A perspective on graphene for supercapacitors: Current status and future challenges

• 作者: Feng Su Zhong-Shuai Wu
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（2）
• 页码范围: 354-357
• 页数: 4页
• 语种: 英文

摘要

Supercapacitors, also known as ultracapacitors or electrochemical capacitors, possess intriguing merits of high power density (10-100 times higher than that of batteries), long life expectancy (millions of cycles), wide operation temperature range (-40 ℃ to 70 ℃), environmental friendliness, and high energy efficiency (90％-95％).Therefore, supercapacitors have drawn great attention in various applications, such as public transportation, hybrid heavy vehicles, rail network, wind blades, back power, and portable consumer electronics.Currently, searching high-performance electrode materials is still the key for the development of supercapacitors.Recently, two-dimensional (2D) materials have exhibited superior capacitive or pseudocapacitive performance due to the increased surface area and enriched electrochemically active sites [1,2].Among these materials, graphene, a 2D monolayer of sp2-bonded carbon atoms with the unique combination of large specific surface area (SSA, 2630 m2 g-1), extraordinary conductivity, physicochemical stability and mechanical properties, holds great promise for multiple types of high-performance and newconcept supercapacitors (Fig.1).In principle, graphene can serve as (1) a highly active material, (2) an ideal substrate for hybrids,and (3) a flexible structural material (binder) and conductive additive in electrodes.