Nanoporous molybdenum carbide wires as an active electrocatalyst towards the oxygen reduction reaction

Abstract

A non-precious metal electrocatalyst has been developed for the oxygen reduction reaction based on nanoporous molybdenum carbide (nano-Mo₂C) wires through a facile calcination of sub-nanometer periodic organic–inorganic hybrid nanowires. The highly dispersed Mo₂C wires were composed of 10–15 nm nanocrystals with a mesopore size of 3.3 nm. The properties of nano-Mo₂C wires were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction and N₂ adsorption/desorption porosimetry. The highly active surface area and enriched nanoporosity for nano-Mo₂C wires are unique features that make them a high-performance electrocatalyst for oxygen reduction in an alkaline medium. The electrocatalysis and reaction kinetics results show that nano-Mo₂C-based materials can be developed as new catalysts with high activity at low cost for electrochemical energy conversion applications.