title: Facile construction of manganese oxide doped carbon nanotube catalysts with high activity for oxygen reduction reaction and investigations into the origin of their activity enhancement.
abstract: MnOx-doped carbon nanotube (MnOx-CNTs) catalysts for the oxygen reduction reaction (ORR) were fabricated using a simple electrochemical deposition method. MnOx-CNTs (0.85 wt % MnOx) could exhibit an improved electrocatalytic activity, long-term stability and excellent resistance to crossover-effect compared to Pt/C catalysts. High-resolution transmission electron microscopy (HRTEM) and X-ray diffraction analysis confirm that the MnOx in the MnOx-CNTs exists in an amorphous state. Moreover, compared to the catalytic performances of MnOx on other substrates, the MnOx-CNTs exhibit a high ORR activity. X-ray photoelectron spectroscopy results suggest that the electron transfer, from the CNTs to the Mn ions occurs and the high positive charge is generated on the MnOx-CNT surface. This is believed to be origin of the catalytic activity observed in the ORR using MnOx-CNTs.
authors.affiliation: Nanomaterials and Chemistry Key Laboratory, Wenzhou University, Wenzhou 325027, China. yang201079@126.com
authors.forename: Zhi
authors.initials: Z
authors.lastname: Yang
authors.forename: Xuemei
authors.initials: X
authors.lastname: Zhou
authors.forename: Huagui
authors.initials: H
authors.lastname: Nie
authors.forename: Zhen
authors.initials: Z
authors.lastname: Yao
authors.forename: Shaoming
authors.initials: S
authors.lastname: Huang