Remarkable Capacity Retention of Nanostructured Manganese Oxide upon Cycling as an Electrode Material for Supercapacitor

Ragupathy, P.; Park, Daehoon; Campet, G.; Vasan, H. N.; Hwang, Seong‐Ju; Choy, Jin‐Ho; Munichandraiah, N.

doi:10.1021/jp811407q

Cited by 250 publications

(205 citation statements)

References 51 publications

Supporting

Mentioning

186

Contrasting

Unclassified

Order By: Relevance

“…At a scan rate of 1 mV s -1 , CMHS and MHS produced Csp,CV specific capacitances of 239.8 F g -1 and 178.3 F g -1 respectively. The higher CMHS value coincides with its higher BET value, which is in accordance with theory [37][38][39][40] . In addition, the specific balance of mixed phases in CMHS may be another factor contributing to its higher observed specific capacitance, resulting from possibly improved surface conductivity [26][27][28][29] .…”

supporting

confidence: 88%

Cage-like MnO 2 -Mn 2 O 3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

Wang

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

supporting

confidence: 88%

Cage-like MnO 2 -Mn 2 O 3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

Wang

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

show abstract

“…This peak is related with a layered structure composed of MnO 6 octahedra edge-shared. 14,24 By comparing the sample spectra and the obtained from our standard materials and others shown in the literature, 25 it is possible to conclude that, although amorphous, the type and concentration of manganese sites is approximately the same in our sample and δ and g-MnO 2 . Figure 2 shows a FESEM image of a film obtained from template electrodeposition.…”

Section: Macroporous Mno 2 Film Characterizationsupporting

confidence: 55%

“…At 0.04 V s -1 , the obtained C is 259 Fg -1 , which is a quite interesting value considering recent results reported for nanostructured MnO 2 films. 14,43,44 In an earlier contribution, Nakayama et al 45 obtained macroporous MnO 2 films by template electrodeposition of approximately 740 nm pore diameter polystyrene nanospheres from a MnSO 4 aqueous solution, reporting on a KCl aqueous solution electrolyte with a C value of about half of that obtained in this work. These results show that, in order to obtain good electrochemical performance, several aspects must be taken into account, such as film preparation conditions and the electrolyte used.…”

Section: Electrochemical Characterizationmentioning

confidence: 50%

“…[6][7][8][9] The electrochemical performance of MnO 2 -based supercapacitors and the mechanism of energy storage depend on several aspects, such as morphology, 10,11 structure 12,13 and post synthesis thermal treatment. 14 The major interest is to use MnO 2 as positive electrode together with carbon as negative electrode in hybrid systems, improving the cell voltage, thus, improving energy and power densities. 15 In a previous work 16 the obtention of macroporous MnO 2 electrodes has been briefly reported together with the preparation of other electroactive porous thin films, showing the potential application of the methodology.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Macroporous MnO2 electrodes obtained by template assisted electrodeposition for electrochemical capacitors

Benedetti¹,

Petri²,

Torresi³

et al. 2010

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

Eletrodos macroporosos de MnO 2 foram preparados por eletrodeposição assistida por molde de partículas esféricas coloidais de poliestireno. A molhabilidade desses filmes foi estudada por medidas de ângulo de contato. Medidas de voltametria cíclica foram realizadas com o objetivo de estudar o seu comportamento como eletrodo para supercapacitores. A capacitância específica obtida foi cerca de 60% maior que a obtida por um eletrodo liso, o que mostra que apesar de a molhabilidade do eletrodo macroporoso ser menor, ocorre alguma penetração do eletrólito pelos poros, aumentando a área eletroativa. Por fim, o eletrodo macroporoso apresentou excelente establidade eletroquímica, não sendo observada queda de capacitância após 1000 ciclos de carga e descarga.Macroporous MnO 2 electrodes prepared by template-assisted electrodeposition using spherical polystyrene colloidal particles are studied. The wettability of such electrodes by a LiClO 4 aqueous electrolyte is measured by the contact angle technique. Cyclic voltammetry experiments are performed in order to evaluate the use of these electrodes for electrochemical capacitor applications. The specific capacity obtained is about 60% higher than that obtained for flat MnO 2 surfaces showing that, in spite of the wettability being lower, some penetration of the electrolyte into the pores must occur, increasing the electroactive area with respect to the flat electrode. Furthermore, the macroporous electrode showed excellent electrochemical stability, with neither a capacitance decrease nor a loss of morphology, after 1000 cycles.Keywords: supercapacitors, manganese oxide, porous electrodes, template assisted electro deposition, wettability IntroductionLi-ion batteries are widely used as energy sources for portable electronic devices, and several studies have been carried out in order to improve their performance.1 As charge/discharge processes are limited by reaction kinetics, 2 the search for devices that can deliver high power is an active field. Electrochemical capacitors or supercapacitors are high power sources that can be fully charged/discharged in seconds because they are based on surface faradaic reactions and/or double-layer capacitance.3,4 These devices can be applied together with a battery in order to allow both high energy and power or to replace conventional capacitors based on electrical charge separation. The preparation of high surface area electrodes can improve device performance because more material is available on the surface for charge compensation as well as for energy storage. 2Concerning redox-active materials for supercapacitors, RuO 2 presents the best capacitance values. However, its high cost does not allow its use in practical applications. 5 An alternative low cost, non toxic and environmentally friend material is MnO 2 .6-9 The electrochemical performance of MnO 2 -based supercapacitors and the mechanism of energy storage depend on several aspects, such as morphology, 10,11 structure 12,13 and post synthesis thermal treatment. 14 The major in...

