One-pot synthesis of hierarchical MnO2-modified diatomites for electrochemical capacitor electrodes

Zhang, Jintao; Huang, Ming; Li, Fēi; Wang, Xue Li; Zhong, Wen

doi:10.1016/j.jpowsour.2013.07.115

Cited by 175 publications

(106 citation statements)

References 53 publications

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“…MnO 2 electrodes with melosira diatom replica showed the highest supercapacitance performance with C sp of 371.2 F g −1 at a current density of 0.5 A g −1 (Figure 5d 1 ), 54.7% capacitance retention (Figure 5d 2 ) and excellent cycling stability (93.9% retention after 2000 cycles at 5 A g −1 , Figure 5d 3 ). Another 3D MnO 2 nanostructure was also prepared after etching MnO 2 -modified diatomites in NaOH solution [109] with a high C sp of 297.8 F g −1 at the current density of 0.25 A g −1 .…”

Section: Biological Mineral Based Templatementioning

confidence: 99%

Bio‐Nanotechnology in High‐Performance Supercapacitors

Zhang

Wang

et al. 2017

Advanced Energy Materials

173

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on seeking suitable electrode materials, and optimizing the electrode/electrolyte and electrode/current collector interface properties. As the core of such energystorage devices, the electrode materials directly determine the processing cost and performance of devices, such as their rate capability, specific capacitance (C sp ), cycling stability, etc, which enable the safe and highly-efficient use of energy. [1a,3] Based on the mechanisms of charge storage, SC electrodes can be classified as electric double layer electrodes (EDLEs), pseudocapacitive electrodes, and hybrid electrodes. Most of the EDLEs use carbon materials (activated carbon (AC), [4] carbon nanotubes (CNTs), [5] carbon nanofibers (CNFs), [6] graphene (GN), [7] etc.) as the electrode active materials and store energy only by electrostatic accumulation at the electrode/electrolyte interface. EDLEs usually show high charge-discharge rates and high cycling stability, while their energy densities (≈5 W h kg −1 ) are often greatly limited by the Brunauer-Emmett-Teller (BET) specific surface area (S BET ) and the pore size distribution of electrode materials. Pseudocapacitive electrodes are generally based on conductive polymers (polypyrrole (PPy), polyaniline (PANI), polythiophene, etc.) [8] and transition metal oxides/ hydroxides (Fe 3 O 4 , MnO 2 , RuO 2 , NiO, Co 3 O 4 , Ni(OH) 2 , etc.), [9] and use reversible faradic processes for energy storage. Compared to EDLEs, pseudocapacitive electrodes can offer much higher storage capabilities because of the faradic reactions involved. In the case of transition metal oxides/hydroxides, however, their poor electrical conductivity generally leads to low power density. In addition, the easily damaged structures of conductive polymers during the faradic processes usually lead to poor cycling stability. To resolve these problems, hybrid electrodes (GN/PPy, CNTs/PPy, GN/MnO 2 , PPy/MnO 2 , NiMoO 4 / PANI, CNTs/MoS 2 , PPy/MoS 2 , etc.) [10] have been developed to take complete advantage of both EDLEs and pseudocapacitive electrodes. For a long time, nanotechnological techniques have been considered as promising approaches to prepare highly efficient SC electrodes. [1b,11] Compared with micro-and submillimeter materials, nanomaterials as active SC electrodes have the following advantages: [12] (1) A high S BET means sufficient electroactive sites and thus high capacity utilization of electrode materials; (2) Intrinsic porous structures and small particle sizes, which contribute to the complete penetration of the electrolyte and reduce the diffusion path of electrolyte ions; (3) Highly ordered hierarchical structures can relieve the stress within the materials and offer stable channels for electron transfer, which can ensure good cycling stability; (4) The The use of bio-nanotechnology for the fabrication of diverse functional nanomaterials with precisely controlled morphologies and microstructures is attracting considerable attention due to its sustainability and renewability. As one of the key energy storag...

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Section: Biological Mineral Based Templatementioning

confidence: 99%

Bio‐Nanotechnology in High‐Performance Supercapacitors

Zhang

Wang

et al. 2017

Advanced Energy Materials

173

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“…32 After the second anodization for 60 min, the anodizing potential would be decreased from 195 V to 70 V at the rate of 2 V/min for thinning the barrier layer. Then, in order to widen the hole and thin the barrier layer further, PAA templates were immersed in 5 wt% H 3 PO 4 solution at 30 C for 80 min. Subsequently, the PAA template and platinum electrode were, respectively, regarded as the work electrode and the counter electrode, and immersed into 3 g/L AgNO 3 and 16 g/L H 2 SO 4 mixture solution for 5 min to ensure the electrolyte into the channels of PAA template, electrochemical deposition was performed under 13 V alternating voltage AC potential for 15 min.…”

