Field-Free Improvement of Oxygen Evolution Reaction in Magnetic Two-Dimensional Heterostructures.
basic_science · Level V
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- Record sourced from PubMed, PMID 34859672.
- Also identified by DOI 10.1021/acs.nanolett.1c03981.
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Abstract
Ferromagnetic (FM) electrocatalysts have been demonstrated to reduce the kinetic barrier of oxygen evolution reaction (OER) by spin-dependent kinetics and thus enhance the efficiency fundamentally. Accordingly, FM two-dimensional (2D) materials with unique physicochemical properties are expected to be promising oxygen-evolution catalysts; however, related research is yet to be reported due to their air-instabilities and low Curie temperatures (<i>T</i><sub>C</sub>). Here, based on the synthesis of 2D air-stable FM Cr<sub>2</sub>Te<sub>3</sub> nanosheets with a low <i>T</i><sub>C</sub> around 200 K, room-temperature ferromagnetism is achieved in Cr<sub>2</sub>Te<sub>3</sub> by proximity to an antiferromagnetic (AFM) CrOOH, demonstrating the accomplishment of long-ranged FM ordering in Cr<sub>2</sub>Te<sub>3</sub> because the magnetic proximity effect stems from paramagnetic (PM)/AFM heterostructure. Therefore, the OER performance can be permanently promoted (without applied magnetic field due to nonvolatile nature of spin) after magnetization. This work demonstrates that a representative PM/AFM 2D heterostructure, Cr<sub>2</sub>Te<sub>3</sub>/CrOOH, is expected to be a high-efficient magnetic heterostructure catalysts for oxygen-evolution.