期刊
ACS NANO
卷 11, 期 11, 页码 11594-11601出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b06595
关键词
cation ordered perovskite; bifunctional electrocatalyst; nanofiber; rechargeable zinc-air battery
类别
资金
- Mid-Career Researcher Program through National Research Foundation of Korea [NRF-2015R1A2A1A10055886]
- Ministry of Science, ICT and Future Planning
- Research Fund of UNIST [1.170002.01]
- National Natural Science Foundation of China [21706132]
- Ministry of Science & ICT (MSIT), Republic of Korea [2017BRAND] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015R1A2A1A10055886] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Of the various catalysts that have been developed to date for high performance and low cost, perovskite oxides have attracted attention due to their inherent catalytic activity as well as structural flexibility. In particular, high amounts of Pr substitution of the cation ordered perovskite oxide originating from the state-of-the-art Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) electrode could be a good electrode or catalyst because of its high oxygen kinetics, electrical conductivity, oxygen capacity, and structural stability. However, even though it has many favorable intrinsic properties, the conventional high-temperature treatment for perovskite synthesis, such as solid-state reaction and combustion process, leads to the particle size increase which gives rise to the decrease in surface area and the mass activity. Therefore, we prepared mesoporous nanofibers of various cation-ordered PrBa0.5Sr0.5Co2-xFexO5+delta = 0, 0.5, 1, 1.5, and 2) perovskites via electrospinning. The well-controlled B-site metal ratio and large surface area (similar to 20 m(2) g(-1)) of mesoporous nanofiber result in high performance of the oxygen reduction reaction and oxygen evolution reaction and stability in zinc-air battery.
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