Effect of iron particle addition on the pseudocapacitive performance of sol–gel derived manganese oxides film

Chen, Chien Chon; Tsay, Chien Yie; Lin, Horng Siang; Jheng, Wern Dare; Lin, Chung Kwei

doi:10.1016/j.matchemphys.2012.09.047

Cited by 9 publications

(3 citation statements)

References 16 publications

(9 reference statements)

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“…Figure a shows CV curves of the typical Fe 3 O 4 –MnO 2 composites in Na 2 SO 4 solution at various scan rates. The rectangularity of the curves reveals that the electrochemical capacitances are mainly associated with Faradaic pseudocapacitance . The area of the CV curve increases with the scan rate.…”

Section: Resultsmentioning

confidence: 91%

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Hierarchically Porous MnO₂ Microspheres Doped with Homogeneously Distributed Fe₃O₄ Nanoparticles for Supercapacitors

Zhu

Tang

Xie

et al. 2014

ACS Appl. Mater. Interfaces

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Hierarchically porous yet densely packed MnO2 microspheres doped with Fe3O4 nanoparticles are synthesized via a one-step and low-cost ultrasound assisted method. The scalable synthesis is based on Fe(2+) and ultrasound assisted nucleation and growth at a constant temperature in a range of 25-70 °C. Single-crystalline Fe3O4 particles of 3-5 nm in diameter are homogeneously distributed throughout the spheres and none are on the surface. A systematic optimization of reaction parameters results in isolated, porous, and uniform Fe3O4-MnO2 composite spheres. The spheres' average diameter is dependent on the temperature, and thus is controllable in a range of 0.7-1.28 μm. The involved growth mechanism is discussed. The specific capacitance is optimized at an Fe/Mn atomic ratio of r = 0.075 to be 448 F/g at a scan rate of 5 mV/s, which is nearly 1.5 times that of the extremely high reported value for MnO2 nanostructures (309 F/g). Especially, such a structure allows significantly improved stability at high charging rates. The composite has a capacitance of 367.4 F/g at a high scan rate of 100 mV/s, which is 82% of that at 5 mV/s. Also, it has an excellent cycling performance with a capacitance retention of 76% after 5000 charge/discharge cycles at 5 A/g.

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Section: Resultsmentioning

confidence: 91%

“…The rectangularity of the curves reveals that the electrochemical capacitances are mainly associated with Faradaic pseudocapacitance. 31 The area of the CV curve increases with the scan rate. between Fe 2+ and Fe 3+ accompanied by intercalation of sulfate ions balance the extra charge with the iron oxide layers (2).…”

Section: Resultsmentioning

confidence: 98%

Hierarchically Porous MnO₂ Microspheres Doped with Homogeneously Distributed Fe₃O₄ Nanoparticles for Supercapacitors

Zhu

Tang

Xie

et al. 2014

ACS Appl. Mater. Interfaces

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“…Supercapacitors (SCs) are a promising class of energy storage device drawing much attention owing to their fast charge and discharge rates, high power density, and long cycle lifetimes [1][2][3]. The performance of SCs is mainly determined by electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Optimized spherical manganese oxide-ferroferric oxide-tin oxide ternary composites as advanced electrode materials for supercapacitors

