Nitrogen-doped ordered porous carbon catalyst for oxygen reduction reaction in proton exchange membrane fuel cells

Ok, Jinhee; Jeon, Yukwon; Yoon, Seong Ho; Shul, Yong Gun

doi:10.1007/s10008-013-2135-y

Cited by 20 publications

(16 citation statements)

References 24 publications

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“…The performance decrease of the fuel cell was 215 µA cm -2 h -1 over a 120 h test at 0.4 V. Liu et al [64] studied the nitrogen structure of a N-modified carbon before and after a H 2 /O 2 fuel cell test of 100 h and they linked the stability of the catalyst to the quarternary nitrogens, while pyridinic nitrogens protonate under the acidic conditions and become inactive. Similar conclusion about durability was made by Dorjgotov et al [65] and they also showed performance equivalent of Pt catalyst in H 2 /O 2 fuel cell (0.52 A cm -2 at 0.6 V).…”

supporting

confidence: 85%

Highly efficient cathode catalyst layer based on nitrogen-doped carbon nanotubes for the alkaline direct methanol fuel cell

Kanninen

Borghei

Sorsa

et al. 2014

Applied Catalysis B: Environmental

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supporting

confidence: 85%

Highly efficient cathode catalyst layer based on nitrogen-doped carbon nanotubes for the alkaline direct methanol fuel cell

Kanninen

Borghei

Sorsa

et al. 2014

Applied Catalysis B: Environmental

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“…The ordered mesoporous silica of SBA-15 was used as a template [27], which was prepared by following the procedure by Mukaddes. C [28].…”

Section: Methodsmentioning

confidence: 99%

“…In the second step, heat treatment was carried out in N 2 at 1000 o C for 1 h to produce the catalyst. Fe and Fe+Co were deposited into the mesoporous doped carbons with metal amount of 1.5 wt%, which were optimized from our previous study [27]. The obtained catalyst were named as catalyst and denoted as ILCFe-HT (HT-heat treated at 1000 o C) and ILC-Fe+Co-HT, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…In Table 1, the total carbon concentrations were 60.83, 75.30 and 84.81% with a higher carbonization rate for ILC-500 °C, ILC-700 °C, and ILC-900 °C, respectively, which may provide better conductivity during the ORR. In general, there are several types of C groups in the synthesized ILCs by the appearance of several spectral peaks: C-C at 284.6 eV (C1), C-O at 285.5 eV (C2), C=O and C-N at 286.3 eV(C3) and C-C=O at 287.1 eV (C4) [27]. The peak intensities of the C-C (C1) species shows an increase depending on the temperature growth as shown in Fig.…”

Section: Characterization Of Ilsmentioning

confidence: 99%

“…2(a). On the other hand, the peak intensity of the COx species (C2-C4) is decreased as the synthesizing temperature is increased where the oxygen containing surface groups (COx) in the catalysts are not active sites [27]. The structure of ILCs, synthesized at various temperatures, were also analyzed by the characterization results from the N1s XPS, as can be seen in Fig.…”

Section: Characterization Of Ilsmentioning

confidence: 99%

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One-step synthesis of dual-transition metal substitution on ionic liquid based N-doped mesoporous carbon for oxygen reduction reaction

Byambasuren

Jeon

et al. 2016

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Nitrogen (N)-doped ordered mesoporous carbons (OMCs) with a dual transition metal system were synthesized as non-Pt catalysts for the ORR. The highly nitrogen doped OMCs were prepared by the precursor of ionic liquid (3-methyl-1-butylpyridine dicyanamide) for N/C species and a mesoporous silica template for the physical structure. Mostly, N-doped carbons are promoted by a single transition metal to improve catalytic activity for ORR in PEMFCs. In this study, our N-doped mesoporous carbons were promoted by the dual transition metals of iron and cobalt (Fe, Co), which were incorporated into the N-doped carbons lattice by subsequently heat treatments. All the prepared carbons were characterized by via transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). To evaluate the activities of synthesized doped carbons, linear sweep was recorded in an acidic solution to compare the ORR catalytic activities values for the use in the PEMFC system. The dual transition metal promotion improved the ORR activity compared with the single transition metal promotion, due to the increase in the quaternary nitrogen species from the structural change by the dual metals. The effect of different ratio of the dual metals into the N doped carbon were examined to evaluate the activities of the oxygen reduction reaction.

