Transition metal oxide as anode interface buffer for impedance spectroscopy Hui Xu, Chao Tang, Xu-Liang Wang, Wen-Juan Zhai, Rui-Lan Liu, Zhou Rong, Zong-Qiang Pang, Bing Jiang, Qu-Li Fan and Wei Huang Eur. Phys. J. Appl. Phys., 72 3 (2015) 30201 Published online: 18 December 2015 DOI: 10.1051/epjap/2015150305