Ultrafast CO Sensor Based on Flame-annealed Porous CeO2 Nanosheets for Environmental Application

Pengpeng LI; Bing WANG; Yingde WANG

doi:10.15541/jim20210142

Journals >Journal of Inorganic Materials >Volume 36 >Issue 11 >Page 1223 > Article

Journal of Inorganic Materials
Vol. 36, Issue 11, 1223 (2021)

Ultrafast CO Sensor Based on Flame-annealed Porous CeO₂ Nanosheets for Environmental Application

Pengpeng LI, Bing WANG^*, and Yingde WANG^*

Author Affiliations

Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

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DOI: 10.15541/jim20210142 Cite this Article

Pengpeng LI, Bing WANG, Yingde WANG. Ultrafast CO Sensor Based on Flame-annealed Porous CeO₂ Nanosheets for Environmental Application [J]. Journal of Inorganic Materials, 2021, 36(11): 1223 Copy Citation Text

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Schematic illustration of preparation of CeO2 nanosheets

1. Schematic illustration of preparation of CeO₂ nanosheets

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XRD patterns of the flame-annealed CeO2 nanosheets

2. XRD patterns of the flame-annealed CeO₂ nanosheets

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3. XPS spectra of the CeO₂ NSs (a, b, c) high resolution spectra of O 1s of CeO₂-0.5min NSs, CeO₂-2min NSs and CeO₂-5min NSs; (d, e, f) high resolution spectra of Ce 3d of CeO₂-0.5min NSs, CeO₂-2min NSs and CeO₂-5min NSs

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4. Morphologies and structure characterizations of the as-prepared samples(a, b, c) TEM images of CeO₂-0.5min NSs, CeO₂-2min NSs and CeO₂-5min NSs (pores are labelled by red dotted circles); (d, e, f) HRTEM images of CeO₂-0.5min NSs, CeO₂-2min NSs and CeO₂-5min NSs

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5. (a) Nitrogen adsorption-desorption isotherms and (b) pore size distributions of CeO₂ NSs

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6. EPR spectra of CeO₂ NSs

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7. Gas sensing properties of CeO₂ NSs (a) Response of CeO₂ NSs at different temperatures from 300 ℃ to 500 ℃ with an interval of 50 ℃ towards 500 μL/L CO; (b) Response of CeO₂-2min NSs towards 500 μL/L CO at 450 ℃ for seven periods; (c) Transient response of CeO₂-2min NSs towards different concentration from 10 μL/L to 10000 μL/L at 450 ℃; (d) Fitting of CO concentration and its corresponding response; (e) Determination of response/recovery time of CeO₂-2min NSs towards 500 μL/L CO at 450 ℃; (f) Selectivity of CeO₂-2min NSs towards CH₄, H₂, NH₃, NO₂ and CO at 450 ℃

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8. Schematic illustration of CO gas sensing mechanism Yellow spheres represent O atoms; Orange spheres represent Ce atoms; Red rings represent the position of oxygen vacancies

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S1. XRD pattern of the intermediate product

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S2. Response of CeO₂-2min NSs towards 500 μL/L CO at 450 ℃ under different humidities

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S3. Long-term stability of CeO₂-2min NSs towards 500 μL/L CO at 450 ℃ for two weeks

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	O_S/%	O_V/%	Ce³⁺/%	Ce³⁺/Ce⁴⁺
CeO₂-0.5min NSs	19.0	40.0	26.3	0.357
CeO₂-2min NSs	14.8	43.2	28.6	0.401
CeO₂-5min NSs	15.1	42.7	23.8	0.312

Table 1.

Percentage of each element species to the whole element content

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Material	Concentration/(μL∙L^-1)	Temperature/℃	Sensitivity	(Response/recovery time)/s	Ref.
Co₃O₄ nanostructures	5	100	2.4^a	14/36	[23]
Pd/SnO₂	100	100	3.5^a	60/150	[24]
TiO₂-CeO₂ mixed oxides	400	200	10.7^a	32/45	[25]
SnO₂/MoO₂	100	RT	9.2%^b	20/16	[1]
SnO₂-CeO₂ mixed oxides	500	430	190%^b	26/30	[11]
Pd/SnO₂ nanowires	200	400	6.8^a	5/40	[26]
ZnO nanorods	30	400	1.1^a	46/27	[27]
Porous CeO₂ nanosheets	500	450	12.0%^b	2/2	This work

Table 1.

Recent materials for in CO gas sensing

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	Surface area/(m²∙g^-1)	Pore volume/ (cm³∙g^-1)	Average pore diameter/nm
CeO₂-0.5min NSs	73.344	0.172	10.1
CeO₂-2min NSs	46.804	0.181	15.5
CeO₂-5min NSs	40.836	0.163	15.8

Table 2.

Summary of surface area and pore volume of CeO₂ NSs

Pengpeng LI, Bing WANG, Yingde WANG. Ultrafast CO Sensor Based on Flame-annealed Porous CeO₂ Nanosheets for Environmental Application [J]. Journal of Inorganic Materials, 2021, 36(11): 1223

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