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

Zi-Min Jiang; Ting-Ting Xu; Cong-Cong Yan; Cai-Yun Ma; Shu-Ge Dai

doi:10.3389/fchem.2018.00431

Urchin-Like Ni_2/3Co_1/3(CO₃)_1/2(OH)·0.11H₂O for High-Performance Supercapacitors

Front Chem. 2018 Sep 28:6:431. doi: 10.3389/fchem.2018.00431. eCollection 2018.

Authors

Zi-Min Jiang¹, Ting-Ting Xu¹, Cong-Cong Yan¹, Cai-Yun Ma¹, Shu-Ge Dai¹

Affiliation

¹ Key Laboratory of Material Physics of Ministry of Education, Zhengzhou University, Zhengzhou, China.

Abstract

Here, we report our finding in the fabrication of novel porous urchin-like Ni_2/3Co_1/3(CO₃)_1/2(OH)·0. 11H₂O (denoted as NC) nanomaterial composed of numerous nanoneedles through an one-step hydrothermal method, which deliveres a high specific capacity of 318 C g^-1 at a current density of 1 A g^-1. 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^-1 at 1 A g^-1), high rate capability and long cycling life (94% capacity retention after 5,000 cycles at 20 A g^-1). The presence of rGO in the composite electrode greatly improves the electronic conductivity, providing efficient current collection for fast energy storage.

Keywords: NiCo hydroxides; composites; graphene; porous; supercapacitors.