Pollen-inspired synthesis of porous and hollow NiO elliptical microstructures assembled from nanosheets for high-performance electrochemical energy storage

Wang, Shaolan; Li, Wei; Xin, Lipeng; Wu, Ming; Sun, Wenping; Lou, Xiaojie

doi:10.1016/j.cej.2017.03.142

Cited by 40 publications

(11 citation statements)

References 82 publications

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“…Hence, extensive researches have been focused to find proper electrode materials for SCs. Pseudocapacitors mainly store charges from reversible redox reactions and generally composed of transition metal oxides/hydroxides like tin oxide 2 , titanium oxide 3 , cobalt oxide 4,5 , nickel oxide [6][7][8] , vanadium oxide 9 , zinc oxide 10 , manganese oxides [11][12][13][14][15] , cobalt hydroxides [16][17][18][19][20] , nickel hydroxides [21][22][23][24][25] and iron oxides [22][23][24][25][26][27][28][29][30][31][32] . This type of SCs could deliver high specific capacitance, but present poor cycle stability.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Supercapacitive and Superparamagnetic Performances of Iron Oxide Nanoparticles through Yttrium Cations Electro-chemical Doping

et al. 2018

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A one-pot electrosynthesis platform is reported for fabrication of Y 3+ doped iron oxide nanoparticles (Y-IONPs). In this procedure, Y-IONPs are electro-deposited from an additive-free aqueous solution of iron(III) nitrate, iron(II) chloride and yttrium chloride. The analysis data provided by X-ray diffraction (XRD), field emission electron microscopy (FE-SEM) and energy-dispersive X-ray (EDX) confirmed that the deposited Y-IONPs sample is composed of magnetite nanoparticles (size≈20nm) doped with about 10wt% Y 3+ cations. The performance of the prepared Y-IONPs as supercapacitor electrode material was studied using cyclic voltammetry (CV) and galvanostat charge-discharge (GCD) tests. The obtained electrochemical data showed that Y-IONPs provide SCs as high as 190.3 and 138.9 F g −1 at the discharge loads of 0.25 and 1 A g −1 , respectively, and capacity retentions of 95.9% and 88.5% after 2000 GCD cycling. Furthermore, the results of vibrating sample magnetometer measurements confirmed better superparamagnetic behavior of Y-IONPs (Mr=0.32 emu g-1 and H Ci = 6.31 G) as compared with pure IONPs (Mr=0.95 emu g-1 and H Ci = 14.62 G) resulting from their lower Mr and Hci values. Based on the obtained results, the developed electro-synthesis method was introduced as a facile procedure for the preparation of high performance metal ion doped magnetite nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Supercapacitive and Superparamagnetic Performances of Iron Oxide Nanoparticles through Yttrium Cations Electro-chemical Doping

et al. 2018

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“…However, for the hard template method, a high calcination temperature is required to remove the hard template agents, which leads to destruction of the structure of the obtained material. Nature abounds in porous matrices produced by organisms, with examples including pollen, 13 egg white, 14 cotton 15,16 and butterfly wings 17 ; these have attracted attention due to their micron-or nanometer-sized hierarchical pores, which are easily removed under mild conditions. It was reported that Wang et al 13 successfully synthesized a type of efficient nanostructural electrode materials for high-efficiency energy storage via chemical bath deposition using rape pollen as a biotemplate.…”

Section: Introductionmentioning

confidence: 99%

Highly active Mg–Al hydrotalcite for efficient O‐methylation of phenol with DMC based on soft colloidal templates

Tang

Slaný

Yang

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Anisole (AN) is an important compound that has been studied in research into antioxidants, plastic stabilizers, pesticides and dyes. One of the technological alternatives to synthesizing them is using a modified solid catalyst with a soft colloidal template. Synthesis of AN has been demonstrated using dimethyl carbonate (DMC) and phenol over a mixed oxide catalyst derived from Mg-Al hydrotalcite, employing cetyl trimethylammonium bromide (CTAB) as a soft colloidal template. RESULTS: When the reaction was performed at atmospheric pressure in the presence of catalyst (in an amount of 4.5 wt% with respect to the reactants, DMC and phenol) at 200 °C, and a DMC:phenol molar ratio of 2:1 for 8 h, good results were seen for both phenol conversion and selectivity of AN (87.66% and 99.38%, respectively). The yield of AN was 87.11%. CONCLUSION:The characterization of the catalyst demonstrated that the calcination temperature has a significant effect on the structure of the obtained Mg-Al hydrotalcite. Its surface properties and pore diameter distribution resulted in an increased concentration of hierarchical basic sites within the material. Weak and moderate basic sites contributed to the high conversion of phenol and good selectivity of AN. In addition, the thermal stability analysis of the as-prepared Mg-Al mixed oxide showed that the hierarchical structures can be preserved up to 500 °C and eventually be transformed into highly dispersed MgO particles.

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“…To eliminate the aforementioned shortcomings, various attempts have been undertaken. Methods such as improving the specific surface area of materials, 15 decoration and incorporation with carbonaceous materials, 16,17 preparing nickel-containing compounds of bimetal or ternary metals, 18 nickel-containing organic frame structures 19 and doping of non-metallic elements 20 have been reported to have positive effects on nickelbased supercapacitors.…”

Section: Introductionmentioning

confidence: 99%

Oxygen‐vacancy‐rich hydrated bimetallic chloride for supercapacitor cathode with remarkable enhanced performance

2020

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Summary In this study, a series of nickel/vanadium composites were acquired via a simple in situ growth strategy with the sodium chloride as a regulator. The phase, component, and electrochemical energy storage behavior of the as‐prepared electrodes were investigated. Thanks to the addition of sodium chloride for the accession of oxygen vacancy, the prepared composite electrodes show excellent supercapacitor behavior. The resultant NVC‐1.8Ov electrode demonstrates a impressive specific capacitance of 9.41 F cm−2 at a current of 10 mA cm−2, which is about 1.5 times than the NVC electrode. After 5000 charge‐discharge cycles under a current of 40 mA cm−2, the retained 75.7% of its initial capacitance indicate a good cyclic stability. In addition, the NVC‐1.8Ov and activated carbon (AC) was used to assemble NVC‐1.8Ov//AC asymmetric supercapacitor, which deliver a maximum energy density of 0.471 mWh cm−2 at a power density of 9.319 mW cm−2. This work provides a new and simple strategy for the preparation of high specific capacitance of asymmetric supercapacitor positive electrode.

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Pollen-inspired synthesis of porous and hollow NiO elliptical microstructures assembled from nanosheets for high-performance electrochemical energy storage

Cited by 40 publications

References 82 publications

Enhancing the Supercapacitive and Superparamagnetic Performances of Iron Oxide Nanoparticles through Yttrium Cations Electro-chemical Doping

Enhancing the Supercapacitive and Superparamagnetic Performances of Iron Oxide Nanoparticles through Yttrium Cations Electro-chemical Doping

Highly active Mg–Al hydrotalcite for efficient O‐methylation of phenol with DMC based on soft colloidal templates

Oxygen‐vacancy‐rich hydrated bimetallic chloride for supercapacitor cathode with remarkable enhanced performance

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