AUTHOR=Jiang Zi-Min , Xu Ting-Ting , Yan Cong-Cong , Ma Cai-Yun , Dai Shu-Ge 

TITLE=Urchin-Like Ni2/3Co1/3(CO3)1/2(OH)·0.11H2O for High-Performance Supercapacitors

JOURNAL=Frontiers in Chemistry

VOLUME=6

YEAR=2018

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00431

DOI=10.3389/fchem.2018.00431

ISSN=2296-2646

ABSTRACT=<p>Here, we report our finding in the fabrication of novel porous urchin-like Ni<sub>2/3</sub>Co<sub>1/3</sub>(CO<sub>3</sub>)<sub>1/2</sub>(OH)·0. 11H<sub>2</sub>O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g<sup>−1</sup> at a current density of 1 A g<sup>−1</sup>. Moreover, an architectural composite electrode consisting of the porous NC nanoneedles wrapped by reduced graphene oxide (rGO) nanosheets exhibits large specific capacity (431 C g<sup>−1</sup> at 1 A g<sup>−1</sup>), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g<sup>−1</sup>). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.</p>