新碳源制备活性炭和石墨烯及其非等电极电容水系超级电容器

doi:10.3866/PKU.WHXB201904025

物理化学学报 >> 2020, Vol. 36 >> Issue (2): 1904025.doi: 10.3866/PKU.WHXB201904025

所属专题：超级电容器

新碳源制备活性炭和石墨烯及其非等电极电容水系超级电容器

陈尧^1,*(),陈政^1,^2,^3,*()

¹ 武汉科技大学材料与冶金学院，省部共建耐火材料与冶金国家重点实验室，武汉 430081
² 宁波诺丁汉大学科学与工程学院化学与环境工程系，浙江宁波 315100
³ 诺丁汉大学工程学院化学与环境工程系，诺丁汉NG2 7RD，英国

收稿日期:2019-04-03 录用日期:2019-06-07 发布日期:2019-06-17
通讯作者: 陈尧,陈政 E-mail:y.chen@wust.edu.cn;george.chen@nottingham.ac.uk
作者简介:Yao Chen (ORCID: 0000-0003-0147-8156) obtained his PhD degree from Institute of Electrical Engineering, Chinese Academy of Sciences under Prof. Yanwei Ma's supervision in 2012. He then completed his postdoc research in IFW Dresden, Germany, together with Prof. Oliver Schmidt and in AIST Kansai, Japan with Prof. Qiang Xu. Since 2015, as an instructor, he had joined Wuhan University of Science and Technology where he was mainly engaged in research on carbon based electrochemical energy storage devices and heterogeneous catalysis|George Z. Chen (ORCID: 0000-0002-5589-5767) graduated from Jiujiang Teachers Training College with a Diploma in 1981, Fujian Normal University with the MSc in 1985, and the University of London with the PhD and DIC in 1992. After contracted work in the Universities of Oxford, Leeds and Cambridge, he joined the University of Nottingham in 2003, and has been Professor since 2009. He is Li Dak Sam Chair Professor of the University of Nottingham Ningbo China, and Specially Invited Professor of Wuhan University of Science and Technology. His research aims at electrochemical and liquid salts innovations for materials, energy and environment
基金资助:
华中科技大学材料成形与模具技术国家重点实验室开放基金(P2019-014);宁波市政府(3315计划);宁波市政府(2014A35001-1)

New Precursors Derived Activated Carbon and Graphene for Aqueous Supercapacitors with Unequal Electrode Capacitances

Yao Chen^1,*(),George Zheng Chen^1,^2,^3,*()

¹ The State Key Laboratory of Refractories and Metallurgy, College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
² Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Ningbo China, Ningbo 315100, Zhejiang Province, P. R. China
³ Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham NG2 7RD, UK

Received:2019-04-03 Accepted:2019-06-07 Published:2019-06-17
Contact: Yao Chen,George Zheng Chen E-mail:y.chen@wust.edu.cn;george.chen@nottingham.ac.uk
Supported by:
State Key Laboratory of Materials Processing and the Die & Mould Technology, Huazhong University of Science and Technology, China(P2019-014);the Ningbo Municipal Government, China(3315计划);the Ningbo Municipal Government, China(2014A35001-1)

摘要/Abstract

摘要：

碳材料具有不同的微米和纳米结构以及本体和表面的官能基团，因此成为最普遍采用的超级电容器电极材料。典型的例子是活性炭和石墨烯。最近的研究趋势是通过新方法，以传统和新碳源，例如生物质、聚合物、氧化石墨、碳氢以及二氧化碳气体，来制备成本低、电容性能高的活性炭和石墨烯。特别是，大多数新碳源衍生碳非常适用于水系电解液。电荷存储不仅发生在“碳|电解液”界面上(形成双电层)，也依靠本体和表面的官能化带来的氧化还原活性，包括有限离域价电子转移反应。此外，进一步理解电荷存储机制有助于设计出比传统对称电容器具有更高电压和比能量的非等电极电容水系超级电容器。本文综述了新碳源衍生碳材料和器件的最新进展，为超级电容器技术的持续发展助力。

关键词: 新碳源, 活性炭, 石墨烯, 水系电容器, 非等电极电容

Abstract:

