Incorporation of RuO2 into charcoal-derived carbon with controllable microporosity by CO2 activation for high-performance supercapacitor

Zhang, Yifan; Park, Soo‐Jin

doi:10.1016/j.carbon.2017.06.085

Cited by 211 publications

(79 citation statements)

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“…In the recent past, to address the poor cycle stability of metal oxides and the low capacitance of carbon‐based materials, RuO 2 composites based on KOH and CO 2 activated charcoal‐derived activated carbons obtained via hydrothermal method was carried out. The resultant 3D‐ controlled microporous composite exhibited efficient electron transport properties and more exposure to redox active sites that enhanced the supercapacitor performance . Investigations on Ta‐electrode coated with RuO 2 /activated carbon composite, prepared by modified colloidal process followed by thermal treatment showed drastic influence of annealing temperatures on the specific capacitances due to grain size effect .…”

Section: Ruo2‐based Nanocomposites and Their Electrochemical Featuresmentioning

confidence: 99%

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

Majumdar¹,

Maiyalagan

Jiang³

2019

ChemElectroChem

252

147

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Electrochemical energy storage has emerged as one of the principal topics of present‐day research to deal with the high energy demands of modern society. Accordingly, besides fuel cells and battery technologies, interesting and challenging results have been observed in the recent past, during the materialization of “supercapacitors” or “ultracapacitors”, which have provoked a sharp increase in research inclination to revisit this aspect of renewable and sustainable energy storage. Supercapacitor performances are largely dependent on electrode materials, the nature of the electrolyte used, and the range of voltage windows employed. Carbon‐based electrode materials have tunable properties such as electrical conductivity, extensive surface area, and faster electron transfer kinetics with low fabrication costs. But their specific capacitances are found to be too low for commercialization. Ruthenium dioxide (RuO2), owing to its high theoretical specific capacitance value (1400–2000 F g−1), has been extensively recognized as a favorable material for supercapacitor devices, but high production cost and agglomeration effects stand as high barriers preventing marketable usage. Consequently, RuO2‐based nanocomposites have been widely studied to optimize the material cost, with simultaneous improvement in the electrochemical performances. This Review describes comprehensively the recent progress in terms of the fabrication and design, electrochemical performance, and achievements of RuO2 and its nanocomposites as electrode materials for supercapacitors, which will be beneficial for further research designing high‐performance supercapacitor devices.

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Section: Ruo2‐based Nanocomposites and Their Electrochemical Featuresmentioning

confidence: 99%

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

Majumdar¹,

Maiyalagan

Jiang³

2019

ChemElectroChem

252

147

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“…CuO@Cu 3 (BTC) 2 processed a relative large SSA of 75.8 m 2 /g, more than 6 times higher than that of CuO sample, suggesting that Cu 3 (BTC) 2 on the shell could increase the SSA of CuO@Cu 3 (BTC) 2 core‐shell material. The large specific surface area could supply more active sites and thus benefited the catalytic activity ,…”

Section: Methodsmentioning

confidence: 99%

In situ Growth Synthesis of CuO@Cu‐MOFs Core‐shell Materials as Novel Low‐temperature NH₃‐SCR Catalysts

Chen

et al. 2019

ChemCatChem

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Metal oxides@MOFs core-shell materials were developed for selective catalytic reduction of NO x by NH 3 (NH 3 -SCR). A novel CuO@Cu-MOFs core-shell material with CuO as the core and Cu 3 (BTC) 2 as the shell were rationally designed and synthesized by an in situ growth method and used in NH 3 -SCR reaction. The prepared CuO@Cu-MOFs materials combined physicochemical properties of CuO (high NO adsorption stability and excellent surface reducibility) and Cu 3 (BTC) 2 (large specific surface area and abundant acid sites). In addition, the core-shell materials held large amounts of Brønsted acid sites and abundant adsorbed NO x intermediate species, which benefited NH 3 -SCR reaction under low-temperature. Experimental results demonstrated that CuO@Cu-MOFs possessed higher low-temperature catalytic activity than that of pure CuO and Cu 3 (BTC) 2 . Importantly, CuO@Cu-MOFs performed satisfied stability in NH 3 -SCR reaction, which made it to be a potential and promising low-temperature SCR catalyst.Selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) is one of the most popular methods to eliminate NO x from stationary sources. [1][2][3] V 2 O 5 -WO 3 /TiO 2 materials with high catalytic activity in temperature range of 300-400°C have been successfully used in coal-fired power plants for decades. However, the activate temperature of commercial V 2 O 5 -WO 3 /TiO 2 catalysts is too high in comparison to effluent temperature of cement factory, steel manufacturing, and other stationary sources. [4,5] As such, the efficient SCR catalysts which own high activity under low temperatures are highly desired. [6][7][8] Up to now, considerable attention has been focused on transition metal oxides such as Mn-, Ce-, Cu-, and Fe-based materials which demonstrate high activity in NH 3 -SCR at low temperatures; however, the low tolerance to SO 2 limits the application of these metal oxide catalysts in industry. [9][10][11][12] As a consequence, the development of low-temperature catalysts with superior NH 3 -SCR activity and high SO 2 tolerance is a hot topic in NH 3 -SCR.Metal-organic frameworks (MOFs) as newly emerging materials are important and potential materials in heterogeneous catalytic reactions due to their large specific surface areas, high structural diversity, tunable chemical properties, and highly dispersed metal sites. [13] MOFs have been used as new SCR catalysts by a few groups and are thought to be potential alternatives for commercial SCR catalysts. [14] Researchers have found that MIL-100(Fe), [13] Mn-MOF-74, [16] Co/Mn-MOF-74, [17] and Cu-MOF-74 [18] could perform higher activity than that of V 2 O 5 -WO 3 /TiO 2 catalysts at low temperatures (< 200°C). However, the synthesis procedure of MOFs is rather complicated with high energy consumption and the low-temperature SCR activity of MOFs still needs to be improved.A promising approach to enhance the catalytic performance of MOFs is to fabricate the MOFs into core-shell architecture. Recently, metal oxides@MOFs core-shell materials have been used in various c...

