Rational Design of a Two-Dimensional Janus CuFeO2+δ Single Layer as a Photocatalyst and Photoelectrode
journal contributionposted on 2021-11-03, 14:13 authored by Zong-Yan Zhao, Qing-Lu Liu
The exfoliation of 2D nanomaterials from 3D multimetal oxides with a stable structure is a great challenge. Herein, a delafossite CuFeO2+δ nanosheet becomes an open-layered structure by introducing excess oxygen so that the 2D Janus CuFeO2+δ single layer can be further obtained by aqueous ultrasonic exfoliation. The 2D Janus CuFeO2+δ single layer breaks the limitation of mirror symmetry, which is very beneficial to the effective separation of photogenerated electron–hole pairs. Serving as both a photoelectrode and a photocatalyst, the 2D Janus CuFeO2+δ single layer/few layer remarkably enhances the photocatalytic activity with long-term stability: the photocurrent density is increased by 2-fold, and the rate of H2 evolution is increased by 1.5-fold, in comparison with the counterpart of unexfoliated CuFeO2+δ nanosheets. This work demonstrates that 2D nanomaterials can be directly exfoliated from 3D nanomaterials by rational composition and microstructure design, which is helpful in promoting the development of bimetallic-oxide-ene (BMOene) as a novel functional material.
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novel functional materialintroducing excess oxygenlayer remarkably enhancesdimensional janus cufeo3d multimetal oxidesδ </ subsingle layer breaksaqueous ultrasonic exfoliation2d janus cufeo2 </ subsingle layerunexfoliated cufeodelafossite cufeo3d nanomaterials2d nanomaterialswork demonstratesterm stabilitystable structurerational designrational compositionphotocurrent densityphotocatalytic activitynanosheet becomesmirror symmetrymicrostructure designlayered structuregreat challengeeffective separationdirectly exfoliated