期刊
Advanced Energy Materials
卷 6, 期 22, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201601052
关键词
gelatin; mass transfer; oxygen reduction reaction; Prussian blue analogue; Zn-air batteries
类别
资金
- MOTIE/KEIT, Korea [10042575]
- UNIST (Ulsan National Institute of Science and Technology) [1.160033.01]
- Stanford GCEP
To date, most studies have focused only on the interaction between oxygen and the catalyst, with the intention of minimizing the mass-transfer resistance by using the rotating disk electrode (RDE) method, which is based on the forced-convection theory. To begin with, in order to increase the reaction rate, the oxygen should be able to reach the active sites of the catalyst readily (mass transfer). Next, a moderate (i.e., not too strong or weak) interaction (kinetics) should be maintained between the oxygen molecules and the catalyst, in order to allow for better adsorption and desorption. Therefore, these two factors should be taken into consideration when designing electrocatalysts for oxygen reduction. Further, there is bound to be a demand for large-scale metal-air batteries in the future. With these goals in mind, in this study, a facile and scalable method is developed for fabricating metal-air batteries based on the fact that the Prussian blue analogue Mn-3[Co(CN)(6)](2)center dot nH(2)O and gelatin-coated Ketjenblack carbon thermally decompose at 400 degrees C in air (i.e., without requiring high-temperature pyrolysis under inert conditions) to form porous spinel oxides and N-doped carbon materials. The intrinsic kinetics characteristics and the overall performance of the resulting catalysts are evaluated using the RDE method and a Zn-air full cell, respectively.
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