In Situ Synthesis of Ternary NiCoRu-Based Layered Double Hydroxide by Chlorine Corrosion toward Electrocatalytic Water Oxidation

• Published in: ACS sustainable chemistry & engineering 2019-09, Vol.7 (17), p.14361-14367
• Main Authors: Hao, Shaoyun, Zheng, Guokui, Gao, Shaojie, Qiu, Lingshu, Xu, Nan, He, Yi, Lei, Lecheng, Zhang, Xingwang
• Format: Article
• Language: English
• ISSN: 2168-0485; 2168-0485
• DOI: 10.1021/acssuschemeng.9b03830

Discovering the multimetallic electrocatalyts with more active sites, superstability, and higher active areas toward oxygen evolution reaction (OER) is highly urgent for energy reserves. Herein, this work puts forward a novel ternary NiCoRu-layered double hydroxide (NiCoRu-LDH) synthesized via a facile one-step chloride (Cl–) corrosion for Ni foam (NF) in the situ process as an excellent electrocatalyst toward OER. The introduction of Ru cations prominently altered the electronic properties of NiCo-LDH, exposing more surface active sites, and optimizing the intermediates of adsorption oxygen (OOH*) for water oxidation. As expected, the obtained trimetallic NiCoRu-LDH/NF electrode revealed a fairly low overpotential toward OER (270 mV at 100 mA·cm–2) with a Tafel slope of 40 mV·dec–1 and prolonged stability (55 h at 100 mA·cm–2) in alkaline solution, outperforming most of the hydroxide-based electrocatalysts currently reported. Our work demonstrates an effective approach to designing the highly efficient multimetallic electrodes toward OER.