Journal
CHEMICAL ENGINEERING JOURNAL
Volume 413, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127439
Keywords
NiMn2O4-based Ni-Mn bimetallic oxides; Oxygen reduction reaction; Al-air battery
Categories
Funding
- China Aerospace Science Fund [CASF170101]
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This study successfully prepared low-cost NiMn2O4-based Ni-Mn bimetallic oxides using a hydrothermal-calcination method. The Ni-Mn-600 sample showed high oxygen reduction reaction onset potential and half-wave potential, demonstrating excellent catalytic performance in aluminum-air batteries.
To date, research on air battery catalysts has been mainly focused on finding materials with a high oxygen reduction reaction (ORR) catalytic activity. However, the high cost of platinum catalysts restricts their commercialization. Herein, we report a simple hydrothermal-calcination method to fabricate low-cost NiMn2O4 -based Ni-Mn bimetallic oxides. The Ni-Mn-600 sample showed a high onset potential (1.01 V vs. RHE), which was more positive than that for 20 wt% Pt/C (0.97 V vs. RHE), and its half-wave potential (0.78 V vs. RHE) was comparable to that for 20 wt% Pt/C (0.84 V vs. RHE). Moreover, Ni-Mn-600 as an Al-air battery air-cathode catalyst exhibited a high discharge plateau of 1.42 V and peak power density of 100.45 mW cm(-2), which out-performed those for 20 wt% Pt/C (1.34 V and 76.10 mW cm(-2)). The high ORR electrocatalytic activity of Ni-Mn600 may be attributed to the nanorod morphology and high ratio of (Mn3++Mn4+)/Mn2+ and Ni3+/Ni2+. This work demonstrated that NiMn2O4-based Ni-Mn bimetallic oxides as cathode catalysts have good research prospects in aluminum-air batteries and other energy applications.
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