Construction of MnO2/3-dimensional porous crack Ni for high-performance supercapacitors

Xu, Guiyin; Wen, Ya; Min, Xiang-ping; Dong, Wenhao; Tang, Anping; Song, Haishen

doi:10.1016/j.electacta.2015.10.136

Cited by 40 publications

(20 citation statements)

References 41 publications

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“…[64] The remarkable enhancement in electrochemical performance is mainly attributed to the fact that the created cellular structure significantly increases the interfaces between MnO 2 and the Ni substrates, leadingt oad ecrease in the charget ransfer resistance (R ct ). The R ct valueso fM nO 2 /MPNW and MnO 2 /NW electrodes, which is relatedt ot he high-frequency semicircle, [65,66] are significantly different. The R ct valueso fM nO 2 /MPNW and MnO 2 /NW electrodes, which is relatedt ot he high-frequency semicircle, [65,66] are significantly different.…”

Section: Resultsmentioning

confidence: 93%

“…This explanation is unambiguously verified by electrochemical impedance spectroscopy (EIS) results, which were fitted by using an equivalent circuit (Figure 5h and inset). The R ct valueso fM nO 2 /MPNW and MnO 2 /NW electrodes, which is relatedt ot he high-frequency semicircle, [65,66] are significantly different. R ct of the MnO 2 /MPNW electrode wasa pproximately 8.8 W cm 2 ,w hich was one order of magnitude lower than that of the MnO 2 /NW electrode (ca.…”

Section: Resultsmentioning

confidence: 93%

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Cellular Structure Fabricated on Ni Wire by a Simple and Cost‐Effective Direct‐Flame Approach and Its Application in Fiber‐Shaped Supercapacitors

et al. 2018

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Cellular metals with the large surface/volume ratios and excellent electrical conductivity are widely applicable and have thus been studied extensively. It is highly desirable to develop a facile and cost-effective process for fabrication of porous metallic structures, and yet more so for micro/nanoporous structures. A direct-flame strategy is developed for in situ fabrication of micron-scale cellular architecture on a Ni metal precursor. The flame provides the required heat and also serves as a fuel reformer, which provides a gas mixture of H , CO, and O for redox treatment of metallic Ni. The redox processes at elevated temperatures allow fast reconstruction of the metal, leading to a cellular structure on Ni wire. This process is simple and clean and avoids the use of sacrificial materials or templates. Furthermore, nanocrystalline MnO is coated on the microporous Ni wire (MPNW) to form a supercapacitor electrode. The MnO /MPNW electrode and the corresponding fiber-shaped supercapacitor exhibit high specific capacitance and excellent cycling stability. Moreover, this work provides a novel strategy for the fabrication of cellular metals and alloys for a variety of applications, including catalysis, energy storage and conversion, and chemical sensing.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 93%

Cellular Structure Fabricated on Ni Wire by a Simple and Cost‐Effective Direct‐Flame Approach and Its Application in Fiber‐Shaped Supercapacitors

et al. 2018

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“…For example, the pore diameter of NF was in the range of hundreds of microns and the porosity could be as high as 90%, whereas the proportion of the ligament was relatively small and its diameter was ∼50 μm. Taking electrochemical electrode in solution as an example, the large pore structure in NF was indeed conducive to liquid infiltration and ion transmission (Xu et al, 2015). However, the lower active surface of ligaments became a major obstacle, limiting the electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Construction of Hierarchical Porous Architecture on Ni Foam for Efficient Oxygen Evolution Reaction Electrode

Zhao

Peng

et al. 2021

Front. Mater.

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Nickel foam (NF) with a three-dimensional porous structure plays an important role in a wide variety of applications such as energy storage and conversion, catalysis, and sensor due to its high porosity, low density, and excellent conductivity. However, the main drawback of NF is that its ligaments are very smooth, and thus the surface area is relatively low. In this work, we propose a novel strategy, oxidization and reduction process, in situ to construct micron/nano pores on the ligaments of commercial NF to fabricate a typical hierarchical porous architecture. This process is simple and green, avoiding the use of sacrificial materials. Furthermore, MnO2 is coated on the micron/nano-porous Ni foam (MPNF) to construct an oxygen evolution reaction (OER) electrode through pulse electrodeposition. The designed MPNF-MnO2 electrode presents enhanced OER electrocatalysis activity with a low overpotential of 363.5 mV at the current density of 10 mA cm−2 in an alkaline solution, which is 66.4 mV lower than that of the NF-MnO2 electrode in the same operating conditions. Furthermore, the porous and wrinkled structures of the MPNF also improve the mechanical integrity of the electrode, resulting in super-long stability.

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“…Transition metal nitrides (TMNs) have arose public concern for many electrochemical reactions due to the low cost, high conductivity, thermal stability and similar electronic structure with the noble metals. [1][2][3][4] Titanium nitride (TiN), particularly, is an amazing target that possesses superior electrical conductivity (4000-55500 S cm À 1 ), excellent electrochemical and mechanical stability, has been efficiently applied in various reactions that require noble metal catalysts, including fuel cells, [5][6][7][8][9][10][11] supercapacitors, [12][13][14][15][16][17][18][19][20] dye-sensitized solar cells, [21][22][23][24][25][26][27][28] lithium ion and lithium air batteries, [29][30][31] and so on. In addition, TiN was also widely investigated as an ideal alternative catalyst support to perishable carbon support, and the resulting catalysts exhibited improved activity and durability.…”

Section: Introductionmentioning

confidence: 99%

Engineering of Hierarchical and Three‐Dimensional Architectures Constructed by Titanium Nitride Nanowire Assemblies for Efficient Electrocatalysis

et al. 2019

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Electrocatalysts that exhibit both, high performance and durability are essential for the promotion and commercialization of energy conversion devices. Transition metal nitrides (TMNs) hold great potential in many electrochemical catalytic processes, whereas the rational syntheses of highly open and three‐dimensional titanium nitride‐based nanostructures through a facile and efficient strategy is still a challenge. Herein, a scalable and effective method is proposed for the rational synthesis of mono‐ or bi‐metallic titanium nitride with three‐dimensional urchin‐like porous structures, which exhibit high electrochemical stability and structure durability. When being used as the support, the resultant electrocatalyst possesses much higher activity and durability in oxygen reduction reaction as well as methanol oxidation reaction. This work provides a general approach for the rational design of TMN‐based electrocatalysts or devices for application in energy conversion and storage technologies.

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Construction of MnO2/3-dimensional porous crack Ni for high-performance supercapacitors

Cited by 40 publications

References 41 publications

Cellular Structure Fabricated on Ni Wire by a Simple and Cost‐Effective Direct‐Flame Approach and Its Application in Fiber‐Shaped Supercapacitors

Cellular Structure Fabricated on Ni Wire by a Simple and Cost‐Effective Direct‐Flame Approach and Its Application in Fiber‐Shaped Supercapacitors

Construction of Hierarchical Porous Architecture on Ni Foam for Efficient Oxygen Evolution Reaction Electrode

Engineering of Hierarchical and Three‐Dimensional Architectures Constructed by Titanium Nitride Nanowire Assemblies for Efficient Electrocatalysis

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