Journal
ENERGY TECHNOLOGY
Volume 7, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201900123
Keywords
bifunctional oxygen electrocatalysts; Fe-N-doped graphene; H-montmorillonite nanoreactors; OER; ORR; Zn-air batteries
Categories
Funding
- National Natural Science Foundation of China [21776167, 21805170, 21276148]
- State Key Laboratory of Chemical Engineering (Tianjin University) [SKL-ChE-14B01]
- Chemical Engineering and Technology First-class Subject of Shandong Province
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Developing a green, cost-efficient air-cathode catalyst with high oxygen evolution and reduction reaction (OER/ORR) performance for rechargeable Zn-air batteries (ZABs) has gained attention. Iron-containing nitrogen-doped graphene (Fe/N-G) that contains Fe-N-x coordination sites is prepared by pyrolyzing the complex of iron ion and PANI sheets intercalated with the unique layer gaps of H-montmorillonite nanoreactors. The transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis confirm that there are no crystalline materials, such as iron lattice, iron carbide, or iron nitride. The as-prepared Fe/N-G show a high electrocatalytic activity in ORR with a 4e(-) transfer process and the half-wave potential of Fe/N-G (0.877 V vs reversible hydrogen electrode-RHE), which is better than that of Pt/C in oxygen saturated 0.1 m KOH solution. In an acid electrolyte, the Fe/N-G possesses a half-wave potential similar to that of 20 wt% Pt/C. For OER, the Fe/N-G exhibits the overpotential of 400 mV versus RHE at 10 mA cm(-2). However, the Fe/N-G as the air-cathode of the homemade rechargeable ZABs exhibits a high power density (156.8 mW cm(-2)) and an excellent long discharge-charge cycling stability (787 cycles) at 20 mA cm(-2). This work provides an inspiring guideline to prepare a high-performance bifunctional air-cathode for a rechargeable ZAB.
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