Soluble Supercapacitors: Large and Reversible Charge Storage in Colloidal Iron-Doped ZnO Nanocrystals
By Brozek, Carl K.; Zhou, Dongming; Liu, Hongbin; Li, Xiaosong; Kittilstved, Kevin R.; Gamelin, Daniel R.
Published in Nano Letters
2018
Abstract
Colloidal ZnO semiconductor nanocrystals have previously been shown to accumulate multiple delocalized conduction-band electrons under chemical, electrochemical, or photochemical reducing conditions, leading to emergent semimetallic characteristics such as quantum plasmon resonances and raising prospects for application in multielectron redox transformations. Here, we demonstrate a dramatic enhancement in the capacitance of colloidal ZnO nanocrystals through aliovalent Fe3+-doping. Very high areal and volumetric capacitances (33 ?F cm
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