Journal
ADVANCED ENERGY MATERIALS
Volume 8, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201800955
Keywords
bifunctional air electrodes; charge-discharge stability; oxygen evolution reaction; oxygen reduction reaction; Zn-air batteries
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Funding
- Shanghai Sailing Program [17YF1412700]
- National Natural Science Foundation of China [51572172, 11674061, 51471051]
- Young Teachers in Shanghai Colleges and Universities [ZZslg16062]
- Cultivation fund of University of Shanghai for Science and Technology [ZR18PY06]
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Efficient bifunctional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts are of great importance for rechargeable metal-air batteries. Herein, FeNx/C catalysts are synthesized by pyrolysis of thiourea and agarose containing alpha-Fe2O3 nanoplate as Fe precursor, where alpha-Fe2O3 nanoplate can prevent the aggregation of carbon sheets to effectively improve the specific surface area during the carbonization process. The FeNx/C-700-20 catalyst displays excellent catalytic performance for both ORR and OER activity in alkaline conditions with more positive onset potential (1.1 V vs the reversible hydrogen electrode) and half-wave potential, higher stability, and stronger methanol tolerance in alkaline solution, which are all superior to that of the commercial Pt/C catalyst. In this study, the detailed analyses demonstrate that the coexistence of Fe-based species and high content of Fe-N-x both play an important role for the catalytic activity. Furthermore, FeNx/C-700-20 as cathode catalyst in Zn-air battery possesses higher charge-discharge stability and power density compared with that of commercial Pt/C catalyst, displaying great potential in practical implementation of for the rechargeable energy devices.
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