Construct an Ellingham diagram for the thermal splitting of water (H₂O(g) → H₂(g) + ½ O₂(g)) by using Δ_rH^⦵ = +260 kJ mol⁻¹; Δ_rS^⦵ = +60 J K⁻¹ mol⁻¹ (you may assume that Δ_rH^⦵ is independent of temperature). Hence, calculate the temperature at which H₂ may be obtained by spontaneous decomposition of water (Chem. Rev., 2007, 107, 4048). Comment on the feasibility of producing H₂ by this means.