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Figure 10. (A) Schematic illustration for the preparation of the FeSA/MXene. (B) AC-TEM image of FeSA/MXene. (C) High resolution XPS spectra of Fe 2p on FeSA/MXene. (D) XANES spectra of FeSA/MXene at the Fe K-edge. (E) EXAFS spectra of FeSA/MXen at the Fe K-edge. (F) Gibbs free energy barrier diagram of NO₃^-RR and (Inset) HER for Fe₁Cu₂@MXenes. (G) The NH₃ selectivity, NO₃^- removal rate and FE of FeSA/MXene under different potentials. Reproduced with permission from Ref.^[75]. Copyright 2023 American Chemical Society. (H) Top view and side view of the most stable structure (Ti₃C₂O₂). (I) Binding energy (E_b) and dissolution potential (U_diss) of Ti₃C₂O₂-TM_SA. (J) Adsorption energy of Ti₃C₂O₂-TM_SA for NO₃^-. Reproduced with permission from Ref.^[76]. Copyright 2023 Springer Nature. (K) Comparison of adsorption energies on TM/Ov-MXene for NO₃^- and H⁺. (L) Gibbs free energy barrier diagram of NO₃^-RR Ag/Ov-MXene. (M) PDOS diagram of Ag/Ov-MXene adsorption for NO₃^-. Reproduced with permission from Ref.^[77]. Copyright 2023 Wiley-VCH.