Abstract
We reported a new layered ZnCo1.5(OH)4.5Cl0.5·0.45H2O which crystallizes in two-dimensional (2D) nanosheets morphology in our previous work. Herein, two-dimensional hexagonal ZnCo2O4 nanosheets were synthesized by the thermal transformation of the ZnCo1.5(OH)4.5Cl0.5·0.45H2O precursor. Benefiting from this special hexagonal nanosheet morphology, the as-prepared ZnCo2O4 electrode has induced a pseudo-capacitance contribution, leading to a stable discharge capacity of 688 mAh g−1 (at 5.0 A g−1) over 1000 cycles. To the best of our knowledge, the rate performance of ZnCo2O4 for lithium ion batteries (LIBs) is superior to those of previously reported ZnCo2O4 electrodes. Further applied to sodium ion batteries, ZnCo2O4 electrode show fascinating performance with the specific capacity of 463 mAh g−1 after 60 cycles. This study provides a promising strategy for developing high-quality ZnCo2O4 nanosheet electrodes for long-cycle-life and high-power LIBs and sodium ion batteries (SIBs).
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