In situ Mn K-edge X-ray absorption spectroscopic studies of anodically deposited manganese oxide with relevance to supercapacitor applications

Chang, Jeng‐Kuei; Lee, Ming‐Tsung; Tsai, Wen‐Ta

doi:10.1016/j.jpowsour.2007.01.036

Cited by 127 publications

(93 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…), from the electrolyte. 31,32,33,34 The same argument applies to the RuO 2 electrode where proton insertion is the main cause of pseudocapacitance, concomitant with a change in Ru oxidation state over the potential window. 35,36 There are now more than 300 papers that describe Ni-based electrodes as pseudocapacitive, which, as presented above, does not follow the intended definition of the pseudocapacitance term.…”

Section: Ni(oh)mentioning

confidence: 87%

To Be or Not To Be Pseudocapacitive?

Brousse

Bélanger

Long

2015

J. Electrochem. Soc.

2,234

1,107

View full text Add to dashboard Cite

There are an increasing number of studies regarding active electrode materials that undergo faradaic reactions but are used for electrochemical capacitor applications. Unfortunately, some of these materials are described as "pseudocapacitive" materials despite the fact that their electrochemical signature (e.g., cyclic voltammogram and charge/discharge curve) is analogous to that of a "battery" material, as commonly observed for Ni(OH) 2 and cobalt oxides in KOH electrolyte. Conversely, true pseudocapacitive electrode materials such as MnO 2 display electrochemical behavior typical of that observed for a capacitive carbon electrode. The difference between these two classes of materials will be explained, and we demonstrate why it is inappropriate to describe nickel oxide or hydroxide and cobalt oxide/hydroxide as pseudocapacitive electrode materials.

show abstract

Section: Ni(oh)mentioning

confidence: 87%

To Be or Not To Be Pseudocapacitive?

Brousse

Bélanger

Long

2015

J. Electrochem. Soc.

2,234

1,107

View full text Add to dashboard Cite

show abstract

“…113 For ternary oxides such as the perovskite LaMnO3, DFT has assessed the relative stability of different terminations of the (001) The valence state of Mn has been shown experimentally to change as a function of ORR potential. [115][116][117] In situ evaluation of catalysts with hard X-ray absorption spectroscopy at the Mn Figure 6B), 115 where disordered Mn3O4 was detected in operando by the XAS fine structure, displaying reduced peak intensity compared to the crystalline reference. 115 The facile reduction of these Mn…”

Section: Toward Understanding Of Manganese Oxide Surfaces During the Orrmentioning

confidence: 99%

Recent Insights into Manganese Oxides in Catalyzing Oxygen Reduction Kinetics

et al. 2015

View full text Add to dashboard Cite

The sluggish kinetics of the oxygen reduction reaction (ORR) limit the efficiency of numerous oxygen-based energy conversion devices such as fuel cells and metal-air batteries. Among earth abundant catalysts, manganese-based oxides have the highest activities approaching that of precious metals. In this Review, we summarize and analyze literature findings to highlight key parameters that influence the catalysis of the ORR on manganese-based oxides, including the number of electrons transferred, specific and mass activities. These insights can help develop design guides for highly active ORR catalysts, and shape future fundamental research to gain new knowledge regarding the molecular mechanism of ORR catalysis.2

show abstract

“…5,6,25) This improvement in charge/ discharge behavior in porous-structured electrodes can be attributed to three major factors: (i) the high porosity increases OH transport, promoting ionic conduction within the electrode (ii) the largely dispersed Mn oxide shortens the electron travelling distance, within the material improving the electronic conduction, and (iii) the high contact area between the substrate and the electro-active material minimizes the interfacial resistance, facilitating charge transfer. 9 presents the repeated cycles of charge-discharge in the time span of 2500 s. No shape and size changes were observed pointing to the reversibility as well as the stability of the system.…”

Section: )mentioning

confidence: 99%

“…Owing to the fast, continuous, and reversible redox reaction of Mn oxide, pseudocapacitive behavior of Mn oxide electrode can be realized. [2][3][4] Since the capacitance of Mn oxide is associated with the reversible faradaic reaction between its trivalent and tetravalent states, [3][4][5] the theoretical specific capacitance of MnO 2 should be around 1380 F g −1 . 4) However, both poor electronic and ionic conductivity of Mn oxide prevent approaching the ideal electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposited Nano-flakes of Manganese Oxide on Macroporous Ni Electrode Exhibiting High Pseudocapacitance

Gobal¹,

Jafarzadeh²

2012

Journal of Electrochemical Science and Technology

View full text Add to dashboard Cite

:A porous nickel (P-Ni) substrate was prepared by selective leaching of zinc from pressed pellets containing powders of Ni & Zn in 4 M NaOH solution. Anodic deposition of manganese oxide onto the porous Ni substrate (MnO x /P-Ni) formed nano-flakes of manganese oxide layers as revealed in SEM studies. Pseudocapacitance of this oxide electrode was evaluated by cyclic voltammetry (CV) and chronopotentiometry (CHP) in 2 M NaOH solution. The specific capacitance of the Mn oxide electrode was as high as 1515 F g −1 , which was ten times higher than Mn oxide deposited on a flat Ni-ribbon. 80% of capacity was retained after 200 charge/discharge cycles. The system showed no loss of activity in dry form over period of days. The impedance studies indicated highly conducting MnO x /P-Ni substance and the obtained specific capacitance from impedance data showed good agreement with the charge/discharge measurements.

show abstract

In situ Mn K-edge X-ray absorption spectroscopic studies of anodically deposited manganese oxide with relevance to supercapacitor applications

Cited by 127 publications

References 25 publications

To Be or Not To Be Pseudocapacitive?

To Be or Not To Be Pseudocapacitive?

Recent Insights into Manganese Oxides in Catalyzing Oxygen Reduction Kinetics

Electrodeposited Nano-flakes of Manganese Oxide on Macroporous Ni Electrode Exhibiting High Pseudocapacitance

Contact Info

Product

Resources

About