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Pyrolysis of Iron‐Containing Polyanilines under Micropore Generation Control: Electrocatalytic Performance in the Oxygen Reduction Reaction

et al. 2020

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Pyrolyzed iron-containing polyaniline (CÀ Fe-PANI) is one of the most promising candidates as a non-precious metal based electrocatalyst for oxygen reduction reaction (ORR). Although the ORR activity depends on the surface area arisen from pyrolysis-generated micropores on CÀ Fe-PANI particles, the micropore generation is hindered by pyrolysis-formed iron nanoparticles (Fe NPs) embedded inside CÀ Fe-PANI particles. Here, we demonstrate the pyrolysis of iron-containing PANIs under suppression of micropore-generation hindrance by blocking the Fe NPs formation. The higher-molecular-weight (MW: 100,000) PANI was dispersed in an FeCl 3 solution before pyrolysis for preventing FeCl 3 penetration inside PANI particles. As a result, as compared to the case of lower-MW (5,000) PANI, the Fe NPs formation was more suppressed inside catalyst particles to give 1.9 (1.8) times micropore volume (specific surface area), leading to a 11 % higher current density in ORR electrocatalytic performance test in acidic media. Polymer electrolyte fuel cells (PEFCs) attract considerable attentions as potential power sources for both stationary and mobile applications. [1] To increase energy conversion efficiency, Pt-based materials are currently employed as the catalysts for both hydrogen oxidation reactions (HORs) at the anode and oxygen reduction reactions (ORRs) at the cathode. [1c] However, due to kinetically sluggish ORRs, as compared to HOR, a relatively large amount of Pt would need to be used at the cathode, making PEFCs too expensive to be applied as practical power sources. For the widespread application of PEFCs, therefore, a low-cost ORR catalyst with high performance must be developed. From such a view point, low-Pt or non-precious metal based electrocatalysts have been developed for ORR. Among them, non-precious metal based catalysts attract attentions because of their low cost. This seems to evolve from the report on ORR catalytic activity of Cophthalocyanine, [2] one of the N 4-chelate complexes. After that, the stability of N 4-chelates in acidic media was enhanced through the thermal pretreatment on carbon supports. [3] Since then, a huge number of researchers have reported a wide variety of analogous carbonaceous materials containing heteroatoms (e. g. N, B, P, S) and/or transition metal species (e. g. Fe, Co, Cu, Mn, Ni) with or without carbon supports. [4] On the other hand, polyaniline (PANI) is well known as one of the conducting polymers possessing the redox properties. Thus far, we have reported complexation of PANI with various transition metals [5] and catalytic reactions [6] mediated by the complexes. In this case, d-π conjugated systems are considered to be formed. Meanwhile, PANI is one of the most promising candidates as a precursor for ORR electrocatalysts. The pyrolyzed products of such complexes or mixtures comprising transition metals and PANIs

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Nitrogen-doped ordered porous carbon catalyst for oxygen reduction reaction in proton exchange membrane fuel cells

Cited by 20 publications

References 24 publications

Highly efficient cathode catalyst layer based on nitrogen-doped carbon nanotubes for the alkaline direct methanol fuel cell

Highly efficient cathode catalyst layer based on nitrogen-doped carbon nanotubes for the alkaline direct methanol fuel cell

One-step synthesis of dual-transition metal substitution on ionic liquid based N-doped mesoporous carbon for oxygen reduction reaction

Pyrolysis of Iron‐Containing Polyanilines under Micropore Generation Control: Electrocatalytic Performance in the Oxygen Reduction Reaction

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