Role of LiCoO2 Surface Terminations in Oxygen Reduction and Evolution Kinetics.

نویسندگان

  • Binghong Han
  • Danna Qian
  • Marcel Risch
  • Hailong Chen
  • Miaofang Chi
  • Ying Shirley Meng
  • Yang Shao-Horn
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.

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عنوان ژورنال:
  • The journal of physical chemistry letters

دوره 6 8  شماره 

صفحات  -

تاریخ انتشار 2015