fig1

Figure 1. (A) Structure illustration of a LaNi_5.5+x; (B) Hydrogenation process of NEC on LaNi₅H_x at 7 MPa H₂; (C) Dehydrogenation process of 12H-NEC on LaNi₅ at 0.1 MPa H₂. Reproduced from Ref^[21]. Copyright (2021), with permission from Elsevier; (D) The Co 2p XP spectra of ZrCoH_1.2 measured at 1.0 mbar H₂, at 25 and 240 °C, respectively; (E) Reaction path for ZrCoH_x catalyst in CO₂ reduction. Reproduced from Ref^[25]. Copyright (2016), with permission from John Wiley and Sons. NEC: N-ethylcarbazole.