Effect of transition metal induced pore structure on oxygen reduction reaction of electrospun fibrous carbon

Shin, Dongyoon; Xianghua, An; Choun, Myounghoon; Lee, Jae Kwang

doi:10.1016/j.cattod.2015.07.019

Cited by 29 publications

(31 citation statements)

References 31 publications

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“…On the other hand, PM-CNF shows increased BET and BJH surface areas of 46.85 and 36.81 m 2 g À1 (Figure 2a). In the N 2 ads/des isotherm plot and BJH plot of the pore size distribution (Figure 2b,c), ar ising backward peak indicates that PM-CNF predominantly has meso/macropores (> 10 nm) formed by the elimination of PMMA from the CNF.A so ur previous work reported, [15,18] the water vapor treatment substantially increases the BET surface area of Va p-CNF,m easured to be 411.85 m 2 g À1 (Figure 2a). TheN 2 ads/des isotherm plot for Va p-CNF shows arising forward peak indicating that the increase in the BET surface area is mostly attributed to am icroporous structure (< 2nm) (Figure 2b).…”

Section: Zuschriftenmentioning

confidence: 77%

“…[6,10,11] We carried out X-ray photoelectron spectroscopy (XPS) measurements of the NDCs and characterized the Nd istributions of the NDCs with deconvolution methods (Figures 3a nd Figure S1 in the Supporting Information). [15,18,19] In particular, graphitic-N and pyridinic-N are enriched in the NDCs,compared with other nitrogen species. 398 eV), pyrrolic-N (ca.…”

Section: Zuschriftenmentioning

confidence: 99%

“…[12][13][14][15][16] In addition, for the first time,the performances of the DHFCs with these metal-free catalysts as the anodes are evaluated. Thep ore size in/on the NDCs is selectively controlled by poly(methyl methacrylate) (PMMA) and water vapor treatments to fabricate the following materials:N -doped carbon nanofiber (CNF), PMMA-treated CNF (PM-CNF), water-vapor-treated CNF (Vap-CNF), and both PMMA-and water-vapor-treated CNF (Vap-PM-CNF).…”

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confidence: 99%

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Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

2017

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Section: Zuschriftenmentioning

confidence: 77%

Section: Zuschriftenmentioning

confidence: 99%

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Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

2017

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“…The pore size in/on the NDCs is selectively controlled by poly(methyl methacrylate) (PMMA) and water vapor treatments to fabricate the following materials: N‐doped carbon nanofiber (CNF), PMMA‐treated CNF (PM‐CNF), water‐vapor‐treated CNF (Vap‐CNF), and both PMMA‐ and water‐vapor‐treated CNF (Vap‐PM‐CNF). With four different NDCs, we first intended to investigate the influence of the pore size distribution on the catalytic activities of the NDCs toward the HDOR, as we revealed that the pore size and structure could affect the catalytic activity in oxygen electrocatalysis . In addition, for the first time, the performances of the DHFCs with these metal‐free catalysts as the anodes are evaluated.…”

