Phosphate Ion Functionalized Co<sub>3</sub> O<sub>4</sub> Ultrathin Nanosheets with Greatly Improved Surface Reactivity for High Performance Pseudocapacitors.

Zhai, Teng; Wan, Liming; Sun, Shuo; Chen, Qi; Sun, Jiao; Xia, Qiuying; Xia, Hui · Adv Mater · 2017

basic_science · Level V

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Abstract

A surface-modified Co<sub>3</sub> O<sub>4</sub> ultrathin nanosheet (denoted as PCO) is reported via controllable phosphate ion functionalization for pseudocapacitors. An energy density of 71.6 W h kg<sup>-1</sup> (at 1500 W kg<sup>-1</sup> ) is achieved by the PCO-based pseudocapacitor. The unique porous nanosheet morphology, high surface reactivity, and fast electrode kinetics of PCO are found to be responsible for the enhanced pseudocapacitive performance.