Rich oxygen vacancy and amorphous/crystalline ruthenium-doped CoCu -layered double hydroxide electrocatalysts for enhanced oxygen evolution reactions

• Published in: Journal of colloid and interface science Vol. 671; pp. 283 - 293
• Main Authors: Wang, Yanan, Jing, Li, Jiang, Wei, Wu, Yuanyuan, Liu, Bo, Sun, Yantao, Chu, Xianyu, Liu, Chunbo
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.10.2024
• Subjects: Crystalline/amorphous heterointerface; Layered double hydroxides; Oxygen evolution reaction(OER); Oxygen vacancy; Oxygen evolution reaction(OER); Crystalline/amorphous heterointerface; Layered double hydroxides; Oxygen vacancy
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2024.05.169

The oxygen-rich vacancies and crystalline/amorphous Ru doping CoCu+Ru10-LDH/NF were successfully synthesized using MOF as precursor and template. The combination of heteroatom doping, interface engineering, and defect engineering can significantly improve the conductivity, intrinsic activity, and active site utilization of the catalyst to achieve efficient OER performance. This design concept presented in this paper provides a new way to develop high performance OER electrocatalysts. [Display omitted] Reinforcing the development of efficient and robust electrocatalysts is pivotal in addressing the challenges associated with oxygen evolution reactions (OER) in water splitting technology. Here, an amorphous/crystalline low-ruthenium-doped bimetallic layered double hydroxide (LDH) electrocatalyst (a/c-CoCu + Rux-LDH/NF) with massive oxygen vacancy on nickel foam was fabricated via ion-exchange and chemical etching, facilitating efficient OER. Among the various catalyst materials tested, the a/c-CoCu + Ru10-LDH/NF exhibits remarkable performance in the OER when employed in an alkaline electrolyte containing 1 M KOH. Achieving a minimal overpotential at 10 mA cm−2 of 214 mV, exhibiting a low Tafel slope value of 64.3 mV dec−1 and exceptional durability lasting for over 100 h. Theoretical calculations demonstrate that the electron structure and d-band center of CoCu-LDH can be effectively regulated through the utilization of a strategy possessing abundant oxygen vacancies and a Ru-doped crystalline/amorphous heterostructure. It will lead to optimized adsorption free energy of reactants and reduced energy barriers for OER. The construction strategy proposed in this paper for catalysts with amorphous/crystalline heterointerfaces offer a novel opportunity to achieve highly efficient OER.