University of Oulu

Greco, R., Baxauli-Marin, L., Temerov, F., Daboczi, M., Eslava, S., Niu, Y., Zakharov, A., Zhang, M., Li, T., & Cao, W. (2023). Activation of 2D cobalt hydroxide with 0D cobalt oxide decoration for microplastics degradation and hydrogen evolution. Chemical Engineering Journal, 471, 144569.

Activation of 2D cobalt hydroxide with 0D cobalt oxide decoration for microplastics degradation and hydrogen evolution

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Author: Greco, Rossella1; Baxauli-Marin, Lucía1; Temerov, Filipp1;
Organizations: 1Nano and Molecular Systems Research Unit, Faculty of Science, University of Oulu, FIN 90014, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.2 MB)
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Language: English
Published: Elsevier, 2023
Publish Date: 2023-08-24


The 2D semiconductors are important players in environmental and energy fields due to their unique catalytic and physical properties defined by their dimensionality. Versatile functionalities on one 2D matrix will enlarge its application scopes but require dedicated engineering paths. In this work, we present a cross-dimensional strategy by decorating 0D Co₃O₄ onto 2D Co(OH)₂ to form a multifunctional photocatalyst. The one-pot hydrothermally synthesized Co₃O₄@Co(OH)₂ composite is capable of degrading polystyrene microplastics with an efficiency of 40% under 0.495 W white LED illumination. In a separated experiment, H₂ evolution reaction from water splitting was evaluated in absence of sacrificial agents leading to 43 μmolg⁻¹ and to an apparent quantum efficiency of 3.48% at 420 nm. The study of the energy band diagrams by UV–Visible and ambient photoemission spectroscopy and the analysis of the radicals involved in the reaction of photocatalytic degradation allow to unveil the mechanisms for both the processes herein studied. Finally, we could confirm that the heterostructure benefits the redox potentials of 2D and 0D counterparts and facile electron transfers when crossing two different dimensions. These results provide guidelines and inspiration for cross-dimensional activations of low-dimensional materials for versatile functionalities.

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Series: Chemical engineering journal
ISSN: 1385-8947
ISSN-E: 1873-3212
ISSN-L: 1385-8947
Volume: 471
Article number: 144569
DOI: 10.1016/j.cej.2023.144569
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: R.G., F.T., and W.C. acknowledge financial support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 101002219). S.E. and M.D. acknowledge the EPSRC grant EP/S030727/1 for financial support. Authors gratefully acknowledge the Center of Materials Analysis (CMA), University of Oulu and Biocenter, University of Oulu, for the characterization techniques and LC-MS analysis. R.G. acknowledges Javier Fernández-Catalá and Romain Botella for the useful discussions during the sample optimization. We acknowledge MAX IV Laboratory for time on Beamline [MAXPEEM] under Proposal [20210172]. Research conducted at MAX IV, a Swedish national user facility, is supported by the Swedish Research council under contract 2018-07152, the Swedish Governmental Agency for Innovation Systems under contract 2018-04969, and Formas under contract 2019-02496.
EU Grant Number: (101002219) CATCH - Cross-dimensional Activation of Two-Dimensional Semiconductors for Photocatalytic Heterojunctions
Copyright information: © 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (