Nitrogen-doped carbon microfibers with porous textures

Fan, Yanru; Zhao, Zongbin; Zhou, Qiugui; Li, Guodong; Wang, Xuzhen; Qiu, Jieshan; Gogotsi, Yury

doi:10.1016/j.carbon.2013.02.040

Cited by 33 publications

(16 citation statements)

References 37 publications

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“…Carbon fibers (CFs) are of great interest for EC applications, as they are inexpensive and massively synthesized by various methods (e.g.,electrospinning and vapor growth) with variable fiber diameters, porosities, and surfacec hemistries. [11,[253][254][255][256][257] Similar to CNTs, CFs possess ah igh surface area to volume ratio, good electrical conductivity,a nd good flexibility.T he pore size and SSA of CFs can be controlled through physical or chemicala ctivation. [126] Our group reported the preparation of PAN-based CNF paper through electrospinning,f ollowed by one-step carbonization/activation under aC O 2 atmosphere at temperatures from 700 to 1000 8C.…”

Section: Carbonfibers For Ecsmentioning

confidence: 99%

Carbon‐Based Materials for Lithium‐Ion Batteries, Electrochemical Capacitors, and Their Hybrid Devices

2015

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A rapidly developing market for portable electronic devices and hybrid electrical vehicles requires an urgent supply of mature energy-storage systems. As a result, lithium-ion batteries and electrochemical capacitors have lately attracted broad attention. Nevertheless, it is well known that both devices have their own drawbacks. With the fast development of nanoscience and nanotechnology, various structures and materials have been proposed to overcome the deficiencies of both devices to improve their electrochemical performance further. In this Review, electrochemical storage mechanisms based on carbon materials for both lithium-ion batteries and electrochemical capacitors are introduced. Non-faradic processes (electric double-layer capacitance) and faradic reactions (pseudocapacitance and intercalation) are generally explained. Electrochemical performance based on different types of electrolytes is briefly reviewed. Furthermore, impedance behavior based on Nyquist plots is discussed. We demonstrate the influence of cell conductivity, electrode/electrolyte interface, and ion diffusion on impedance performance. We illustrate that relaxation time, which is closely related to ion diffusion, can be extracted from Nyquist plots and compared between lithium-ion batteries and electrochemical capacitors. Finally, recent progress in the design of anodes for lithium-ion batteries, electrochemical capacitors, and their hybrid devices based on carbonaceous materials are reviewed. Challenges and future perspectives are further discussed.

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Section: Carbonfibers For Ecsmentioning

confidence: 99%

Carbon‐Based Materials for Lithium‐Ion Batteries, Electrochemical Capacitors, and Their Hybrid Devices

2015

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“…The introduction of azobisformamide doesn't change the decomposition reaction of Mg(OH) 2 . And after the remove of template, the sample shows the (002) reflection from graphite but with a relatively low intensity because more nitrogen atoms have been incorporated into carbon network [23]. The increase of nitrogen-doping amount also leads to more defects or higher disorder degree which reflects in the increase of I D /I G value (from 3.77 to 4.30) [22].…”

Section: Resultsmentioning

confidence: 98%

“…The carbon-1:1:1 sample always delivers higher specific capacitance than that of carbon-1:1 sample regardless of the current density. The enhancement of specific capacitance can be attributed to improved pseudocapacitance, surface chemical activity and conductivity induced by the nitrogen dopant [23,33] Considering that long-term cycling behavior is also essential for the practical application of supercapacitor, the cycling stability was analyzed by galvanostatic charge-discharge technique at a current density of 10 A g À1 . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A simple Mg(OH)2-assisted template carbonization method to N-doped nanoporous carbon material from phenidone and the capacitive improvement with the addition of azobisformamide

Zhu

Chen

et al. 2015

Electrochimica Acta

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“…29 Simultaneously generated carbon nitride gases (e.g., C2N2 + , C3N2 + , C3N3 + ) from melamine will dissolve in these 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 12 nanoparticles. 39 After super saturation of these feed gases in the nanoparticles, precipitation of carbon occurs under the thermal treatment conditions and this in turn results in the initiation of the nanotube growth catalyzed by the iron particle, a mechanism which is nearly similar to the one as suggested by Gagotsi et al 40 From Figure 4, it is clear that the nanohorn plays a pivotal role in maintaining the concentration of the carbon nitride feed gas from melamine to initiate the tubular growth from the nanohorn. This ultimately leads to reduction in the thickness of the wall of the nanotubes and improvement in the surface area of the nanotubes.…”

Section: Preparation Of Nitrogen Doped Nanohorn (Ncnh)mentioning

confidence: 86%

Carbon Nanohorn-Derived Graphene Nanotubes as a Platinum-Free Fuel Cell Cathode

Unni

Illathvalappil

Bhange

et al. 2015

ACS Appl. Mater. Interfaces

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Current low-temperature fuel cell research mainly focuses on the development of efficient nonprecious electrocatalysts for the reduction of dioxygen molecule due to the reasons like exorbitant cost and scarcity of the current state-of-the-art Pt-based catalysts. As a potential alternative to such costly electrocatalysts, we report here the preparation of an efficient graphene nanotube based oxygen reduction electrocatalyst which has been derived from single walled nanohorns, comprising a thin layer of graphene nanotubes and encapsulated iron oxide nanoparticles (FeGNT). FeGNT shows a surface area of 750 m(2)/g, which is the highest ever reported among the metal encapsulated nanotubes. Moreover, the graphene protected iron oxide nanoparticles assist the system to attain efficient distribution of Fe-Nx and quaternary nitrogen based active reaction centers, which provides better activity and stability toward the oxygen reduction reaction (ORR) in acidic as well as alkaline conditions. Single cell performance of a proton exchange membrane fuel cell by using FeGNT as the cathode catalyst delivered a maximum power density of 200 mW cm(-2) with Nafion as the proton exchange membrane at 60 °C. The facile synthesis strategy with iron oxide encapsulated graphitic carbon morphology opens up a new horizon of hope toward developing Pt-free fuel cells and metal-air batteries along with its applicability in other energy conversion and storage devices.

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Nitrogen-doped carbon microfibers with porous textures

Cited by 33 publications

References 37 publications

Carbon‐Based Materials for Lithium‐Ion Batteries, Electrochemical Capacitors, and Their Hybrid Devices

Carbon‐Based Materials for Lithium‐Ion Batteries, Electrochemical Capacitors, and Their Hybrid Devices

A simple Mg(OH)2-assisted template carbonization method to N-doped nanoporous carbon material from phenidone and the capacitive improvement with the addition of azobisformamide

Carbon Nanohorn-Derived Graphene Nanotubes as a Platinum-Free Fuel Cell Cathode

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