Role of LiCoO2 Surface Terminations in Oxygen Reduction and Evolution Kinetics.
نویسندگان
چکیده
Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities of LiCoO2 nanorods with sizes in the range from 9 to 40 nm were studied in alkaline solution. The sides of these nanorods were terminated with low-index surfaces such as (003), while the tips were terminated largely with high-index surfaces such as (104), as revealed by high-resolution transmission electron microscopy. Electron energy loss spectroscopy demonstrated that low-spin Co(3+) prevailed on the sides, while the tips exhibited predominantly high- or intermediate-spin Co(3+). We correlated the electronic and atomic structure to higher specific ORR and OER activities at the tips as compared to the sides, which was accompanied by more facile redox of Co(2+/3+) and higher charge transferred per unit area. These findings highlight the critical role of surface terminations and electronic structures of transition-metal oxides on the ORR and OER activity.
منابع مشابه
42 4 SURFACE SPIN TRANSITION IN NANO-SIZE STOICHIOMETRIC LiCoO2 AND ITS APPLICATIONS IN OXYGEN EVOLUTION REACTION / OXYGEN REDUCTION REACTION (OER/ORR) CATALYTIC PROCESS 4.1 Electronic Spin Transition in Nano-size Stoichiometric Lithium Cobalt Oxide
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ورودعنوان ژورنال:
- The journal of physical chemistry letters
دوره 6 8 شماره
صفحات -
تاریخ انتشار 2015