Abstract: Developing high performance iron electrodes is still a challenge for nickel-iron batteries. In this work, we reported a high-performance iron electrode material derived from Fe/Co-MOF for the first time. As shown by XRD, SEM and TEM analysis, octahedral particles consisted of Fe3O4 phase and trace Fe-Co alloy were obtained by calcining the Fe/Co-MOF precursor. The improved performance of this hybrid as anode materials for nickel-iron batteries in comparison with the Fe-MOF alone was due to the incorporation of an appropriate amount of Co. It showed a discharge plateau at about 1.18 V, which was slightly higher than Fe-MOF (1.10 V). Despite the sharp capacity loss in initial 10 cycles, a stable capacity of 233.1 mAh·g-1 was obtained at a current density of 1.0 A·g-1 after 90 cycles, which was about 181.2 mAh·g-1 higher than that of Fe-MOF derived sample. The improved electrochemical properties may be attributed to the improved electronic conductivity and reduced ion transfer resistance.
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2018, Vol. 32 
