fig12

Figure 12. (A) ESR spectra over pure CuInS₂, CuInS₂-7MX, and V_S CuInS₂-7MX; (B) Calculated electrostatic potentials of CuInS₂ (112) slab and Ti₃C₂O₂ (Φ represents the work function); (C) Differences in charge density of CuInS₂ and Ti₃C₂O₂; (D) S 2p XPS spectra of pure CuInS₂ (top) and V_S CuInS₂-Ti₃C₂T_x (bottom); (E) CO₂ photoreduction performances and corresponding selectivity over M’In₂S₄-7MX (M’ = Cu, Ca, Cr, Mn, Co, Zn, and Cd); (F) The binding energies and the difference of charge density between CO₂ and (left) perfect CuInS₂ (112) slab or (right) CuInS₂ (112) slab with V_S; (G) The photo-induced N_D, and (H) photocatalytic CO₂-to-CO reduction performance over pure CuInS₂, CuInS₂-7MX, and V_S CuInS₂-7MX under visible-NIR light irradiation (λ > 420 nm). (A-H) Reproduced with permission^[38]. Copyright Elsevier. ESR: Electron spin resonance; XPS: X-ray photoelectron spectroscopy; N_D: carrier concentration.