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“…[5] Generally, two kinds of traditional electrode materials are extensively studied: one is a carbon-based material with capacitive behavior (e. g. activated carbon, [6] porous carbon, [7] reduced graphene oxide, [8] etc.) and the other is transition metal oxides (TMOs) and conducting polymers with pseudocapacitive behavior (e. g. Ruthenium oxide, [9] manganese dioxide, [10] nickel oxide, [11] polypyrrole, [12] etc.). In recent times, such as MnCo 2 O 4 , ZnFe 2 O 4 , Ni 3 V 2 O 8 and NiMoO 4 , binary transition metal oxides (BTMOs) have gradually entered the field of view of researchers as pseudocapacitive electrode materials for SCs.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of NiCo₂O₄/CoMoO₄ Nanocomposite as a High‐Performance Electrode Material for Hybrid Supercapacitors

Guo

Tian

et al. 2019

ChemElectroChem

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The hierarchical hollow NiCo2O4/CoMoO4 hybrid composite was directly grown on Ni foam (NF) under hydrothermal conditions at 110–140 °C for different growth times. This robust hollow structure benefits from a weakly alkaline environment provided by tetramethyl ammonium hydroxide and can provide a large surface area, low resistance, and many active sites to facilitate electrolyte ion transport and fast redox reactions. The as‐prepared NiCo2O4/CoMoO4 hybrid with synergetic effects shows improved electrochemical properties with an excellent capacitance (2080 F/g at 1 A/g) and long‐term cycling reliability (70 % retention undergoing 3000 cycles at 10 A/g). An assembled hybrid supercapacitor based on the as‐prepared NiCo2O4/CoMoO4 hybrid electrode delivers a high energy density of 35.63 Wh/kg at a power density of 845 W/kg and a long‐term cycling life (capacitance retention of 71.4 % over 9000 cycles). Thus, the as‐prepared NiCo2O4/CoMoO4 nanocomposite has a definite advantage for supercapacitor electrode materials.

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Incorporation of RuO2 into charcoal-derived carbon with controllable microporosity by CO2 activation for high-performance supercapacitor

Cited by 211 publications

References 50 publications

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

In situ Growth Synthesis of CuO@Cu‐MOFs Core‐shell Materials as Novel Low‐temperature NH₃‐SCR Catalysts

Hydrothermal Synthesis of NiCo₂O₄/CoMoO₄ Nanocomposite as a High‐Performance Electrode Material for Hybrid Supercapacitors

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Incorporation of RuO2 into charcoal-derived carbon with controllable microporosity by CO2 activation for high-performance supercapacitor

Cited by 211 publications

References 50 publications

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

Recent Progress in Ruthenium Oxide‐Based Composites for Supercapacitor Applications

In situ Growth Synthesis of CuO@Cu‐MOFs Core‐shell Materials as Novel Low‐temperature NH3‐SCR Catalysts

Hydrothermal Synthesis of NiCo2O4/CoMoO4 Nanocomposite as a High‐Performance Electrode Material for Hybrid Supercapacitors

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Product

Resources

About

In situ Growth Synthesis of CuO@Cu‐MOFs Core‐shell Materials as Novel Low‐temperature NH₃‐SCR Catalysts

Hydrothermal Synthesis of NiCo₂O₄/CoMoO₄ Nanocomposite as a High‐Performance Electrode Material for Hybrid Supercapacitors