Improving ORR activity of carbon nanotubes by hydrothermal carbon deposition method

Huang, Biao; Lu, Peng; Yang, Fangfang; Liu, Yuchuan; Xie, Zailai

doi:10.1016/j.jechem.2017.03.016

Cited by 75 publications

(38 citation statements)

References 54 publications

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“…Among those candidates, the N-doped carbon material as a representative metal-free catalyst is of particular interest. [29][30][31][32][33][34][35][36][37][38][39][40] Alien nitrogen atom doped into the graphitic framework changes electronic density of carbon surface and thus favors the oxygen molecule adsorption and further reduction. [29,[41][42][43] Despite of the high activity of N-doped carbons, their performances are still far from satisfactory.…”

Section: Introductionmentioning

confidence: 99%

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

et al. 2019

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Two‐dimensional carbons synthesis through sustainable bio‐manufacturing methods has attracted much attention in the past decade. This process facilitates low cost and facile manufacturing of porous carbon materials with specific characteristics, as well as chemical functions that differ from their bulk counterparts due to the low dimensionality. Herein, a unique graphene‐like carbon framework composed of three‐dimensionally interconnected nanosheets has been successfully fabricated via carbonization of a biomass precursor guanine and colloidal silica. The obtained two‐dimensional carbon materials, consisting of carbon nanosheets with varying sizes, can provide huge exposed areas. Owing to the merits of in situ nitrogen‐doping, particularly the optimization of nitrogen species and significant improvement in porosity, the sample GHS‐1000‐2.5 delivers the outstanding electrochemical activity towards oxygen reduction reaction in both acid and alkaline conditions, which are comparable to the commercial Pt/C catalyst and show even better performance under the same conditions. This highly efficient, facile and low‐cost strategy is expected to meet the requirements for the commercialization for fuel cells.

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Section: Introductionmentioning

confidence: 99%

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

et al. 2019

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“…As shown in Table , the carbon content determined by elemental analysis (EA) is a little lower than that derived from XPS analysis because of their different measurement principles. As discussed, EA can give the accurate carbon content in the samples, which can provide important information on the carbon residue. Apparently, the carbon contents in 10N x WF‐EC are much larger than those of 10N x WF due to the carbonization of polyhydroxy compounds, which act as the physical barriers to inhibit Ni sintering.…”

Section: Resultsmentioning

confidence: 99%

WO_x‐Modified Ni Catalyst Supported on Mesoporous Silica with Extra‐Large Mesopores for CO Methanation

Yang

Liu²,

Liu

et al. 2020

Energy Tech

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A group of Ni–WOx/FDU‐12 (x < 3; FDU‐12: Fudan University ordered mesoporous materials) catalysts is prepared via a polyhydroxy compound–assisted impregnation method for carbon monoxide (CO) methanation. Ethylene glycol is used as the solvent, and citric acid is added as the second polyhydroxy compound to enhance the dispersion of Ni2+ ions. These polyhydroxy compounds are carbonized as sacrificial carbon via calcination in an inert atmosphere. Meanwhile, H2O is used as the reference solvent. These catalysts are systematically characterized by various techniques. The results show that the utilization of ethylene glycol and citric acid significantly reduces the size of Ni, and the addition of the WOx promoter further improves Ni dispersion. The optimal catalyst shows a high low‐temperature activity, which reaches thermodynamic equilibrium at only 360 °C and obtains the maximum CH4 yield of 86.2% at 400 °C due to the fine Ni particle size and enhanced hydrogen chemisorption capacity. In addition, this catalyst shows high stability in a 100 h‐lifetime test at 400 °C, 0.1 MPa, and a high weight hourly space velocity of 60 000 mL g−1 h−1. This is attributed to the synergistic effect of the WO3 promoter and the physical barrier of carbon residue, as well as the confinement effect of FDU‐12 support.

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“…For example, graphene and CNT can provide excellent electrical and mechanical properties but limited surface area and accessible pores mostly due to aggregation, whereas activated carbons offer high surface area and abundant pore volume with a well‐structured micro‐ and mesoporous network but poor electrical conductivity. These hybrid structures can be tailored during synthesis to supplement the limitations of each other . For instance, hydrothermal‐prepared CNT/carbon composites, CNT/activated carbon blends, 3D graphene‐based framework etc.…”

Section: Introductionmentioning

confidence: 99%

Multidimensional Co‐Exfoliated Activated Graphene‐Based Carbon Hybrid for Supercapacitor Electrode

2019

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Herein, a simple route for the fabrication of highly porous‐activated few‐layer graphene for application in supercapacitors as an electrode material is reported. The process makes use of natural and renewable materials, which is an essential prerequisite, especially for large‐scale application. Few‐layer graphene is exfoliated in aqueous suspension with the aid of microfibrillated cellulose (MFC), an environmentally benign eco‐friendly medium that is low‐cost, biodegradable, and sustainable. The exfoliated product is subsequently activated to increase the surface area and to form the desired pore structure. The prepared electrode materials exhibit a high surface area of up to 720 m2 g−1. MFC is also used as a nontoxic environmentally friendly binder in the electrode application. The electrochemical performance is evaluated in a three‐electrode system, and the prepared samples show a high specific capacitance of up to 120 F g−1 at a current density of 1 A g−1. The samples also exhibit a high capacity‐retention rate of about 99% after 5000 cycles and 97% after 10 000 cycles. The proposed method for the fabrication of graphene‐based supercapacitor electrode materials, based largely on renewable and sustainable materials, offers potential for commercially viable applications.

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Improving ORR activity of carbon nanotubes by hydrothermal carbon deposition method

Cited by 75 publications

References 54 publications

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

WO_x‐Modified Ni Catalyst Supported on Mesoporous Silica with Extra‐Large Mesopores for CO Methanation

Multidimensional Co‐Exfoliated Activated Graphene‐Based Carbon Hybrid for Supercapacitor Electrode

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Improving ORR activity of carbon nanotubes by hydrothermal carbon deposition method

Cited by 75 publications

References 54 publications

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

Biomass Derived Graphene‐Like Carbons for Electrocatalytic Oxygen Reduction Reaction

WOx‐Modified Ni Catalyst Supported on Mesoporous Silica with Extra‐Large Mesopores for CO Methanation

Multidimensional Co‐Exfoliated Activated Graphene‐Based Carbon Hybrid for Supercapacitor Electrode

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Product

Resources

About

WO_x‐Modified Ni Catalyst Supported on Mesoporous Silica with Extra‐Large Mesopores for CO Methanation