Fig. 3From: Enhancement of Electrochemical Performance by the Oxygen Vacancies in Hematite as Anode Material for Lithium-Ion Batteries a The wide-survey, b Fe 2p, and c O 1s XPS spectra of Fe2O3−δ. d EPR spectra of Fe2O3−δ collected at 90 K, where H is the magnetic fieldBack to article page