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. 2021 Sep 6;13:189. doi: 10.1007/s40820-021-00703-6

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a Operando XANES spectra at the Sn K-edge. b Operando k²-weighted FT spectra at the Sn K-edge. c Operando SR-FTIR spectra of the SnS_2-xO_x/CC under the working condition. d Schematic of the whole CO₂RR mechanism on SnS_2-xO_x nanosheets. e Gibbs free energy diagrams for CO₂ reduction to HCOOH on SnS₂ and SnS_2-xO_x slabs. f Projected density of states (PDOS) of HCOO* adsorbed on the SnS₂ and SnS_2-xO_x slabs. The * represents an adsorption site