Designable synthesis of reactive deep eutectic solvents (RDESs) in regulating Ni-based materials for an efficient oxygen evolution reaction. Issue 20 (22nd September 2022)

• Record Type: Journal Article
• Authors: Wei, Yahui; Jiang, Jingyun; Dong, Jialong; Xu, Yifan; Fu, Jianwei; Xu, Qun
• Is Part Of: Green chemistry. Volume 24:Issue 20(2022)
• Page Start: 8014
• Page End: 8020
• Publication Date: 2022-09-22
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/d2gc02958h
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : Reactive deep eutectic solvents (RDESs) were proposed and used for regulating Ni-based oxygen evolution reaction electrocatalysts. Abstract : Deep eutectic solvents (DESs) are burgeoning green solvents in materials chemistry; however, a lack of multifunctionality is a typical limitation for most reported DESs. Herein, we describe 8 task-specific reactive DESs (RDESs) composed of amino acids and nickel chloride hexahydrate (NiCl2 ·6H2 O) that support the desired reactive function for fabricating Ni-based materials, preserving the cost-effectiveness and energy-efficiency properties of the one-step annealing process. The structure of amino acids in the hydrogen bonded network was studied by Fourier transform infrared spectroscopy (FT-IR). Then, the effects of chain length, functional group substitution and molar ratios on the thermodynamic stability of DESs were also explored. Finally, taking serine–NiCl2 ·6H2 O and threonine–NiCl2 ·6H2 O systems as examples, which were equipped with or without a methyl group, Ni and Ni@Ni(OH)2 samples were prepared by a one-step annealing process, respectively. Notably, the obtained Ni@Ni(OH)2 materials exhibited considerable oxygen evolution reaction (OER) performance in an alkaline environment. Therefore, our proposed RDESs with versatile types and functionalities will open new avenues for potential development in energy and environmental applications.