Preparation of Ni2P nanochains with controllable geometry for the hydrogen evolution reaction by application of a high magnetic field. (October 2022)

• Record Type: Journal Article
• Authors: Wang, Zhong; Yuan, Shuang; Liu, Jiaqi; Zhang, Yin; Liu, Chen; Liu, Tie; Wang, Qiang
• Is Part Of: Scripta materialia. Number 219(2022)
• Publication Date: 2022-10
• Subjects: Magnetic field -- Modulation -- Nanochains -- Hydrogen evolution reaction; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114892
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In this work, a new method for controlling the morphology of Ni2 P materials by using a high magnetic field (HMF) was proposed. In HMF, the Ni2 P nanoparticles become smaller and self-assemble into one-dimensional nanochain. The nucleation, growth, and assembly mechanism of Ni2 P in HMF was revealed. Thermodynamic calculations show that the magnetic Gibbs free energy of the reaction process increases by 219 kJ mol −1 in 6T HMF and the saturation magnetization of Ni2 P is 12 times higher than without HMF. In addition, the obtained Ni2 P nanochains exhibit better electrocatalytic activity than Ni2 P nanoparticle, the overpotential of Ni2 P nanochain was 231 mV lower than that of Ni2 P particles (200 mA cm −2 ). The theoretical and experimental results both indicate that magnetic field can control material structure and properties effectively. Graphical abstract: 1D nanochain structures Ni2 P was obtained by manipulating the magnetic field first time. Compared with Ni2P obtained without applying magnetic field, the HER activity of Ni2 P nanochain was enhanced obviously, and the action mechanism of magnetic field is revealed quantitatively. Image, graphical abstract