Section: Figurementioning

confidence: 99%

Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

2017

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Metal-free N-doped porous carbon has great potential as ac atalyst for hydrazine oxidation in direct hydrazine fuel cells (DHFCs). However,p revious studies have reported only half-cell characterization, and the effect of the pore sizedistribution has not been intensively investigated. Herein, we report the synthesis of highly active,m etal-free Ndoped carbon (NDC) by controlling the pore sizedistribution, and for the first time,the effect of the pore size distribution on the anode performance in aDHFC is investigated. As aresult, tree-bark-shaped NDC with meso/macroporous (> 10 nm) structures exhibit ar emarkable power density of 127.5 mW cm À2 in aDHFC.Recently,the demand for renewable and clean energy sources has gradually increased owing to the exhaustion of fossil fuels accompanied by an umber of environmental problems.A sa ne ffort to use alternative energy sources, various kinds of energy conversion systems have been developed. Forinstance,Evans and Kordesch [1] first suggested the concept of adirect hydrazine fuel cells (DHFC) system in the 1960s,w hich eventually attracted substantial attention because of its advantages as an anode:1 )the high energy density of hydrazine,2)ahigh theoretical cell potential, 3) the absence of platinum-group metals,and 4) zero CO 2 emissions. Because of these advantages,anumber of studies have been reported on developing catalysts for the oxidation of hydrazine. [2][3][4][5][6][7][8][9][10][11] Since Asazawa et al. [2] unveiled that noble-metalfree catalysts,N ia nd Co,e xhibit higher activities toward hydrazine oxidation than Pt in DHFCs,most of the studies on DHFCs have focused on the development and characterization of noble-metal-free catalysts over the last few decade. Recently,M eng et al. [6] developed am etal-free catalyst, polypyrrole-derived Na nd Oc o-doped mesoporous carbon, for the hydrazine oxidation reaction (HDOR), but there has not been ar eport on its fuel-cell performance so far.

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“…[1][2][3][4][5][6] Compared with precious metals, nickel and other transition metals are relatively more abundant and following appropriate activation can offer high catalytic activity. [7][8][9][10][11][12] Equally important is the development of high activity catalysts that maintain their activity with time especially at higher processing temperatures.…”

Section: Introductionmentioning

confidence: 99%

Chemical modification in and on single phase [NiO]_0.5[Al₂O₃]_0.5 nanopowders produces “chocolate chip‐like” Ni_x@[NiO]_0.5‐x[Al₂O₃]_0.5 nanocomposite nanopowders

Wang

Sun

et al. 2019

J Am Ceram Soc

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Phase‐pure [NiO]0.5[Al2O3]0.5 spinel nanoparticles (NPs) with limited aggregation were obtained via liquid‐feed flame spray pyrolysis (LF‐FSP) by combusting metalloorganic precursor solutions. Thereafter “chocolate chip‐like” Nix[NiO0.5‐x][Al2O3]0.5 nanoparticles consisting of primary [NiO0.5‐x][Al2O3]0.5 particles with average particle sizes of 40‐60 nm decorated with Ni metal particles (<10 nm in diameter) dispersed on the surface were synthesized by heat treating the spinel NPs at 800°C/7 h in flowing 5% H2:N2 100 mL/min in a fluidized bed reactor. The synthesized materials were characterized using TEM, XRD, FTIR, and TGA/DTA. The Ni depleted areas consist primarily of γ‐Al2O3. The Ni content (800°C) was determined by TGA to be ≈11.3 wt.% based on TGA oxidation behavior. The successful synthesis of such nanocomposites with limited aggregation on a high temperature support provides a facile route to synthesize well‐defined NP catalysts. This work serves as a baseline study for an accompanying paper, wherein thin, flexible, dense films made from these same NPs are used as regenerable catalysts for carbon nanotube syntheses.

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Effect of transition metal induced pore structure on oxygen reduction reaction of electrospun fibrous carbon

Cited by 29 publications

References 31 publications

Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

Chemical modification in and on single phase [NiO]_0.5[Al₂O₃]_0.5 nanopowders produces “chocolate chip‐like” Ni_x@[NiO]_0.5‐x[Al₂O₃]_0.5 nanocomposite nanopowders

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Effect of transition metal induced pore structure on oxygen reduction reaction of electrospun fibrous carbon

Cited by 29 publications

References 31 publications

Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

Tree‐Bark‐Shaped N‐Doped Porous Carbon Anode for Hydrazine Fuel Cells

Chemical modification in and on single phase [NiO]0.5[Al2O3]0.5 nanopowders produces “chocolate chip‐like” Nix@[NiO]0.5‐x[Al2O3]0.5 nanocomposite nanopowders

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Chemical modification in and on single phase [NiO]_0.5[Al₂O₃]_0.5 nanopowders produces “chocolate chip‐like” Ni_x@[NiO]_0.5‐x[Al₂O₃]_0.5 nanocomposite nanopowders