Fabrication of the nitrogen doped nano-onion hybrids with Fe2O3 for the efficient oxygen reduction reaction in the zinc-air battery
발표자
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초록
내용
Zn–air batteries are promising as an alternative to lithium-ion secondary batteries but limited by their charge-discharge cycling efficiency and safety issues. Hence, in this study, nitrogen-doped nano-onions (NNOs) covalently bonded with Fe2O3 particles (NNO-c-Fe2O3) were fabricated for use as a cathode material of Zn–air batteries. Firstly, ONO-c-Fe2O3 were produced by reacting ONO functionalized with acyl chloride groups with Fe2O3 functionalized with amine groups. Then through the pyrolysis process of ONO-c-Fe2O3 with urea, NNO-c-Fe2O3 were produced. The formation was confirmed by XPS, HR-TEM, XRD and EDS. The electrochemical activities of the NNO-c-Fe2O3 were tested through half cell test and zinc-air battery test. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) were compared with those of the NNO and NNO mixture with Fe2O3 (NNO-m-Fe2O3). NNO-c-Fe2O3 exhibited better power density and bifunctional electrocatalytic activity in both of the ORR and OER.