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.
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Wu et al. (2019) studied this question.
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