show abstract

“…22 The powder XRD patterns of the as synthesized sample as well as the samples heated at different temperatures are shown in Fig. 1.…”

Section: Resultsmentioning

confidence: 99%

A Na/MnO₂Primary Cell Employing Poorly Crystalline MnO₂

Kishore

Venkatesh

Munichandraiah

2015

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

Presently Li/MnO 2 is one of the widely used primary battery for a variety of applications. As the global resources for Na are plentiful in relation to those for Li, Na/MnO 2 primary battery is expected to be an economical, viable alternate to Li/MnO 2 system. But marginal inferior properties of Na/MnO 2 , which arise due to the differences in properties between Li and Na, are inevitable. In the present work, Na/MnO 2 and Li/MnO 2 laboratory scale primary cells in non-aqueous electrolytes are assembled and their electrochemical properties are studied in similar experimental conditions. The MnO 2 used for these studies is prepared from KMnO 4 and it is in amorphous state. The discharge behavior of Na/MnO 2 cell is similar to that of Li/MnO 2 cell, but with nominal voltage less by about 0.35 V, as expected. The specific capacity of amorphous MnO 2 is 300 mAh g −1 in both Na/MnO 2 and Li/MnO 2 cells. On heating the as prepared amorphous MnO 2 at temperature range 300-800 • C, it converts to crystalline α-MnO 2 . The capacity of crystalline MnO 2 is significantly less than the amorphous MnO 2 . The results suggest that Na/MnO 2 is a viable, economical alternate to Li/MnO 2 primary cell. Investigations on rechargeable batteries, in particular on lithiumbased batteries, have dominated over other battery systems in recent years because of their obvious advantage of reusability.1-5 However, primary batteries are also equally important and they are useful in a wide range of applications. These non-rechargeable batteries continue to energize applications such as watches, remote controls, toys, pacemakers, etc. Their importance is felt greater where charging is impractical, such as military combat, rescue missions, forest-fire services, etc.Among the available primary batteries, Li-based non-aqueous batteries occupy special place because of their higher energy density in relation to aqueous primary batteries.1,6-8 Li/MnO 2 batteries are more attractive because of plentiful natural resources of Mn and polymorphic properties of MnO 2 .9-12 The Li/MnO 2 primary battery is one of the first Li-based non-aqueous batteries and it is now used very widely. There are several cell configuration, which include coin, bobbin, spirally wound cylindrical, and prismatic configurations designed for low, moderate and high drain applications.1 The attractive properties include a high cell voltage (nominal voltage: 3 V), specific energy of about 280 Wh kg −1 , energy density of about 588 Wh l −1 , good performance over a wide temperature range, long shelf-life, storability at high temperature and low cost.1 The Li/MnO 2 battery is used in various applications, including long-term memory back up, cameras, consumer devices and military electronic devices. However, the natural resources of Li are limited and unevenly distributed across the globe.13,14 Development of a primary battery using a more abundant alternate anode material with properties similar to Li-based battery is a challenging task. Although Mg was exploited as an anode for primary b...

show abstract

Remarkable Capacity Retention of Nanostructured Manganese Oxide upon Cycling as an Electrode Material for Supercapacitor

Cited by 250 publications

References 51 publications

Cage-like MnO 2 -Mn 2 O 3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

Cage-like MnO 2 -Mn 2 O 3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

Macroporous MnO2 electrodes obtained by template assisted electrodeposition for electrochemical capacitors

A Na/MnO₂Primary Cell Employing Poorly Crystalline MnO₂

Contact Info

Product

Resources

About

Remarkable Capacity Retention of Nanostructured Manganese Oxide upon Cycling as an Electrode Material for Supercapacitor

Cited by 250 publications

References 51 publications

Cage-like MnO 2 -Mn 2 O 3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

Cage-like MnO 2 -Mn 2 O 3 hollow spheres with high specific capacitance and high rate capability as supercapacitor material

Macroporous MnO2 electrodes obtained by template assisted electrodeposition for electrochemical capacitors

A Na/MnO2Primary Cell Employing Poorly Crystalline MnO2

Contact Info

Product

Resources

About

A Na/MnO₂Primary Cell Employing Poorly Crystalline MnO₂