Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/155656
Title: Elucidating the strain–vacancy–activity relationship on structurally deformed Co@CoO nanosheets for aqueous phase reforming of formaldehyde
Authors: Qian, Kaicheng
Yan, Yong
Xi, Shibo
Wei, Tong
Dai, Yihu
Yan, Xiaoqing
Kobayashi, Hisayoshi
Wang, Sheng
Liu, Wen
Li, Renhong
Keywords: Engineering::Chemical engineering
Issue Date: 2021
Source: Qian, K., Yan, Y., Xi, S., Wei, T., Dai, Y., Yan, X., Kobayashi, H., Wang, S., Liu, W. & Li, R. (2021). Elucidating the strain–vacancy–activity relationship on structurally deformed Co@CoO nanosheets for aqueous phase reforming of formaldehyde. Small, 17(51), 2102970-. https://dx.doi.org/10.1002/smll.202102970
Journal: Small
Abstract: Lattice strain modulation and vacancy engineering are both effective approaches to control the catalytic properties of heterogeneous catalysts. Here, Co@CoO heterointerface catalysts are prepared via the controlled reduction of CoO nanosheets. The experimental quantifications of lattice strain and oxygen vacancy concentration on CoO, as well as the charge transfer across the Co-CoO interface are all linearly correlated to the catalytic activity toward the aqueous phase reforming of formaldehyde to produce hydrogen. Mechanistic investigations by spectroscopic measurements and density functional theory calculations elucidate the bifunctional nature of the oxygen-vacancy-rich Co-CoO interfaces, where the Co and the CoO sites are responsible for CH bond cleavage and OH activation, respectively. Optimal catalytic activity is achieved by the sample reduced at 350 °C, Co@CoO-350 which exhibits the maximum concentration of Co-CoO interfaces, the maximum concentration of oxygen vacancies, a lattice strain of 5.2% in CoO, and the highest aqueous phase formaldehyde reforming turnover frequency of 50.4 h-1 at room temperature. This work provides not only new insights into the strain-vacancy-activity relationship at bifunctional catalytic interfaces, but also a facile synthetic approach to prepare heterostructures with highly tunable catalytic activities.
URI: https://hdl.handle.net/10356/155656
ISSN: 1613-6810
DOI: 10.1002/smll.202102970
Rights: This is the peer reviewed version of the following article: Qian, K., Yan, Y., Xi, S., Wei, T., Dai, Y., Yan, X., Kobayashi, H., Wang, S., Liu, W. & Li, R. (2021). Elucidating the strain–vacancy–activity relationship on structurally deformed Co@CoO nanosheets for aqueous phase reforming of formaldehyde. Small, 17(51), 2102970, which has been published in final form at https://doi.org/10.1002/smll.202102970. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: embargo_20240308
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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File Description SizeFormat 
Co@CoO-Small revision v3-re.pdf
  Until 2024-03-08
Accepted manuscript2.65 MBAdobe PDFUnder embargo until Mar 08, 2024
Co@CoO-SI-Small revision v3-re.pdf
  Until 2024-03-08
Supporting Information3.14 MBAdobe PDFUnder embargo until Mar 08, 2024

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