Improved electrocatalytic activity of carbon materials by nitrogen doping

Zahoor, Awan; Christy, Maria; Hwang, Yun Ju; Lim, Yi Rang; Kim, Pil; Nahm, Kee Suk

doi:10.1016/j.apcatb.2013.09.043

Cited by 124 publications

(57 citation statements)

References 60 publications

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“…A very small peak near 1700 cm -1 is assigned to the C=O stretching vibrations of ketones, aldehydes, lactones or carboxyl groups. The weak intensity of this peak indicates that this sample contains a small amount of carboxyl groups [53]. The band at 1599 cm -1 indicates the presence of (C-H, -C=C-and aromatic C=C) groups [54].…”

Section: Adsorption Of Methyl Orange By the Synthesized Activated Carbonmentioning

confidence: 99%

“…The relatively wide band at 2344 cm -1 may either correspond to the symmetric (NH 3 + ) stretching frequency [52] or to the carbon-oxygen bonds in the ketene groups [50]. Another relatively broad peak at ~2100 cm -1 is attributed to the allene (C=C=C) group [53]. A very small peak near 1700 cm -1 is assigned to the C=O stretching vibrations of ketones, aldehydes, lactones or carboxyl groups.…”

Section: Adsorption Of Methyl Orange By the Synthesized Activated Carbonmentioning

confidence: 99%

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Adsorption capability of activated carbon synthesized from coconut shell

Islam¹,

Ang²,

Gharehkhani³

et al. 2016

Carbon letters

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Activated carbon was synthesized from coconut shells. The Brunauer, Emmett and Teller surface area of the synthesized activated carbon was found to be 1640 m 2 /g with a pore volume of 1.032 cm 3 /g. The average pore diameter of the activated carbon was found to be 2.52 nm. By applying the size-strain plot method to the X-ray diffraction data, the crystallite size and the crystal strain was determined to be 42.46 nm and 0.000489897, respectively, which indicate a perfect crystallite structure. The field emission scanning electron microscopy image showed the presence of well-developed pores on the surface of the activated carbon. The presence of important functional groups was shown by the Fourier transform infrared spectroscopy spectrum. The adsorption of methyl orange onto the activated carbon reached 100% after 12 min. Kinetic analysis indicated that the adsorption of methyl orange solution by the activated carbon followed a pseudo-second-order kinetic mechanism (R 2 > 0.995). Therefore, the results show that the produced activated carbon can be used as a proper adsorbent for dye containing effluents.

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Section: Adsorption Of Methyl Orange By the Synthesized Activated Carbonmentioning

confidence: 99%

Section: Adsorption Of Methyl Orange By the Synthesized Activated Carbonmentioning

confidence: 99%

Adsorption capability of activated carbon synthesized from coconut shell

Islam¹,

Ang²,

Gharehkhani³

et al. 2016

Carbon letters

View full text Add to dashboard Cite

show abstract

“…The phenomenon was the same for HNO3 treatment as shown in Fig.2 (b). The peak at 2350 cm -1 was attributed to stretching vibration of isonitrile C≡N cyano terminal groups [27][28]. According to the change trend of the group, NaOH and HNO3 treatment could effectively deal with the C≡N cyano terminal groups.…”

Section: Ftir Experimentsmentioning

confidence: 97%

Low temperature SCR of NO with catalysts prepared by modified ACF loading Mn and Ce: effects of modification method

Zhai

et al. 2015

Environmental Technology

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Achievement of a higher NOx conversion ratio in selective catalytic reduction (SCR) at low temperature is challenging. In this work, pure activated carbon fibres (ACFs) were modified with different ratios of H2O (g), NaOH, CO2 and HNO3, respectively (named as modified ACF). The chemical and physical properties of modified ACFs were identified by Brunauer-Emmett-Teller, X-ray diffraction, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy methods. The NOx conversion ratio of ACF was improved from 56.1% to 82.4% at 80°C after modification with 30% (mass ratio) NaOH. These modified ACFs were further loaded with the mixture of MnO2 and CeO2 in the form of metal salt solutions (named as Mn0.5Ce0.5O2/modified ACF). The NOx conversion ratio of 30% SHACF remained similar at 80°C but was increased from 60.0% to 98.5% at 360°C after loading with Mn and Ce, which showed the best performance in SCR of NOx at low temperature. It could be seen that ACF delivered higher performance in low temperature SCR after being modified with the aforementioned reactants and further loading with metals. Based on chemical and physical characterization and the performance of the catalysts, the reasons for different performances of these catalysts in low temperature SCR are discussed.

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“…[24,25] In electrocatalysts with MÀNÀC functionalized group, two crucial factors govern the enhanced ORR activities, i. e., (i) the elemental composition and the interaction between different components, which determine the intrinsic nature of active site; and (ii) interplanar spacing of the neighboring graphene sheets allowing both sides of each graphene sheet to be accessible to the ORR-relevant species (H + , O 2 , H 2 O). [17,27] To better understand the interaction between Pt nanoparticles and FeNÀGnPs, the specific interaction related to PtÀN interaction was identified by X-ray photoemission spectroscopy (XPS). FeÀNÀC functional groups in this graphene nanoplatelets (GnPs) offering the additional catalytic active sites for ORR can lower the amount of Pt while maintaining ORR performance [25] .…”

Section: Introductionmentioning

confidence: 99%

A New Strategy for Outstanding Performance and Durability in Acidic Fuel Cells: A Small Amount Pt Anchored on Fe, N co‐Doped Graphene Nanoplatelets

et al. 2018

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Development of cost‐effective and efficient electrocatalysts for the oxygen reduction reaction (ORR) is one of the most important topics in the polymer electrolyte membrane fuel cells (PEMFCs). Herein, we suggested the enhanced electrochemical catalyst with nanoscale platinum anchored on iron (Fe) and nitrogen (N) co‐doped graphene nanoplatelets (Pt/FeN‐GnPs) with low content of Pt. The nanoscale platinum particles are uniformly anchored on the surface of FeN‐GnPs and result in excellent oxygen reduction activity and stability in acidic media. The fascinating interaction between Pt particles and FeN−GnPs substrate contributed to advanced oxygen reduction activity, outstanding cell performance, and remarkable high stability for acidic PEM fuel cells.

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Improved electrocatalytic activity of carbon materials by nitrogen doping

Cited by 124 publications

References 60 publications

Adsorption capability of activated carbon synthesized from coconut shell

Adsorption capability of activated carbon synthesized from coconut shell

Low temperature SCR of NO with catalysts prepared by modified ACF loading Mn and Ce: effects of modification method

A New Strategy for Outstanding Performance and Durability in Acidic Fuel Cells: A Small Amount Pt Anchored on Fe, N co‐Doped Graphene Nanoplatelets

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