MOF-derived iron as an active energy storage material for intermediate-temperature solid oxide iron–air redox batteries

We here demonstrate that the iron derived from an iron-based metal-organic framework (MOF), with exposed high-density Fe-atom planes, exhibits improved reduction activity, enabling good rechargeability of solid oxide iron-air redox batteries at 500 °C. The discharge mass specific energies are 226.5 W h kg-1-Fe and 214.8 W h kg-1-Fe at C/4 and C/3, respectively, at a constant Fe-utilization of 20%.