Section: Experimental and Characterizationmentioning

confidence: 99%

“…[5][6][7][8] Silver nanostructures with excellent electrical and thermal conductivity, optical property, biocompatibility, antibacterial property, and large specific surface area were applied in many fields, [9][10][11][12] such as wearable electronic devices, 13 liquid crystal display, 14 solar cell, 15 strain sensing, 16 gas sensing, 17 biological sensing, 18 optics, 19 surface-enhanced Raman scattering, 20 and the catalytical electrode 21 and others. Usually, synthesis methods of silver nanostructure are composed of chemical and physical categories including polyol method, 22 solvothermal method, 23 ultraviolet irradiation method, 24 photoreduction method, 25 electrochemical method, 26 porous material template method, [27][28][29][30] and wet chemical method. 31 However, wet chemical method has many disadvantages like requiring organic solvents, reaction atmosphere, heating, stirring, injecting, and different varieties of additives such as inorganic anions and metal cations.…”

Section: Introductionmentioning

confidence: 99%

A template/electrochemical deposition method for fabricating silver nanorod arrays based on porous anodic alumina

Líu

et al. 2017

Nanomaterials and Nanotechnology

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A template/electrochemical deposition method for fabricating silver nanorod arrays based on porous anodic alumina was presented. The barrier layer of porous anodic alumina templates was thinned by step-by-step voltage decrement method. Subsequently, silver ions were reduced into the channels of porous anodic alumina templates by electrochemical deposition method. Electrochemical impedance spectroscopy was utilized for analyzing the thickness of barrier layer of porous anodic alumina templates; the elementary composition and the size of silver nanorod arrays were characterized by X-ray diffraction and field-emission scanning electron microscope, respectively. Experimental results showed that the thickness of barrier layer of porous anodic alumina was suitable for alternating current electrochemical deposition, when anodizing potential was decreased to 70 V and widening time of porous anodic alumina in H 3 PO 4 solution is 80 min. And the silver particles could be deposited into the channels of porous anodic alumina templates at 11 V, 13 V, and 15 V. Different sizes of silver nanorod arrays were obtained by controlling the deposition time. The average diameter of silver nanorod is in the range from 346 nm to 351 nm which is almost consistent with the pore diameter of porous anodic alumina templates (367 nm). The uniform silver nanorod arrays have a considerable potential in the flexible and wearable electronic devices, optics, solar cell, the catalytical electrode, and so on.

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“…Meanwhile, the adsorption band after copper sorption at 1319 cm −1 has disappeared. Moreover, the absorption peaks in the infrared spectrum of the sorbent after sorption at low frequencies below 700 cm −1 are probably due to Cu-O vibrations (Zhang et al 2013). …”

Section: Characterizationmentioning

confidence: 99%

Removal of Cu(II) from Water Samples Using Glycidyl Methacrylate-Based Polymer Functionalized with Diethylenetriamine Tetraacetic Acid: Investigation of Adsorption Characteristics

Yayayürük

2016

Water Air Soil Pollut

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A macroporous glycidyl methacrylate (GMA)-methylmethacrylate (MMA)-divinyl benzene ( D V B ) t e r p o l y m e r f u n c t i o n a l i z e d w i t h diethylenetriamine tetraacetic acid (DTTA) (GMA-MMA-DVB-DTTA) sorbent was successfully applied for the uptake of Cu(II) from the aqueous solutions. Adsorption characteristics for copper ion were investigated by a batch sorption in under different experimental conditions, and the optimum parameters for the quantitative sorption of Cu(II) ion were found to be as follows: pH of 7.0, a contact time of 30.0 min, and a sorbent amount/solution volume ratio of 1.5 mg/mL. The quantitative elution from the sorbent was performed with 1.0 M HCl (>95 %). Among three kinetic models, the pseudo-second-order kinetic model provides the best correlation for the process. The nonlinear resolution of the Langmuir isotherm equation has been found to show the closest fit to the equilibrium data. The results indicates that the presence of the competitor ions (Al, Ba, Co, Mn, Mg, and Ni) has no obvious influence on the sorption of Cu(II) ion under the optimum conditions and the polymeric sorbent has a good selectivity for the sorption of Cu(II) ions with a sorption percent of ≥99 %. Sorption/desorption studies were performed for ultrapure, tap, bottled drinking and industrial wastewater samples, and it is examined that the proposed method has been successfully applied to the real samples for the removal of Cu(II) acceptable accuracy and precision. The results of this work indicated that the polymeric sorbent could be a simple and suitable method for the effective removal of Cu(II) ions from waters.

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One-pot synthesis of hierarchical MnO2-modified diatomites for electrochemical capacitor electrodes

Cited by 175 publications

References 53 publications

Bio‐Nanotechnology in High‐Performance Supercapacitors

Bio‐Nanotechnology in High‐Performance Supercapacitors

A template/electrochemical deposition method for fabricating silver nanorod arrays based on porous anodic alumina

Removal of Cu(II) from Water Samples Using Glycidyl Methacrylate-Based Polymer Functionalized with Diethylenetriamine Tetraacetic Acid: Investigation of Adsorption Characteristics

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