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Role of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene
Alternative TitleRole of anions on structure and pseudocapacitive performance of metal double hydroxides decorated with nitrogen-doped graphene
Mahmood Nasir1; Tahir Muhammad2; Mahmood Asif1; Yang Wenlong1; Gu Xingxing1; Cao Chuanbao2; Zhang Yawen1; Hou Yanglong1
2015
Source PublicationSCIENCE CHINA-MATERIALS
ISSN2095-8226
Volume58Issue:2Pages:114-125
AbstractElectrochemical 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.
Other AbstractElectrochemical 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.
KeywordOXYGEN REDUCTION REACTION LITHIUM ION BATTERIES ENERGY DENSITY SUPERCAPACITOR ELECTRODE COMPOSITE NANOCOMPOSITES HYBRID NANOPARTICLES CAPACITANCE NANOSHEETS
Indexed ByCSCD
Language英语
Funding Project[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 IDCSCD:5392956
Citation statistics
Cited Times:6[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/144929
Collection中国科学院金属研究所
Affiliation1.北京大学
2.中国科学院金属研究所
Recommended Citation
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.
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