Unraveling compensation between electron transfer and strain in Ni-Ag-MoS₂ photocatalyst
Rani, Ekta; Gupta, Vandna K.; Thasfiquzzaman, Md; Talebi, Parisa; Martinelli, Anna; Niu, Yuran; Zakharov, Alexei; Huttula, Marko; Patanen, Minna; Singh, Harishchandra; Cao, Wei (2022-09-09)
Rani, E., Gupta, V. K., Thasfiquzzaman, M., Talebi, P., Martinelli, A., Niu, Y., Zakharov, A., Huttula, M., Patanen, M., Singh, H., & Cao, W. (2022). Unraveling compensation between electron transfer and strain in Ni-Ag-MoS2 photocatalyst. Journal of Catalysis, 414, 199–208. https://doi.org/10.1016/j.jcat.2022.09.006
© 2022 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2022100761347
Tiivistelmä
Abstract
Despite the boom in catalytic response via constructing interfaces, understanding interfaces’ interaction in heterostructures is still a paradox. In this work, the interaction of Ni with MoS₂ in Ni-Ag-MoS₂ heterostructure are unveiled through synchrotron X-PEEM and what’s more, the missing interaction mechanism at the Ag-MoS₂ interface is probed via Raman mapping. The observed competition between the downshift of the E2g¹ and A1g modes due to charge carrier injection and the upshift of the E2g¹ and A1g modes due to compressive strain during reverse laser power experiment is assigned to the non-uniform growth of Ag nanoparticles, their intimate contact with MoS₂, and Ag intercalated layered MoS₂. The substantial improvement of the H₂ yield of the Ni-Ag-MoS₂ (∼55 μmol h−1 g−1) over the pristine MoS₂ and the binary Ag-MoS₂ evidence successful bonding of Ni, Ag and MoS₂. This study highlights the importance of considering both electronic coupling and strain to optically tune electromechanical properties of MoS₂.
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