固体微结构物理国家重点实验室,人工微结构科学与技术协同创新中心,江苏省功能材料设计原理与应用技术 重点实验室,南京大学现代工程与应用科学学院,江苏 南京 210093
李鑫健(1996—),女,硕士研究生,2014—2018年在南京大学获学士学位,2018年至今在南京大学攻读硕士学位,lixinjian@smail.nju.edu.cn
王学斌(1983—),男,博士,教授,2002—2009年在南京大学化学系获学士和硕士学位,2015年至今在南京大学现代工程与应用科学学院工作,wangxb@nju.edu.cn
收稿:2020-06-22,
修回:2020-09-08,
网络首发:2020-11-03,
纸质出版:2020-11-05
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李鑫健, 王保禄, 高天, 王旗, 王学斌. 三维筋撑石墨烯负载氧化锰的超级电容器[J]. 化工学报, 2020, 71(11): 5025-5034
LI Xinjian, WANG Baolu, GAO Tian, WANG Qi, WANG Xuebin. Three-dimensional strutted graphene loading manganese oxide for supercapacitor[J]. CIESC Journal, 2020, 71(11): 5025-5034
李鑫健, 王保禄, 高天, 王旗, 王学斌. 三维筋撑石墨烯负载氧化锰的超级电容器[J]. 化工学报, 2020, 71(11): 5025-5034 DOI: 10.11949/0438-1157.20200797.
LI Xinjian, WANG Baolu, GAO Tian, WANG Qi, WANG Xuebin. Three-dimensional strutted graphene loading manganese oxide for supercapacitor[J]. CIESC Journal, 2020, 71(11): 5025-5034 DOI: 10.11949/0438-1157.20200797.
石墨烯基超级电容器,其功率密度较高,但能量密度受限。开发以三维石墨烯材料为载体的复合型赝电容多孔电极,是解决方案之一。本文采用铵盐辅助化学发泡法,制备了三维筋撑石墨烯泡沫体(SG);以SG为载体,采用水热还原法在其表面生长二氧化锰(MnO
2
)纳米棒阵列,从而构建了MnO
2
/SG自支撑多孔材料。利用MnO
2
/SG复合电极,组装了超级电容器,在0.5 A·g
-1
的电流密度下,比电容达343.6 F·g
-1
;经5000次循环,其容量保持率为83.8%;在500 W·kg
-1
的功率密度下,其能量密度达11.93 W·h·kg
-1
。因此,MnO
2
/SG复合电极是一种性能优异的赝电容材料,在电化学储能领域有良好的应用前景。
Graphene has shown superiorit
y for advanced carbon electrodes in supercapacitors, characterized by high power density but limited energy density. Combining pseudocapacitive materials with graphene can alleviate the problem. This work synthesized the three-dimensional strutted graphene (SG)
via
the ammonium-salt-assisted sugar-blowing method
and the self-supporting MnO
2
/SG porous monolith was then constructed
via
growing manganese oxide (MnO
2
) nanorod array on the SG support in hydrothermal process. When tested in supercapacitor, the MnO
2
/SG hybrid electrode achieved a high specific capacitance of 343.6 F·g
-1
at a current density of 0.5 A·g
-1
, exhibiting excellent cycling stability with 83.8% capacitance retention after 5000 cycles. The symmetric supercapacitor further showed a high energy density of 11.93 W·h·kg
-1
at a power density of 500 W·kg
-1
. The impressive result indicates a promising prospect of the excellent MnO
2
/SG hybrid to be applied to electrochemical energy storage.
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