Role of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene

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	Role of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene
其他题名	Role of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene
	Mahmood Nasir 1; Tahir Muhammad 2; Mahmood Asif 1; Yang Wenlong 1; Gu Xingxing 1; Cao Chuanbao 2; Zhang Yawen 1; Hou Yanglong 1
	2015
发表期刊	SCIENCE CHINA-MATERIALS
ISSN	2095-8226
卷号	58 期号:2 页码:114-125
摘要	Electrochemical capacitors (EC) bear faster charge-discharge; however, their real applications are still on a long away due to lower capacitance and energy densities which mainly arise from simple surface charge accumulation or/and reaction. Here, a novel synthesis strategy was designed to obtain the purposeful hybrids of nickel cobalt double hydroxide (NiCoDH) with genetic morphology to improve their electrochemical performance as electrode of EC. Nanostructures of metal hydroxides were grown on the nitrogen-doped graphene (NG) sheets by utilizing defects as nucleation sites and their composition was optimized both by tuning the ratio of Ni:Co as well as the counter halogen and carbonate anions to improve the porosity, stabilize the structure and mediate the redox reaction. The growth of the hybrids was guided by the Co ions through topochemical transformation supported by hoping charge transfer process and olation growth. NG overcoating successfully protects the nano-structure of NiCoDH during electrochemical test and enhances overall conductivity of the electrode, improving the mass and ionic transportations. As a result, the hybrid exhibits excellent capacitance of 2925 F g(-1) at 1 A g(-1), as well as long cyclic stability of 10,000 cycles with good capacity retention of 90% at 16 A g(-1). Furthermore, the hybrid shows excellent energy and power densities of 52 Wh kg(-1) and 3191 W kg(-1), respectively at discharge rate of 16 A g(-1). It is expected that this strategy can be readily extended to other metal hydroxides, oxides and sulphides to improve their electrochemical performances.
其他摘要	Electrochemical capacitors (EC) bear faster charge-discharge; however, their real applications are still on a long away due to lower capacitance and energy densities which mainly arise from simple surface charge accumulation or/and reaction. Here, a novel synthesis strategy was designed to obtain the purposeful hybrids of nickel cobalt double hydroxide (NiCoDH) with genetic morphology to improve their electrochemical performance as electrode of EC. Nanostructures of metal hydroxides were grown on the nitrogen-doped graphene (NG) sheets by utilizing defects as nucleation sites and their composition was optimized both by tuning the ratio of Ni:Co as well as the counter halogen and carbonate anions to improve the porosity, stabilize the structure and mediate the redox reaction. The growth of the hybrids was guided by the Co ions through topochemical transformation supported by hoping charge transfer process and olation growth. NG overcoating successfully protects the nanostructure of NiCoDH during electrochemical test and enhances overall conductivity of the electrode, improving the mass and ionic transportations. As a result, the hybrid exhibits excellent capacitance of 2925 F g~(-1) at 1 A g~(-1), as well as long cyclic stability of 10,000 cycles with good capacity retention of 90% at 16 A g~(-1). Furthermore, the hybrid shows excellent energy and power densities of 52 Wh kg~(-1) and 3191 W kg~(-1), respectively at discharge rate of 16 A g~(-1). It is expected that this strategy can be readily extended to other metal hydroxides, oxides and sulphides to improve their electrochemical performances.
关键词	OXYGEN REDUCTION REACTION LITHIUM ION BATTERIES ENERGY DENSITY SUPERCAPACITOR ELECTRODE COMPOSITE NANOCOMPOSITES HYBRID NANOPARTICLES CAPACITANCE NANOSHEETS
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [Research Grants Council] ; [National Natural Science Foundation of China] ; [Beijing Natural Science Foundation] ; [Fund of Beijing National Laboratory for Molecular Sciences] ; [Doctoral Program of the Ministry of Education of China]
CSCD记录号	CSCD:5392956
引用统计	被引频次：6[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/144929
专题	中国科学院金属研究所
作者单位	1.北京大学 2.中国科学院金属研究所
推荐引用方式 GB/T 7714	Mahmood Nasir,Tahir Muhammad,Mahmood Asif,et al. Role of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene[J]. SCIENCE CHINA-MATERIALS,2015,58(2):114-125.
APA	Mahmood Nasir.,Tahir Muhammad.,Mahmood Asif.,Yang Wenlong.,Gu Xingxing.,...&Hou Yanglong.(2015).Role of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene.SCIENCE CHINA-MATERIALS,58(2),114-125.
MLA	Mahmood Nasir,et al."Role of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene".SCIENCE CHINA-MATERIALS 58.2(2015):114-125.