Citation: Jing Jin, Jie Yin, Hanwen Liu, Pinxian Xi. Synthesis of silk-like FeS₂/NiS₂ hybrid nanocrystals with improved reversible oxygen catalytic performance in a Zn-air battery[J]. Chinese Journal of Catalysis, ;2019, 40(1): 43-51. doi: 10.1016/S1872-2067(18)63175-4 shu

Synthesis of silk-like FeS₂/NiS₂ hybrid nanocrystals with improved reversible oxygen catalytic performance in a Zn-air battery

State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, China

Received Date: 7 September 2018
Revised Date: 8 October 2018

Fund Project: This work was supported by the National Basic Research Program of China (21571089, 21503102, 51571125), and the Fundamental Research Funds for the Central Universities (lzujbky-2016-k02, lzujbky-2018-k08, lzujbky-2017-it42).

The development of highly active and stable reversible oxygen electrocatalysts is crucial for improving the efficiency of metal-air battery devices. Herein, an efficient liquid exfoliation strategy was designed for producing silk-like FeS₂/NiS₂ hybrid nanocrystals with enhanced reversible oxygen catalytic performance that displayed excellent properties for Zn-air batteries. Because of the unique silk-like morphology and interface nanocrystal structure, they can catalyze the oxygen evolution reaction (OER) efficiently with a low overpotential of 233 mV at j=10 mA cm^-2. This is an improvement from the recently reported catalysts in 1.0 M KOH. Meanwhile, the oxygen reduction reaction (ORR) activity of the silk-like FeS₂/NiS₂ hybrid nanocrystals showed an onset potential of 911 mV and a half-wave potential of 640 mV. In addition, the reversible oxygen electrode activity of the silk-like FeS₂/NiS₂ hybrid nanocrystals was calculated to be 0.823 V, based on the potential of the OER and ORR. Further, the homemade rechargeable Zn-air batteries using FeS₂/NiS₂ hybrid nanocrystals as the air-cathode displayed a high open-circuit voltage of 1.25 V for more than 17 h and an excellent rechargeable performance for 25 h. The solid Zn-air batteries exhibited an excellent rechargeable performance for 15 h. This study provided a new method for designing interface nanocrystals with a unique morphology for efficient multifunctional electrocatalysts in electrochemical reactions and renewable energy devices.
- Silk-like,
- FeS₂/NiS₂,
- Interface nanocrystal,
- Reversible oxygen electrocatalyst,
- Zn-air battery
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Synthesis of silk-like FeS2/NiS2 hybrid nanocrystals with improved reversible oxygen catalytic performance in a Zn-air battery

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通讯作者: 陈斌, bchen63@163.com

Synthesis of silk-like FeS₂/NiS₂ hybrid nanocrystals with improved reversible oxygen catalytic performance in a Zn-air battery