Abstract

Carbon nanotubes are important support materials for electrocatalysts in fuel cells. In this chapter, non-Pt catalysts supported on carbon nanotubes for oxygen reduction reaction or bifunctional oxygen electrodes are summarized. According to the kinds of catalysts and the pretreatments of the carbon nanotubes, the catalysts are divided into five categories: M-N4 catalysts supported on pristine carbon nanotubes, M-N4 catalysts supported on functionalized carbon nanotubes, transition metal oxides and phosphides supported on oxidized carbon nanotubes, transition metal oxides and phosphides supported on polymer-functionalized carbon nanotubes, and N-doped carbon nanotubes. The corresponding preparation methods, microstructures, and electrocatalytic activities are summarized.

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