Synergy of Mn and Ni enhanced catalytic performance for toluene combustion over Ni-doped α-MnO2 catalysts

Dong, Yongli; Zhao, Jiayi; Zhang, Junye; Chen, Yan; Yang, Xinxin; Song, Weina; Wei, Liguo; Li, Wei

doi:10.1016/j.cej.2020.124244

Cited by 138 publications

(67 citation statements)

References 62 publications

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“…Unfortunately, in practice, Co 3 O 4 is unable to provide a very high specific capacitance compared to its theoretical value due to high internal resistance and small active surface area. Various strategies have been employed to enhance its electrochemical properties including morphological modification via simple chemical techniques and metal‐ion doping etc 30‐32 . The use of simple, low‐cost synthesis methods for the fabrication of good quality material along with porous nature is highly desirable in many applications.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to this, the metal doping into Co 3 O 4 can also increase the conductivity of a nanomaterial, which is highly beneficial for enhanced performance of supercapacitor 32‐35 . Electronic, physical and chemical characteristics of TMOs‐based materials can be significantly improved by doping with an appropriate metallic element 30‐32 . Recently, Huiyu Chen et al 13 reported that Mn‐doped Co 3 O 4 delivers improved specific capacitance, that is, 773 F/g and excellent capacitance retention.…”

Section: Introductionmentioning

confidence: 99%

“…[32][33][34][35] Electronic, physical and chemical characteristics of TMOs-based materials can be significantly improved by doping with an appropriate metallic element. [30][31][32] Recently, Huiyu Chen et al 13 reported that Mn-doped Co 3 O 4 delivers improved specific capacitance, that is, 773 F/g and excellent capacitance retention. Similarly, Shanshan Li et al 3 have reported improved electrochemical properties of Co 3 O 4 by doping with "Fe" atom, resulting in increased specific capacitance and high capacitance retention.…”

Section: Introductionmentioning

confidence: 99%

“…Various strategies have been employed to enhance its electrochemical properties including morphological modification via simple chemical techniques and metal-ion doping etc. [30][31][32] The use of simple, low-cost synthesis methods for the fabrication of good quality material along with porous nature is highly desirable in many applications. Moreover, the fabrication of material with diverse morphologies such as nanocubes, nanoflowers, nanorods, nanoboxes, nanosheets, nanodiscs etc.…”

Section: Introductionmentioning

confidence: 99%

“…30 Both the transfer rate of ions during the storage process of charges and interface properties of the material with electrolyte vary due to morphology of nanomaterial. 31 In addition to this, the metal doping into Co 3 O 4 can also increase the conductivity of a nanomaterial, which is highly beneficial for enhanced performance of supercapacitor. [32][33][34][35] Electronic, physical and chemical characteristics of TMOs-based materials can be significantly improved by doping with an appropriate metallic element.…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

et al. 2020

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Summary In this work, cerium was doped in various concentrations ranging from 1.0 to 7.0 at. % by means of a facile hydrothermal synthesis route with an intention to improve the capacitive properties of Co3O4. X‐ray powder diffraction (XRD), scanning electron microscopy coupled with energy dispersive X‐ray spectroscopy (EDX) and HRTEM were employed to study the structural characteristics, morphology, elemental constitution and d‐spacing of the synthesized material. The capacitive characteristics were analyzed through cyclic voltammetry (CV), galvanostatic charge‐discharge (GCD) test and electrochemical impedance spectroscopy (EIS). Materials characterizations revealed the formation of pristine and Ce‐doped Co3O4 nanoflakes, and their average size was in the range of 45 to 55 nm and possessing excellent elemental purity. The CV test showed that 5.0 at. % Ce‐doped Co3O4 nanoflakes deliver outstanding specific capacitance, that is, 1309.6 F/g and excellent cyclic stability of 90.86% after 2000 CV cycles at a scan rate 5 mV/s. The GCD test at 1‐10 A/g showed excellent rate capability, that is, 82.87% at high current density of 10 A/g. The EIS test revealed excellent electrical conductivity of the material. Experimental results suggest that Ce‐doped Co3O4 has an outstanding potential for use in energy storage devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

et al. 2020

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MnO₂‐Based Materials for Environmental Applications

et al. 2021

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Manganese dioxide (MnO2) is a promising photo–thermo–electric‐responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2‐based composites via the construction of homojunctions and MnO2/semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2‐based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high‐efficiency MnO2‐based materials for comprehensive environmental applications is provided.

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Tailoring the Electronic Metal‐Support Interactions in Supported Silver Catalysts through Al modification for Efficient Ethylene Epoxidation

Yang,

Li,

Liu

et al. 2024

Angewandte Chemie

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Metal‐modified catalysts have attracted extraordinary research attention in heterogeneous catalysis due to their enhanced geometric and electronic structures and outstanding catalytic performances. Silver (Ag) possesses necessary active sites for ethylene epoxidation, but the catalyst activity is usually sacrificed to obtain high selectivity towards ethylene oxide (EO). Herein, we report that using Al can help in tailoring the unoccupied 3d state of Ag on the MnO2 support through strong electronic metal‐support interactions (EMSIs), overcoming the activity‐selectivity trade‐off for ethylene epoxidation and resulting in a very high ethylene conversion rate (~100%) with 90% selectivity for EO under mild conditions (170 oC and atmospheric pressure). Structural characterization and theoretical calculations revealed that the EMSIs obtained by the Al modification tailor the unoccupied 3d state of Ag, modulating the adsorption of ethylene (C2H4) and oxygen (O2) and facilitating EO desorption, resulting in high C2H4 conversion. Meanwhile, the increased number of positively charge Ag+ lowers the energy barrier for C2H4(ads) oxidation to produce oxametallacycle (OMC), inducing the unexpectedly high EO selectivity. Such an extraordinary electronic promotion provides new promising pathways for designing advanced metal catalysts with high activity and selectivity in selective oxidation reactions.

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Synergy of Mn and Ni enhanced catalytic performance for toluene combustion over Ni-doped α-MnO2 catalysts

Cited by 138 publications

References 62 publications

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

MnO₂‐Based Materials for Environmental Applications

Tailoring the Electronic Metal‐Support Interactions in Supported Silver Catalysts through Al modification for Efficient Ethylene Epoxidation

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Synergy of Mn and Ni enhanced catalytic performance for toluene combustion over Ni-doped α-MnO2 catalysts

Cited by 138 publications

References 62 publications

Hydrothermal synthesis of cerium‐doped Co 3 O 4 nanoflakes as electrode for supercapacitor application

Hydrothermal synthesis of cerium‐doped Co 3 O 4 nanoflakes as electrode for supercapacitor application

MnO2‐Based Materials for Environmental Applications

Tailoring the Electronic Metal‐Support Interactions in Supported Silver Catalysts through Al modification for Efficient Ethylene Epoxidation

Contact Info

Product

Resources

About

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

Hydrothermal synthesis of cerium‐doped Co ₃ O ₄ nanoflakes as electrode for supercapacitor application

MnO₂‐Based Materials for Environmental Applications