One-dimensional cobalt oxide nanotubes with rich defect for oxygen evolution reaction.

For the electrochemcial hydrogen production, the oxygen evolution reaction (OER) is a pivotal half-reaction in water splitting. However, OER suffers sluggish kinetics and high overpotential, leading to the increase of overall energy consumption and decrease of the energy efficiency. In this work, high-quality cobalt oxide porous nanotubes (CoO-PNTs) are easily obtained by simple self-template approach.