Zhu¹,

Tang²,

Vongehr³

et al. 2015

Nanotechnology

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Inexpensive MnO2 is a promising material for supercapacitors (SCs), but its application is limited by poor electrical conductivity and low specific surface area. We design and fabricate hierarchical MnO2-based ternary composite nanostructures showing superior electrochemical performance via doping with electrochemically active Fe3O4 in the interior and electrically conductive SnO2 nanoparticles in the surface layer. Optimization composition results in a MnO2-Fe3O4-SnO2 composite electrode material with 5.9 wt.% Fe3O4 and 5.3 wt.% SnO2, leading to a high specific areal capacitance of 1.12 F cm(-2) at a scan rate of 5 mV s(-1). This is two to three times the values for MnO2-based binary nanostructures at the same scan rate. The low amount of SnO2 almost doubles the capacitance of porous MnO2-Fe3O4 (before SnO2 addition), which is attributed to an improved conductivity and remaining porosity. In addition, the optimal ternary composite has a good rate capability and an excellent cycling performance with stable capacitance retention of ~90% after 5000 charge/discharge cycles at 7.5 mA cm(-2). All-solid-state SCs are assembled with such electrodes using polyvinyl alcohol/Na2SO4 electrolyte. An integrated device made by connecting two identical SCs in series can power a light-emitting diode indicator for more than 10 min.

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Facile Synthesis of MnO₂/Ti₃C₂T_x/CC as Positive Electrode of All‐Solid‐State Flexible Asymmetric Supercapacitor

et al. 2020

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The pseudo‐capacitance material Manganese dioxide (MnO2) is widely used as electrode materials for supercapacitors; however, its poor electrical conductivity hinders the realization of high specific capacitance. Herein, the MnO2 and Ti3C2Tx (MXene) were deposited on carbon cloth (CC) by a facile two‐step electrodeposition method for synthesizing free‐binder MnO2/Ti3C2Tx/CC composite electrode. Benefiting from the excellent conductivity of Ti3C2Tx and the excellent pseudo‐capacitance performance of MnO2, the as‐obtained composite electrode exhibited a higher specific capacitance (411.5 F g−1 at the current density of 1 A g−1). In addition, all‐solid‐state flexible asymmetric supercapacitors were successfully assembled from the positive electrode of MnO2/Ti3C2Tx/CC and the negative electrode of Ti3C2Tx/CC. The as‐assembled supercapacitor presented a large operating voltage of 1.7 V, a high energy density of 24.3 Wh Kg−1 at a power density of 850 W Kg−1. This work provides a simple and efficient approach to prepare composite electrodes and fabricate all‐solid‐state asymmetric supercapacitors with high electrochemical performances.

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Effect of iron particle addition on the pseudocapacitive performance of sol–gel derived manganese oxides film

Cited by 9 publications

References 16 publications

Hierarchically Porous MnO₂ Microspheres Doped with Homogeneously Distributed Fe₃O₄ Nanoparticles for Supercapacitors

Hierarchically Porous MnO₂ Microspheres Doped with Homogeneously Distributed Fe₃O₄ Nanoparticles for Supercapacitors

Optimized spherical manganese oxide-ferroferric oxide-tin oxide ternary composites as advanced electrode materials for supercapacitors

Facile Synthesis of MnO₂/Ti₃C₂T_x/CC as Positive Electrode of All‐Solid‐State Flexible Asymmetric Supercapacitor

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Effect of iron particle addition on the pseudocapacitive performance of sol–gel derived manganese oxides film

Cited by 9 publications

References 16 publications

Hierarchically Porous MnO2 Microspheres Doped with Homogeneously Distributed Fe3O4 Nanoparticles for Supercapacitors

Hierarchically Porous MnO2 Microspheres Doped with Homogeneously Distributed Fe3O4 Nanoparticles for Supercapacitors

Optimized spherical manganese oxide-ferroferric oxide-tin oxide ternary composites as advanced electrode materials for supercapacitors

Facile Synthesis of MnO2/Ti3C2Tx/CC as Positive Electrode of All‐Solid‐State Flexible Asymmetric Supercapacitor

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Hierarchically Porous MnO₂ Microspheres Doped with Homogeneously Distributed Fe₃O₄ Nanoparticles for Supercapacitors

Hierarchically Porous MnO₂ Microspheres Doped with Homogeneously Distributed Fe₃O₄ Nanoparticles for Supercapacitors

Facile Synthesis of MnO₂/Ti₃C₂T_x/CC as Positive Electrode of All‐Solid‐State Flexible Asymmetric Supercapacitor