期刊
FUEL
卷 316, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.123328
关键词
Bifunctional catalyst; Zn-air battery; ZIF8/ZIF67; Vulcanization; Porous carbon; Carbon nanotube
资金
- Ministry of Science and Technology, Taiwan [MOST 1063113-E-239-001]
- Advanced Institute of Manufacturing with High-tech Innovations (AIM-HI) from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan
Catalysts with embedded and functionalized elements play a crucial role in controlling oxygen-reduction and oxygen-evolution reactions for the development of high-performance ZABs. In this study, carbon nanotube-grafted, Co-Fe embedded, nitrogen-doped porous carbon nano-frameworks were synthesized and exhibited superior OER and ORR performance. A ZAB with a hybrid catalyst of these nano-frameworks achieved excellent discharge capacity, power density, and cycle stability compared to a ZAB with traditional Pt/C + RuO2 catalyst.
Catalysts with embedded and functionalized elements used for the effective control of oxygen-reduction (ORRs) and oxygen-evolution reactions (OERs) are the key to developing high-performance rechargeable Zn-air batteries (ZABs). Here, carbon nanotube-grafted, Co-Fe embedded, nitrogen-doped porous carbon nano-frameworks (CNT-Co-Fe/NC) were synthesized through the carbonization of Fe-doped zeolitic imidazolate frameworks and vulcanization of the CNT-Co-Fe/NC to form CNT-CoS2-Fe/NC. The CNT-CoS2-Fe/NC exhibited a superior OER performance with an overpotential of only 1.637 mV at a current density of 10 mA/cm(2) and a Tafel slope of 197 mV/dec (which, for RuO2, is 112 mV/dec), whereas the CNT-Co-Fe/NC showed an excellent ORR performance with a Tafel slope of 71 mV/dec (which, for 20 wt% Pt/C, is 91 mV/dec). A ZAB was developed with a hybrid catalyst of 50 wt% CNT-Co-Fe/NC and 50 wt% CNT-CoS2-Fe/NC in the cathode, and it achieved an excellent specific discharge capacity of 814 mAh/g at 50 mA/cm(2), high power density of 245 mW/cm(2), and outstanding cycle stability of over 1800 cycles (300 h) at 10 mA/cm(2) with a very high retention of 95% and small potential gap of 0.68 V, compared to the corresponding values of 803.7 mAh/g, 215.3 mW/cm(2), 900 cycles: retention 92%, and potential gap 0.837 V for 150 h for the ZAB with a hybrid catalyst of Pt/C + RuO2. It is hypothesized that the ZAB with the novel hybrid catalyst exhibits its excellent catalytic activity and durability as a result of the synergistic effect of the catalyst's embedded heteroatoms and nitrogen-metal/carbon framework that enhances the ORR/OER performance, porous carbon nano-framework that enables rapid diffusion and electrical conduction, and carbon nanotubes that complete the external electrical connection between the catalysts.
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