Electrochemical Behavior of Iron-Carbon Composites Prepared from Ferrocene-Poly (furfuryl Alcohol)

Ozaki, Jun‐ichi; Mitsui, Misato; Nishiyama, Yoshiyuki

doi:10.7209/tanso.1994.269

Cited by 9 publications

(12 citation statements)

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“…For this purpose, we have utilized the catalytic effects of heteroatoms toward the carbonization [4][5][6]. Transition metals such as iron, nickel and cobalt are known to be active for carbon gasification [7], carbon deposition [8], and catalytic graphitization [9].…”

Section: Introductionmentioning

confidence: 99%

Structures, physicochemical properties and oxygen reduction activities of carbons derived from ferrocene-poly(furfuryl alcohol) mixtures

Ozaki¹,

Nozawa²,

Yamada³

et al. 2005

J Appl Electrochem

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The structure, physicochemical properties and oxygen reduction abilities of carbons prepared by the carbonization of mixtures of ferrocene and poly(furfuryl alcohol) were studied. X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM) studies revealed that the carbons thus prepared consisted of two components; amorphous and turbostratic shell-like components. The fraction, f sharp , obtained by the analysis of the (002) peak in XRD was found to be a parameter that represented the degree of formation of the shell-like components. The formation of the shell-like components induced an increase in the mesopore volumes. Electrical conductivity increased exponentially with f sharp , which indicated that the conduction process was governed by a percolation process of the conductive shell-like components. The amount of CO-desorption by O 2 -TPD technique showed a maximum desorption at f sharp =0.3, and the further development in the sharp component led to a decrease in the CO-desorption. Mo¨ssbauer spectroscopy technique revealed the presence of a-Fe, c-Fe, Fe 1-x O and Fe 3 C in the prepared carbons, which were soluble species to acids. The oxygen reduction activity was studied in a oxygen saturated sulfuric acid solution by rotating disk electrode voltammetry. The oxygen reduction potential varied with f sharp ; initially it increased by f sharp =0.3 and then it decreased at higher f sharp values. This behavior was similar to that of CO-desorption, which meant the presence of an adequate degree of the development of the shell-like structure for maximizing oxygen adsorption. Removal of the surface metal component from the carbons by acidwashing resulted in no decrease in the oxygen reduction activities of the carbons. The nature of the active sites on the carbon materials is discussed.

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Section: Introductionmentioning

confidence: 99%

Structures, physicochemical properties and oxygen reduction activities of carbons derived from ferrocene-poly(furfuryl alcohol) mixtures

Ozaki¹,

Nozawa²,

Yamada³

et al. 2005

J Appl Electrochem

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“…Cyclic voltammograms of nanoshell-containing carbons. 13 Reprinted by permission of the publisher, The Carbon Society of Japan. The ORR activity of the aforementioned BN-doped carbon has been demonstrated to depend on the amounts of the nitrogen species located in the peripheral part of graphitic layers such as pyridinetype or pyrrole/pyridone-type carbon, referred to as N edge .…”

Section: Bn-doped Carbon Alloy Catalystsmentioning

confidence: 99%

“…[13][14][15][16] The application of carbon to the oxygen reduction reaction (ORR) led to our current study on carbon alloy catalysts for fuel cell cathodes, 17,18 which are examples of catalytic carbonization. We have also developed boron nitrogen-doped carbon.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon Alloys Exhibiting ORR Catalytic Activity 2.1 Discovery of electrochemically active carbon 13 First, nanoshell-containing carbon (NSCC) was prepared by adding ferrocene to poly(furfuryl alcohol), a starting polymer of glass-like carbon, to be carbonized. The obtained NSCC exhibited a reversible response to the redox reaction of Fe(CN) 6 3¹ /Fe(CN) 6 4¹ , as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…1; the rate of heterogeneous charge transfer was as high as that of a platinum electrode. 13 From transmission electron microscopy and X-ray diffraction (XRD) results, NSCC was observed to contain shell-like carbon particles having a diameter of 20-50 nm, and the shells consisted of stacked graphitic layers; such a structure is termed as a nanoshell (NS), 18 as coined by Ozaki et al This study commenced subsequent studies on carbon alloy catalysts used in cathodes of fuel cells.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Alloy Catalysts for Polymer Electrolyte Fuel Cells: Exploration of Materials and Understanding of Mechanisms

Ozaki

Imashiro

2015

Electrochemistry

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The launch of the fuel cell vehicle (FCV) in December 2014 has moved our society into the era of hydrogen energy. Expectations for, and demands on, this technology will first increase steadily and then explosively. Owing to the scarcity of available natural resources and considering costs, the development of cathodes using non-platinum catalysts is an important issue to be addressed for the stable and secure provision of FCVs. We have been developing carbon alloy catalysts, such as nanoshell-containing carbon and boron nitrogen (BN)-doped carbon catalysts, where catalytic activities originate from the carbon surface and not from surface metal complexes. First, we discuss the discovery of carbon materials exhibiting electrocatalytic activity followed by their application to ORR. Second, we provide experimental evidence for ORR activity originating from warped graphitic layers. Next, we describe useful methods to obtain highly active carbon alloy catalysts. Finally, we report a notable single cell performance of 0.65 W/cm 2 using air as the oxidant.

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Catalytic Carbons – Cathode Catalytic Carbons

Ozaki

2013

Handbook of Advanced Ceramics

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Electrochemical Behavior of Iron-Carbon Composites Prepared from Ferrocene-Poly (furfuryl Alcohol)

Cited by 9 publications

References 0 publications

Structures, physicochemical properties and oxygen reduction activities of carbons derived from ferrocene-poly(furfuryl alcohol) mixtures

Structures, physicochemical properties and oxygen reduction activities of carbons derived from ferrocene-poly(furfuryl alcohol) mixtures

Carbon Alloy Catalysts for Polymer Electrolyte Fuel Cells: Exploration of Materials and Understanding of Mechanisms

Catalytic Carbons – Cathode Catalytic Carbons

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