Construction of Ultra-Stable Ultrathin Black Phosphorus Nanodisks Hybridized with Fe3 O4 Nanoclusters and Iron (V)-Oxo Complex for Efficient Potassium Storage.

Abstract

The practical application of metalloid black phosphorus (BP) based anodes for potassium ion batteries (PIBs) is mainly impeded by its instability in air and irreversible/sluggish potassium -storage behaviors. Herein, w e purposefully conceptualize a two-dimensional composite, where ultrathin BP nanodisks with Fe3 O4 nanoclusters are hybridized with Lewis acid iron (V)-oxo complex (FC) nanosheets (denoted as BP@Fe3 O4 -NCs@FC). The introduced electron coordinate bridge between FC and BP, and hydrophobic surface of FC synergistically assure that BP@Fe3 O4 -NCs@FC is ultra-stable in humid air. With the purposeful structural and componential design, the resultant BP@Fe3 O4 -NCs@FC anode is endowed with appealing electrochemical performance in terms of reversible capacity, rate behavior and long-duration cycling stability in both half and full cells. Furthermore, the underlying formation and potassium-storage mechanisms of BP@Fe3 O4 -NCs@FC w ere tentatively proposed. The in-depth insights here will provide a crucial understanding in rational exploration of advanced anodes for next-generation PIBs. This article is protected by copyright. All rights reserved.