The polymorphic change of TiO2 nanofiber catalysts from anatase to rutile enabled Li–O2 cells to have higher round-trip efficiency and lower overpotential followed by a better cyclic retention. This is due to enhanced catalytic activity probably associated with the smaller Li+ chemisorption energy and band gap of the rutile phase compared with the anatase phase.
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Kang et al. (2014) studied this question.
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