Fig. 4: The catalyst performance with respect to the state of the art.

Comparisons of the average TOF values and of the cost-normalized TOF for the CuFeS2 catalyst and for previously reported ones, under photocatalytic conditions (Greek alphabet letters in green) and under elevated temperature and H2 pressure conditions (Latin alphabet letters in blue). α, ref. 40; β, ref. 41; γ, ref. 42; δ, ref. 23; ε, ref. 43; ζ, ref. 44; η, ref. 45; θ, ref. 46; ι, ref. 47; κ, ref. 14; λ, ref. 48; μ, ref. 16, ξ, ref. 49; ο, ref. 21; π, ref. 9; σ, ref. 8; τ, ref. 17; υ, ref. 15; φ, ref. 22; a, ref. 5; b, ref. 6; c, ref. 13; d, ref. 10; e, ref. 12; f, ref. 7; g, ref. 11 and h, ref. 50: more details are given in Supplementary Table 1.