2D Ferromagnetic M<sub>3</sub>GeTe<sub>2</sub> (M = Ni/Fe) for Boosting Intermediates Adsorption toward Faster Water Oxidation
Guyue Bo, Peng Li, Yameng Fan, Xiaobo Zheng, Mengting Zhao, Qiang Zhu, Yang Fu, Yitong Li, Wei Kong Pang, Wei Hong Lai, Bernt Johannessen, Lars Thomsen, Bruce C. C. Cowie, Tianyi Ma, Cheng Wang, Guan Heng Yeoh, Yi Du, Shi Xue Dou, Xun Xu
Abstract
Abstract In this work, 2D ferromagnetic M 3 GeTe 2 (MGT, M = Ni/Fe) nanosheets with rich atomic Te vacancies (2D‐MGT v ) are demonstrated as efficient OER electrocatalyst via a general mechanical exfoliation strategy. X‐ray absorption spectra (XAS) and scanning transmission electron microscope (STEM) results validate the dominant presence of metal‐O moieties and rich Te vacancies, respectively. The formed Te vacancies are active for the adsorption of OH* and O* species while the metal‐O moieties promote the O* and OOH* adsorption, contributing synergistically to the faster oxygen evolution kinetics. Consequently, 2D‐Ni 3 GeTe 2v exhibits superior OER activity with only 370 mV overpotential to reach the current density of 100 mA cm −2 and turnover frequency (TOF) value of 101.6 s −1 at the overpotential of 200 mV in alkaline media. Furthermore, a 2D‐Ni 3 GeTe 2v ‐based anion‐exchange membrane (AEM) water electrolysis cell (1 cm 2 ) delivers a current density of 1.02 and 1.32 A cm −2 at the voltage of 3 V feeding with 0.1 and 1 m KOH solution, respectively. The demonstrated metal‐O coordination with abundant atomic vacancies for ferromagnetic M 3 GeTe 2 and the easily extended preparation strategy would enlighten the rational design and fabrication of other ferromagnetic materials for wider electrocatalytic applications.