A highly sensitive VOC gas sensor using p-type mesoporous Co3O4 nanosheets prepared by a facile chemical coprecipitation method

Deng, Shuduan; Xu, Lei; Chen, Nan; Deng, Dongyang; Xiao, Xuechun; Wang, Yude

doi:10.1016/j.snb.2016.04.138

Cited by 146 publications

(42 citation statements)

References 42 publications

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“…In addition, the C 1s peak can be observed at 285.6 eV because of the CANACo formation [57]. The N-doped carbon was also evidently proved by C 1s XPS spectra that the CAN formation which causes the adsorption of water on the catalyst surface was observed for the O1s XPS spectra of N-doped carbon of Co 3 O 4 ; this can be attributed to the formation of physical and chemical adsorption, O adsorbates on the surface of defects [25,59].…”

Section: Catalyst Characterizationmentioning

confidence: 83%

“…Furthermore, SO 4 ÀÅ has a longer half-life, mainly because of its preference for electron transfer reactions while Å OH participates in a variety of reactions with equal preference [5,23]. P-type metal oxide semiconductors have drawn wide attention, such as Co 3 O 4 , as important magnetic materials [4,24,25]. This is widely used in lithium-ion batteries anode materials, solar energy absorption materials, solid state sensors, heterogeneous catalysis, and magnetic materials among others [25].…”

Section: Introductionmentioning

confidence: 99%

“…P-type metal oxide semiconductors have drawn wide attention, such as Co 3 O 4 , as important magnetic materials [4,24,25]. This is widely used in lithium-ion batteries anode materials, solar energy absorption materials, solid state sensors, heterogeneous catalysis, and magnetic materials among others [25]. Owing to its outstanding oxidation capacity because of its low valence band maximum (VBM), Co 3 O 4 has been used as an excellent catalytic material [1].…”

Section: Introductionmentioning

confidence: 99%

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Direct fabrication of lamellar self-supporting Co3O4/N/C peroxymonosulfate activation catalysts for effective aniline degradation

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Section: Catalyst Characterizationmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Direct fabrication of lamellar self-supporting Co3O4/N/C peroxymonosulfate activation catalysts for effective aniline degradation

Huang

Zhang

et al. 2017

Chemical Engineering Journal

107

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“…However, significantly lower activities in the VOCs combustion are achieved in their presence. The most commonly studied metal oxide catalysts include Co- [5,[22][23][24][25], Cu- [5,22,26], Mn- [5,22,25], Ce- [5,12,16,26], and Fe-containing materials [21,22]. It has been found that a suitable chosen support with controlled porosity favors high dispersion of active phase and enhanced activity in the total oxidation of VOCs [27][28].…”

mentioning

confidence: 99%

Cobalt-containing BEA zeolite for catalytic combustion of toluene

Rokicińska

Drozdek

Dudek

et al. 2017

Applied Catalysis B: Environmental

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GRAPHICAL ABSTRACT Highlights-Controlled amounts of cobalt were homogeneously introduced in BEA structure.-Various forms of Co species were identified in Co-containing BEA structure.-After saturation of framework sites Co formed oxide clusters and crystallites.-The presence of Lewis acid sites resulted in enhanced selectivity to CO and benzene.-The highest activity showed Co-containing SiBEA with dominant contribution of Co3O4. AbstractCo-containing HAlBEA zeolite was obtained by conventional wet impregnation of HAlBEA zeolite with an aqueous Co(NO3)2 . 6 H2O solution, whereas Co-containing SiBEA zeolites were prepared by a two-step post-synthesis method. This approach consists of, in the first step, dealumination of parent BEA zeolite to obtain an aluminum-free SiBEA support and then, in the subsequent step, contact of the obtained material with an aqueous solution of cobalt nitrate. As shown by X-ray diffraction and low-temperature N2 adsorption, the dealumination of BEA zeolite and introduction of cobalt ions did not involve destruction of zeolite structure, and only insignificant blocking of pore system was observed after introduction of high amounts of cobalt. Nevertheless, clear changes in acidity were found by FTIR of pre-adsorbed pyridine after dealumination of parent BEA zeolite and introduction of cobalt ions. The presence of Lewis acid sites resulted in enhanced selectivity to CO and benzene formed as by-products in the toluene combustion. Therefore, SiBEA zeolite was chosen as a support for an introduction of various amounts of Co into the zeolite structure (the intended Co contents of 3.0 -9.0 wt %). Depended on the amount of the introduced Co, cobalt was incorporated into the framework of BEA zeolite as isolated mononuclear Co(II) species, small Co(II) oxide clusters and/or Co3O4 crystallites distributed in the whole zeolite structure.The chemical environment and dispersion of cobalt species were studied by transmission electron microscopy (TEM), FTIR of pre-adsorbed NO, UV-vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy (XPS). Temperature-programmed reduction of hydrogen (H2-TPR) was also performed to determine reducibility of the Cocontaining SiBEA zeolites. It was confirmed that siliceous SiBEA zeolite was the excellent support of Co3O4, which was in turn recognized as the main active phase in the total oxidation of toluene. The best catalytic performance was achieved over the catalysts containing at least 0.05 mmol of Co in the form of Co3O4 per 1 g of SiBEA zeolite.

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“…8(b)) and ALCW (23.2, Fig. 8(c)) for 5 ppm methanol at the best working temperature, compared to the reported values, and a good response is observed, as shown in Table 3 34–41 . All four sensors exhibit good selectivity to methanol.…”

Section: Introductionmentioning

confidence: 62%

Design of ultrasensitive Ag-LaFeO3 methanol gas sensor based on quasi molecular imprinting technology

Qiu

Zhang

et al. 2018

Sci Rep

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An ultrasensitive methanol gas sensing device based on the quasi-molecular imprinting technology (quasi-MIT) is studied in this work. We applied the sol-gel method (ALS denotes Ag-LaFeO3 prepared by the sol-gel method) and combustion synthesis (ALC denotes Ag-LaFeO3 prepared by combustion synthesis) to prepare Ag-LaFeO3 based sensors. The morphologies and structures of the Ag-LaFeO3 materials were examined via various detection techniques. The ALSM and ALCM sensor (ALSM and ALCM denotes the devices prepared by coating the ALS and ALC materials with methanol, respectively) fabricated using the sol-gel method and combustion synthesis combined with quasi-MIT exhibit good gas sensing properties to methanol, in contrast with the two devices (ALSW and ALCW denote the devices prepared for coating the ALS and ALC materials with water, respectively) without the use of quasi-MIT. The results show that quasi-MIT introduced the target gas in the fabrication process of the device, playing an important role in the design of the ultrasensitive methanol gas sensor. The sensing response and the optimum working temperature of ALSM and ALCM gas sensor are 52.29 and 155 °C and 34.89 and 155 °C, respectively, for 5 ppm methanol, and the highest response to other gases is 8. The ALSM and ALCM gas sensors reveal good selectivity and response for methanol.

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A highly sensitive VOC gas sensor using p-type mesoporous Co3O4 nanosheets prepared by a facile chemical coprecipitation method

Cited by 146 publications

References 42 publications

Direct fabrication of lamellar self-supporting Co3O4/N/C peroxymonosulfate activation catalysts for effective aniline degradation

Direct fabrication of lamellar self-supporting Co3O4/N/C peroxymonosulfate activation catalysts for effective aniline degradation

Cobalt-containing BEA zeolite for catalytic combustion of toluene

Design of ultrasensitive Ag-LaFeO3 methanol gas sensor based on quasi molecular imprinting technology

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