Assisted with Electrodeposition of Seed Layer

Contact Info

Product

Resources

About

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

Highly Thermally Stable and Transparent WO₃–SiO₂ Gasochromic Films Obtained by an Automated Printing Method

Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H₂ leakage

Structure Design and Performance Research of WO₃ Hydrogen Gasochromic Film Prepared by Solvothermal Synthesis Assisted with Electrodeposition of Seed Layer