High-performance non-spinel cobalt–manganese mixed oxide-based bifunctional electrocatalysts for rechargeable zinc–air batteries
نویسندگان
چکیده
0.1016/j.nanoen.2 lsevier Ltd. All rig thors. uthor. : [email protected] Abstract Development of efficient bifunctional electrocatalysts from earth abundant elements, simultaneously active for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), remains to be a grand challenge for electrocatalysis. Herein we firstly synthesized a new type of bifunctional catalyst (NCNT/CoxMn1 xO) consisting of non-spinel cobalt–manganese oxide supported on N-doped carbon nanotubes through a simple non-surfactant assistant hydrothermal method. This hybrid catalyst exhibits much higher OER activity than that of IrO2, and comparable ORR activity to Pt/C with identical onset potential (0.96 V) in alkaline media. Furthermore, the NCNT/CoxMn1 xO catalyst was studied as a cathode in both primary and rechargeable zinc–air batteries demonstrating similar performance to commercial Pt/C or (Pt/C + IrO2), respectively. Primary zinc–air battery tests show a gravimetric energy density of 695 W h kg 1 Zn , and the rechargeable battery exhibits a high round-trip efficiency evidenced by a low discharge–charge voltage gap (0.57 V) at a current density of 7 mA cm . & 2015 Elsevier Ltd. All rights reserved.
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