Structure-controlled Co-Al layered double hydroxides/reduced graphene oxide nanomaterials based on solid-phase exfoliation technique for supercapacitors

Jiapeng Li; Ping Zhang; Xiuli Zhao; Lin Chen; Jia Shen; Mengting Li; Bingqiang Ji; Lixian Song; Yeping Wu; Dong Liu

doi:10.1016/j.jcis.2019.04.062

Structure-controlled Co-Al layered double hydroxides/reduced graphene oxide nanomaterials based on solid-phase exfoliation technique for supercapacitors

J Colloid Interface Sci. 2019 Aug 1:549:236-245. doi: 10.1016/j.jcis.2019.04.062. Epub 2019 Apr 19.

Authors

Jiapeng Li¹, Ping Zhang², Xiuli Zhao³, Lin Chen¹, Jia Shen¹, Mengting Li¹, Bingqiang Ji¹, Lixian Song¹, Yeping Wu³, Dong Liu⁴

Affiliations

¹ State Key Laboratory of Environment-friendly Energy Materials & School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China.
² State Key Laboratory of Environment-friendly Energy Materials & School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China. Electronic address: zpdcy724@mail.ustc.edu.cn.
³ Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China.
⁴ State Key Laboratory of Environment-friendly Energy Materials & School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China. Electronic address: dtld123@126.com.

PMID: 31055224
DOI: 10.1016/j.jcis.2019.04.062

Abstract

High-efficient nanosheets exfoliation and ordered controlled stacking are in urgent need of work for electrochemistry application. Here, we have developed a high-efficient and environmentally-friendly solid-phase method for the exfoliation of Co-Al layered double hydroxide (Co-Al LDH) and graphene oxide (GO). Meanwhile, we found that there is a dynamic structure evolution in the self-assembly process between Co-Al LDH-NS and GO-NS and new theoretical structure models were proposed. With the reduction treatment, the electrochemical test results show that Co-Al LDH/rGO-3 with ideal tiling structure has better electrochemical performance, which provides a specific capacitance of 1492 F g^-1 at 1 A g^-1 and remains the capacitance retention at approximately 94.3% after 5000 cycles. Moreover, an energy density of 44.6 Wh kg^-1 is obtained at a power density of 799.6 W kg^-1. The proposed method and the structure-relationship are practically applicable for other 2D materials in the asymmetric supercapacitors.

Keywords: Controllable stacking; Exfoliated; Graphene oxide; Layered double hydroxides; Supercapacitor.