Hollow Hydrangea‐Like CoRu/Co Architecture as an Excellent Electrocatalyst for Oxygen Evolution

Abstract

Developing low‐cost but efficient electrocatalysts to promote the sluggish kinetics of oxygen evolution from water splitting is essential for hydrogen production. In this study, a hierarchical hollow hydrangea‐like CoRu/Co superstructure is constructed through a self‐templating method by morphology‐controlled pyrolysis of flower‐like Ru‐doped Co‐based layered double hydroxides (LDH). The anchoring of Ru into Co−LDH is the key to the formation of well‐defined hydrangea‐like three‐dimensional superstructure composed of CoRu/Co. The optimized CoRu/Co−M‐350 with a low Ru loading of 3.0 wt% exhibits excellent catalytic performances in the oxygen evolution reaction (OER) with low overpotential (η10=192 mV) and excellent stability for 100 h at 100 mA cm−2 in alkaline media, outperforming the benchmark RuO2 and most reported electrocatalysts. The superior morphology and structural features of CoRu/Co−M‐350 provide not only abundant accessible surface sites but also fast mass and electron transfer, thereby promoting OER catalysis. The present study provides a new synthetic route for preparing highly active OER electrocatalysts.

Highly dispersed RuCo clusters on N-doped carbon shell for Li–O2/CO2batteries and exploitation of the synergistic effect of O2and CO2

“…Due to the excellent catalytic performance of the RuCo alloy, it is often used in the oxygen reduction reaction, oxygen evolution reaction, and other electrocatalytic reactions. [47][48][49][50] To solve the above problems, carbon nanostructures with RuCo nanoclusters were introduced into Li-O 2 /CO 2 batteries as cathode materials on account of their excellent electrical conductivity, large surface area, and high electrochemical stability. Besides, it also provides efficient diffusion channels for O 2 /CO 2 , enough space for product storage, and active sites for electrochemical reactions.…”

Recent advances in hollow nanomaterials with multiple dimensions for electrocatalytic water splitting

“…[37][38][39] The self-template method is used to directly synthesize hollow structures without additional templates. 40,41 With the development of nanotechnology, the distinctions between these three methods are still unclear, and the three methods can be used individually or simultaneously. Many predecessors have made important discussions on the structural design, synthesis method, application and detection of hollow materials.…”