Two-Dimensional Transition Metal Oxide and Hydroxide-Based Hierarchical Architectures for Advanced Supercapacitor Materials

Meili Guan; Qiuwan Wang; Xuan Zhang; Jian Bao; Xuezhong Gong; Youwen Liu

doi:10.3389/fchem.2020.00390

Two-Dimensional Transition Metal Oxide and Hydroxide-Based Hierarchical Architectures for Advanced Supercapacitor Materials

Front Chem. 2020 May 15:8:390. doi: 10.3389/fchem.2020.00390. eCollection 2020.

Authors

Meili Guan¹, Qiuwan Wang¹, Xuan Zhang¹, Jian Bao¹, Xuezhong Gong², Youwen Liu³

Affiliations

¹ Institute for Energy Research, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
² National Center of International Joint Research for Hybrid Materials Technology, National Base of International Science and Technology Cooperation on Hybrid Materials, College of Materials Science and Engineering, Institute of Hybrid Materials, Qingdao University, Qingdao, China.
³ State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China.

Abstract

The supercapacitor has been widely seen as one of the most promising emerging energy storage devices, by which electricity is converted from chemical energy and stored. Two-dimensional (2D) metal oxides/hydroxides (TMOs/TMHs) are revolutionizing the design of high-performance supercapacitors because of their high theoretical specific capacitance, abundance of electrochemically active sites, and feasibility for assembly in hierarchical structures by integrating with graphitic carbon, conductive polymers, and so on. The hierarchical structures achieved can not only overcome the limitations of using a single material but also bring new breakthroughs in performance. In this article, the research progress on 2D TMOs/TMHs and their use in hierarchical structures as supercapacitor materials are reviewed, including the evolution of supercapacitor materials, the configurations of hierarchical structures, the electrical properties regulated, and the existence of advantages and drawbacks. Finally, a perspective covering directions and challenges related to the development of supercapacitor materials is provided.

Keywords: hierarchical structure; integration; supercapacitor; transition metal oxide and hydroxide; two-dimensional nanosheets.

Publication types

Review