Metal oxides/CNT nano-composite catalysts for oxygen reduction/oxygen evolution in alkaline media

被引:165
作者
Andersen, Nalin I. [1 ]
Serov, Alexey [1 ]
Atanassov, Plamen [1 ]
机构
[1] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA
关键词
Oxygen reduction catalyst; Oxygen evolution catalyst; Non-platinum group catalyst; Environmental catalysts; Functionalized carbon nanotubes; CARBON NANOTUBES; AIR BATTERIES; FUEL-CELLS; ELECTROOXIDATION; ELECTROCATALYSTS; PLATINUM; IRON; GLYCEROL; ALLOY;
D O I
10.1016/j.apcatb.2014.08.033
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A series of highly active state-of-the-art catalysts have been synthesized by depositing high loadings of transition metal oxides (MnO2, Co3O4, NiO, CuO and FexOy) onto nitrogen-doped carbon nanotubes (CNTs) for hi-functional catalysis in alkaline media. The metal oxides have been dispersed onto functionalized CNTs by an improved impregnation method. This novel, synthetic approach allows for both the preparation of functionalized nitrogen-doped CNTs as well as the even dispersion of metal oxides onto the walls of the CNTs. The catalysts have been characterized by Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), transition electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) methods. Catalytic activity has been measured using a Rotating Disc Electrode (RDE) experiment. The resulting catalysts are stable in alkaline media under experimental conditions and have high hi-functional electrocatalytic activity-both for the oxygen reduction reactions (ORR) and oxygen evolution reactions (OER), From this series of catalysts, the most active catalyst for ORR is the 50 wt% MnO2/CNT catalyst with a half-wave potential of 0.84V at the current density of -2.1 mA cm(-2) and an onset at 0.98V versus RHE. The most active for OER is the 50 wt% NiO/CNT catalyst with an onset potential at 1.45 V versus RHE. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:623 / 627
页数:5
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