Reaction steps of Mg–Cl complexes within THF solution during S-reduction.

No.	Equation	ΔG (eV)	ΔGper S
R31	Mg2+ + 3[MgCl2(THF)4] = 2[Mg2(μ-Cl)3(THF)6]+	−6.32	—
R57	2[Mg2(μ-Cl)3(THF)6]+ = 3[MgCl2(THF)4] + Mg2+	6.32	—
R58	Mg2+ + 3S82− + 2e− = 3S62− + MgS6	−10.64	−0.44
R59	Mg2+ + 2S62− + 2e− = 2S42− + MgS4	−10.21	−0.85
R60	Mg2+ + S42− + 2e− = S22− + MgS2	−9.17	−2.29
R61	Mg2+ + S22− + 2e− = S2− + MgS	−8.06	−4.03