Back to Search
Start Over
MOF-derived nitrogen-doped carbon-based trimetallic bifunctional catalysts for rechargeable zinc-air batteries.
- Source :
-
Nanotechnology . 9/18/2022, Vol. 33 Issue 40, p1-9. 9p. - Publication Year :
- 2022
-
Abstract
- Zinc-air battery (ZAB) is a promising new metal-air energy system, but the large overpotentials of oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) around the air electrode lead to their poor energy efficiency. Herein, a novel bifunctional oxygen electrocatalyst is reported with the preparation of a zeolite imidazolate framework (ZIF-67) derived trimetallic composites decorated nitrogen-doped carbon, which consist of NiFe alloy and Co nanoparticles. The ZIF-derived porous N-doped carbon shell can speed up the mass transfer efficiency. Whereas the electronic effect between the formed NiFe alloy and Co nanoparticles, as well as the N-doped carbon framework can enrich the active centers and enhance the electrical conductivity. As a result, the NiFe-Co@NC-450 catalyst shows superior performance manifested as a small potential gap (Î" E Â =Â 0.857 V) between the overpotential at 10 mA cmâ'2 (E j=10) for OER (460 mV) and half-wave potential (E 1/2) for ORR (0.833 V). The liquid ZABs exhibit a high specific capacity reaching 798 mAh/gZn and a stable cycling performance at 10 mA cmâ'2 for more than 200 h. Meanwhile, the NiFe-Co@NC-450 based flexible ZABs also presents robust flexibility and stability. This study has certain implications for the development of economical, powerful and stable bifunctional catalysts for ZABs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09574484
- Volume :
- 33
- Issue :
- 40
- Database :
- Academic Search Index
- Journal :
- Nanotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 158043440
- Full Text :
- https://doi.org/10.1088/1361-6528/ac7b98