CeOx-Decorated Hierarchical NiCo2S4 Hollow Nanotubes Arrays for Enhanced Oxygen Evolution Reaction Electrocatalysis

摘要

Developing hollow self-supported nanotube arrays with hierarchical microporous and abundant multiactive sites shows great promise for oxygen evolution reaction (OER) electrocatalysis. Herein, a facile and low-cost strategy of NiCo_(2)S_(4) hollow nanotubes arrays decorated with CeO_(x) nanoparticles (NPs) assembled on a flexible support carbon cloth (CC) for enhanced OER performance is reported. The obtained hierarchical nanoarrays CeO_(x) /NiCo_(2)S_(4)/CC exhibited excellent activity toward OER with an overpotential (270 mV) at 10 mA cm~(–2), relatively weak Tafel slope, and distinguished durability. CeO_(x) /NiCo_(2)S_(4)/CC nanoarrays not only provide fast electronic transmission and well-defined connection to the substrate but also defective sites and electron transfer by the introduction of CeO_(x) NPs. This new strategy was offered to construct low-cost and effectively hierarchical structural electrocatalysts containing rare-earth species.