首页|(162774)Facilely synthesized honeycomb-like NiCo_2O_4 nanoflakes with an increased content of oxygen vacancies as an efficient cathode catalyst for Li-O_2 batteries
(162774)Facilely synthesized honeycomb-like NiCo_2O_4 nanoflakes with an increased content of oxygen vacancies as an efficient cathode catalyst for Li-O_2 batteries
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NSTL
Elsevier
The development of high energy density Li-O_2 batteries is restricted by the sluggish kinetics of both the oxygen reduction reaction and the oxygen evolution reaction, and developing an efficient cathode catalyst is the key to resolving this issue. In present study, interconnected honeycomb-like NiCo_2O_4 nanoflakes are synthesized by facile electrochemical deposition on carbon cloth (CC) and subsequent heat treatment. Compared with NiO and Co_3O_4, suitably sized NiCo_2O_4 nanoflakes benefit from a vital synergistic effect of components Co and Ni and are expected to show superior OER/ORR performance. The presence of redox couples Co~(3+)/Co~(2+) and Ni~(2+)/Ni~(3+) and abundant oxygen vacancies in NiCo_2O_4 allow Li-O_2 batteries deliver satisfactory cycle durability and high discharge/recharge capacities. Li-O_2 batteries that use the NiCo_2O_4/CC cathodes exhibit high specific discharge capacities of 8388 mA h g~(-1) and 5238 mA h g~(-1) at 200 mA g~(-1) and 400 mA g~(-1) respectively, and deliver a long lifetime of 102 cycles with a capacity limit of 500 mA h g~(-1) at 340 mA g~(-1) thereby suggesting that honeycomb-like NiCo_2O_4 nanoflakes are a promising cathode catalyst.
NSTL
Elsevier
