Negatively Charged Hydrophobic Carbon Nano ‐Onion Interfacial Layer Enabling High‐Rate and Ultralong‐Life Zn‐Based Energy Storage

A negatively charged hydrophobic carbon nano-onion (CNO) interfacial layer to realize ultrastable and high-rate Zn anodes is reported, enabling high-performance Zn-based electrochemical energy storage. Its hydrophobicity blocks active water and reduces the Zn2+ desolvation barrier, and the negatively charged CNOs adsorb Zn2+ and repel SO42 − to homogenize Zn2+ flux, accelerate Zn2+ desolvation and suppress the self-corrosion of Zn anodes. AbstractZn-based electrochemical energy storage (EES) systems are attracting more attention, whereas their large-scale application is restricted by the dendrite and parasitic reaction-caused unstable Zn anodes. Herein, a negatively charged hydrophobic carbon nano-onion (CNO) interfacial layer is proposed to realize ultrastable and high-rate Zn anodes, enabling high-performance Zn-based EES. For the CNO interfacial layer, its hydrophobicity not only blocks active water but also reduces the Zn2+ desolvation barrier, and meanwhile, the negatively-charged CNO nanoparticles adsorb Zn2+ and repel SO42 − to homogenize Zn2+ flux, accelerate Zn2+ desolvation and suppress the self-corrosion of Zn anodes. Besides, the conductive CNO interfacial layer increases the surface area for the Zn deposition to reduce local current density. Consequently, under the modulation of the CNO interfacial layer, Zn plating/stripping exhibits impressive reversibility with an average Coulombic efficiency of 99.4% over 800 cycles, and Zn anodes present significantly en...
Source: Small - Category: Nanotechnology Authors: Tags: Research Article Source Type: research