Carbon materials can offer various micro- and nanostructures as well as bulk and surface functionalities; hence, they remain the most popular for manufacturing supercapacitors. This article critically reviews recent developments in the preparation of carbon materials from new precursors for supercapacitors. Typical examples are activated carbon (AC) and graphene, which can be prepared from various conventional and new precursors such as biomass, polymers, graphite oxide, CH₄, and even CO₂ via innovative processes to achieve low-cost and/or high specific capacitance. Specifically, when producing AC from natural biomasses or synthetic polymers, either new, spent, or waste, popular activation agents, such as KOH and ZnCl₂, are often used to process the ACs derived from these new precursors while the respective activation mechanisms always attract interest. The traditional two-step calcination process at high temperatures is widely employed to achieve high performance, with or without retaining the morphology of the precursors. The three-step calcination, including a post-vacuum treatment, is also the preferred choice in many cases, but it can increase the cost per capacity (kWh∙g⁻¹). More recently, one-step molecular activation promises a better and more economical approach to the commercial application of AC, although further increase of the yield is necessary. In addition to activation, graphitization, N doping, and template control can further improve ACs in terms of the charging and discharging rates, or pseudocapacitance, or both. Considerations are also given to material structure design, and carbon regeneration during activation. Metal-organic frameworks, which were initially used as templates, have been found to be good direct carbon precursors. Various graphene structures, including powders, films, aerogels, foams, and fibers, can be produced from graphite oxide, CO₂, and CH₄. Similar to AC, graphene can possess micropores by activation. Self-propagating high-temperature synthesis and molten salt processing are newly-reported methods for fabrication of mesoporous graphene. Macroporous graphene hydrogels can be produced by hydrothermal treatment of graphite oxide suspension, which can also be transferred into films. Hierarchically porous structures can be achieved by H₂O₂ etching or ZnCl₂ activation of the macroporous graphene precursor. Sponges as templates combined with KOH activation are applied to create both micro- and macropores in graphene foams. Graphene can grow on fibers and textiles by electrodeposition, dip-coating, or filtration, which can be woven into clothes with a large area or thick loading, illuminating the potential application in flexible and wearable supercapacitors. The key obstacles in AC and graphene production are high cost, low yield, low packing density, and low working potential range. Most Carbon materials derived from new precursors work very well with aqueous electrolytes. Charge storage occurs not only in the electric double layer (i.e., the "carbon | electrolyte" interface), but also via redox activity in association with the bulk and surface functionalities, and the resulting partial delocalization of valence electrons. The analysis of the capacitive electrode has shown a design defect that prevents the working voltage of a symmetrical supercapacitor from reaching the full potential window of the carbon material. This defect can be avoided in AC-based supercapacitors with unequal electrode capacitances, leading to higher cell voltages and hence higher specific energy than their symmetrical counterparts. There are also emerging ways to raise the energy capacity of AC supercapacitors, such as the use of redox electrolytes to enable the Nernstian charge storage mechanism, and of the three dimensional printing method for a desirable electrode structure. All these developments are promising carbon materials from various precursors of new and waste sources for a more affordable and sustainable supercapacitor technology.

Key words: New precursor, Activated carbon, Graphene, Aqueous supercapacitor, Unequal electrode capacitance

MSC2000:

O646

陈尧,陈政. 新碳源制备活性炭和石墨烯及其非等电极电容水系超级电容器[J]. 物理化学学报, 2020, 36(2): 1904025.

Yao Chen,George Zheng Chen. New Precursors Derived Activated Carbon and Graphene for Aqueous Supercapacitors with Unequal Electrode Capacitances[J]. Acta Physico-Chimica Sinica, 2020, 36(2): 1904025.

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Precursors ^Ref.	Activation reagents	Step number ^a	Surface area/(m²·g^-1)	Electrolyte	Current load	Capacitance/(F·g^-1)
Coconut shell ³⁷	ZnCl₂+FeCl₃	1	1874	6 mol·L^-1 KOH	1 A·g^-1	276 ^b
Agar ²⁷	KOH	1	1672	6 mol·L^-1 KOH	0.25 A·g^-1	228 ^b
C₉H₇N₃ ²⁸	KOH	1	2980	1 mol·L^-1 Na₂SO₄	0.5 A·g^-1	221 ^b
PDB ⁴²	KOH	1	2660	6 mol·L^-1 KOH	0.2 A·g^-1	290 ^b
Gelatin ²⁶	KOH	2	3692	6 mol·L^-1 KOH	0.5 A·g^-1	305 ^b
Sonicated ZIF-8 ⁵³	KOH	2	2972	1 mol·L^-1 H₂SO₄	10 mV·s^-1	211 ^b
MOF-74 ⁵⁶	KOH	2	1492	1 mol·L^-1 H₂SO₄	1 A·g^-1	168 ^b
Resin+Melamine ⁴¹	KOH	3	2234	3 mol·L^-1 H₂SO₄	0.1 A·g^-1	309 ^b
ZIF-8 ⁵²	–	1	1075	0.5 mol·L^-1 H₂SO₄	50 mV·s^-1	128
PPEA ³⁶	KOH	1	3103	1 mol·L^-1 H₂SO₄	1 A·g^-1	356
Willow catkin ²²	KOH	2	1776	6 mol·L^-1 KOH	1 A·g^-1	292
Pitch ⁴⁵	KOH	2	762	6 mol·L^-1 KOH	2 mV·s^-1	294
Egg white ⁴³	KOH	2	1217	1 mol·L^-1 KOH	0.25 A·g^-1	525
Bamboo ²⁵	KOH	3	1472	6 mol·L^-1 KOH	0.1 A·g^-1	301

Materials ^Ref.	SSA/(m²·g^-1)	Electrolyte	Capacitance/(F·g^-1)
Molten salt G ⁷⁹	187	6 mol·L^-1 KOH	435 (522 F·cm^-3)
Holey G film ⁸¹	810	6 mol·L^-1 KOH	310 ^a
Sponge-template G ⁸⁸	2582	6 mol·L^-1 KOH	188 ^a
G-CNT textile ⁹⁵	160	5 mol·L^-1 LiCl	250 ^a
		PVA/LiCl	107 F·cm^-3 ^a

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新碳源制备活性炭和石墨烯及其非等电极电容水系超级电容器

New Precursors Derived Activated Carbon and Graphene for Aqueous Supercapacitors with Unequal Electrode Capacitances

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