Transition-metal oxide and phosphate materials, commonly used for lithium battery devices, are active as oxygen evolution reaction (OER) catalysts under alkaline and neutral solution conditions. Electrodes composed of LiCoO 2 and LiCoPO 4 exhibit progressive deactivation and activation for OER catalysis, respectively, upon potential cycling at neutral pH. The deactivation of LiCoO 2 and activation of LiCoPO 4 are coincident with changes in surface morphology and composition giving rise to spinel-like and amorphous surface structures, respectively. The amorphous surface structure of the activated LiCoPO 4 is compositionally similar to that obtained from the electrodeposition of cobalt oxide materials from phosphate-buffered electrolyte solutions. These results highlight the importance of a combined structural and electrochemical analysis of the materials surface when assessing the true nature of the OER catalyst. © 2012 American Chemical Society.
CITATION STYLE
Lee, S. W., Carlton, C., Risch, M., Surendranath, Y., Chen, S., Furutsuki, S., … Shao-Horn, Y. (2012). The nature of lithium battery materials under oxygen evolution reaction conditions. Journal of the American Chemical Society, 134(41), 16959–16962. https://doi.org/10.1021/ja307814j
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