Highly stable zinc metal anode enabled by oxygen functional groups for advanced Zn-ion supercapacitors

Abstract

Konjac glucomannan (KGM) featuring abundant oxygen functional groups has been elaborately designed to enhance Zn reversibility. Importantly, –OH and CO groups as active sites could redistribute the Zn²⁺ concentration field and modulate the plating/stripping rate, further enabling uniform Zn deposition without dendrite growth. The Zn@KGM anode enables an advanced Zn-ion supercapacitor to deliver an impressive rate performance and cycling stability (up to 5000 cycles accompanied by a coulombic efficiency of 99.8%).