Controllable preparation of multishelled NiO hollow nanospheres via layer-by-layer self-assembly for supercapacitor application

Yang, Zeheng; Xu, Feifei; Zhang, Weixin; Mei, Zhousheng; Pei, Bo; Zhu, Xiao

doi:10.1016/j.jpowsour.2013.07.057

Cited by 231 publications

(124 citation statements)

References 31 publications

Supporting

Mentioning

122

Contrasting

Order By: Relevance

“…The carbon spheres were prepared according to previous report. 17 In total, 6.93 g sucrose was dissolved in 70 ml distilled water and stirred with a magnetic stirrer to obtain a clear solution. Then the solution was transferred into a Teflon-lined autoclave of 100 ml capacity and kept at 190°C for 2 h. When the reaction finished, the reactors were cooled to room temperature naturally.…”

Section: Experimental Procedures Preparation Of Nico 2 O 4 Double and mentioning

confidence: 99%

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

et al. 2015

View full text Add to dashboard Cite

Increasing specific surface area and electrical conductivity are two crucial ways to improve the capacitive performance of electrode materials. Nanostructure usually enlarges the former but reduces the later; thus, it is still a great challenge to overcome such contradiction. Here, we report hydrogenated NiCo 2 O 4 double-shell hollow spheres, combining large specific surface area and high conductivity to improve the capacitive performance of supercapacitors. The specific surface area of NiCo 2 O 4 hollow spheres, fabricated via programmed coating of carbon spheres, was enlarged 50% (from 76.6 to 115.2 m 2 g − 1 ) when their structure was transformed from single-shell to double-shell. Furthermore, activated carbon impedance measurements demonstrated that the low-temperature hydrogenation greatly decreased both the internal resistance and the Warburg impedance. Consequently, a specific capacitance increase of 462%, from 445 to 718 F g − 1 , was achieved at a current density of 1 A g − 1 .Underlying such great improvement, the evolution of chemical valence and defect states with co-increase of these two factors was explored through X-ray photoelectron spectroscopy. Moreover, a full cell combined with NiCo 2 O 4 and AC was assembled, and an energy density of 34.8 Wh kg − 1 was obtained at a power density of 464 W kg − 1 . NPG Asia Materials (2015) 7, e165; doi:10.1038/am.2015.11; published online 13 March 2015 INTRODUCTION Supercapacitors, also known as electrochemical capacitors, have attracted great attention because of their outstanding power density, long cycling life and fast charge/discharge ability. 1-3 These virtues make them remarkable candidates for the electrical sources of hybrid electric vehicles, for which strong explosiveness is highly desired. Principally, supercapacitors run according to ion adsorption (electrochemical double-layer capacitors) or fast Faradaic reactions (pseudocapacitors) mechanisms. Comparatively speaking, the former has low specific capacitance and hence hard to satisfy the growing demand of peak-power assistance in electric vehicles. 4 Thus, more and more attentions were focused on pseudocapacitive electrode materials because their energy density associated with Faradaic reactions is much larger than that of electrochemical double-layer capacitors. [5][6][7][8] To improve performances of pseudocapacitors, two crucial factors are usually considered for the electrode materials, they are large specific surface area and high conductivity for electrolyte ions and electrons. On the one hand, large specific surface area will provide more electroactive sites for the Faradaic reactions, and load more doublelayer charges. Along such idea, many kinds of nanomaterials, 9-11 especially hollow spheres, 12 have been developed to improve

show abstract

Section: Experimental Procedures Preparation Of Nico 2 O 4 Double and mentioning

confidence: 99%

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Zhu et al [102] Using a facile, low-cost, and environment-friendly template method, Liu et al [103] successfully prepared hierarchical mesoporous NiO nanoarrays (NiOHMNAs). The synthesis process of NiO-HMNAs is shown in Fig.…”

Section: Nickel Oxidesmentioning

confidence: 99%

Hierarchically nanostructured transition metal oxides for supercapacitors

et al. 2017

View full text Add to dashboard Cite

“…Furthermore, the sub-nanometer level thickness of the exfoliated 2D nanosheets makes possible an optimization of the power density of 2D nanosheet-based hybrid materials via a strong electronic coupling with hybridized conductive materials. [188][189][190][191][192][193][194][195][196][197] Because of the unique microstructure with combination of two 2D materials and having high surface area due to their novel crystal structure, TMDCs/graphene hybrids have a potential to significantly enhance the electrochemical performance as supercapacitor electrodes 193,[198][199][200] . The success of applying a homo or heterogeneous nanostructured hybrid materials for supercapacitors, strongly depends on the factors such as: employment of proper synthesis methods to prepare the desired nanostructure; selection of a proper combination of different materials; designation and optimization of the heterogeneous nanostructure 193,[198][199][200] .…”

Section: Canadian Chemical Transactionsmentioning

confidence: 99%

Emerging Energy Applications of Two-Dimensional Layered Materials

2015

Can Chem Trans

View full text Add to dashboard Cite

Atomically thin semiconducting transition metal dichalcogenides (TMDCs) layered materials have recently been emerged as an exciting area of research due to accessibility for easy synthesis using various chemical and physical methods. These two-dimensional (2D) layered materials with single layer have direct and wide band gap due to which, they are more suitable for nanoelectronics and optoelectronics device applications. Here, we present a review of the energy related aspects of atomically thin layered materials like MoS 2 , WS 2 , MoSe 2 , WSe 2 , InSe, GaSe, GaTe, MoTe 2 , WTe 2 etc. for supercapacitor, solar cell, lithium ion battery and water splitting application. By significantly assessing various materials and comparing their performances with challenging technology, the advantages and disadvantages of this promising area of energy materials are recognized, which may provide guidelines for future progress.

show abstract

Controllable preparation of multishelled NiO hollow nanospheres via layer-by-layer self-assembly for supercapacitor application

Cited by 231 publications

References 31 publications

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

Hierarchically nanostructured transition metal oxides for supercapacitors

Emerging Energy Applications of Two-Dimensional Layered Materials

Contact Info

Product

Resources

About