Oxygen reduction reaction (ORR) catalyzed by carbon-supported cobalt polypyrrole (Co-PPy/C) electrocatalysts

Lee, Kunchan; Zhang, Lei; Lui, Hansan; Hui, Rob; Shi, Zheng; Zhang, Jiujun

doi:10.1016/j.electacta.2009.03.081

Cited by 298 publications

(205 citation statements)

References 35 publications

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“…However, several decades of effort have led to the proposal of two kinds of catalyst active sites: one is M-N x (M = Fe or Co, and x could be 2 or 4) [7], and the other is a C-N group on the carbon support surface, formed by decomposition of the nitrogen-containing ligand [24]. These two kinds of catalyst active sites were observed using XPS in our previous work [13,24]. For heat-treated binary catalysts such as Fe/Co-N, the dominant catalytic sites in addition to the C-N group are thought to be MN 4 cores and the face-to-face structure formed by these cores [15].…”

Section: Possible Catalyst Active Sites For Orrmentioning

confidence: 99%

Synthesis of carbon-supported binary FeCo–N non-noble metal electrocatalysts for the oxygen reduction reaction

Kim

Pan

et al. 2010

Electrochimica Acta

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited.In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit:

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Section: Possible Catalyst Active Sites For Orrmentioning

confidence: 99%

Synthesis of carbon-supported binary FeCo–N non-noble metal electrocatalysts for the oxygen reduction reaction

Kim

Pan

et al. 2010

Electrochimica Acta

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“…2527 In contrast, CNT demonstrate high oxidative stability. 28 In addition, CNTS have the needed characteristics for next generation cathode current collectors, including strength, flexibility, and ability to be fabricated in variable thicknesses and on a large scale.…”

Section: Alternative Electrode Structures and Substratesmentioning

confidence: 99%

Secondary Battery Science: At the Confluence of Electrochemistry and Materials Engineering

2012

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Considerations of energy density, power, and calendar life are critical to effectively develop advanced secondary systems. For next generation battery applications requiring multiple features including long life, large cycle count, high energy density and high power, new strategies are needed for the rational design of electroactive materials and electrodes. This article discusses several conceptual approaches under exploration with examples from our research group. The first approach is the systematic synthesis of materials with structures facilitating ion insertion and deinsertion at high voltage and energy density, where we control materials properties such as surface area, particle size and in particular crystallite size. A second approach is the investigation of novel electrode structures and substrates to increase energy density and capacity retention under cycling, where we have developed strategies for minimizing passive components. A third approach is investigation of catalysts for metal air batteries where the cathode active material is drawn from the air rather than carried in the battery.

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“…Iron-or cobalt-doped carbon-nitrogen (CN x ) compounds have comparable activity to Pt/C catalysts in acidic systems [4,7,9,20]. Polypyrrole modified carbon-supported cobalt hydroxide can act as cathode and anode catalysts in direct borohydride fuel cells [21,22].…”

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confidence: 99%

“…Therefore, research into non-precious metals or even metal-free catalysts with high ORR activity and durability is absolutely crucial for the development of fuel cells. Currently, it is widely accepted that nitrogen-containing carbon including macrocycle molecules [6][7][8], polymers [4,9] and nanomaterials [10][11][12][13][14][15][16][17][18][19] are a type of important building block for the preparation of Pt-substituted catalysts.Iron-or cobalt-doped carbon-nitrogen (CN x ) compounds have comparable activity to Pt/C catalysts in acidic systems [4,7,9,20]. Polypyrrole modified carbon-supported cobalt hydroxide can act as cathode and anode catalysts in direct borohydride fuel cells [21,22].…”

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Carbon-nitrogen/graphene composite as metal-free electrocatalyst for the oxygen reduction reaction

Zhang

et al. 2011

Chin. Sci. Bull.

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Sheet-like carbon-nitrogen (CN x )/graphene composites with a high content of nitrogen (x  0.15) was prepared by the carbonization of polypyrrole (PPy)/reduced-graphene-oxide (rGO) composite at 600-800°C. We used rGO instead of graphene oxide (GO) sheets as a template and a substrate to immobilize PPy since the PPy/GO composite agglomerates easily because of the dehydration of excess oxygen-containing groups on the GO sheets during the drying process. The dried PPy/rGO intermediate and its derived CN x /graphene products retain their high dispersion and loose-powder features. The as-prepared CN x /graphene composites have a total nitrogen content of about 10 at% and their nitrogen state is mainly of pyridinic and graphitic type. CN x /graphene composites exhibit excellent performance for the oxygen reduction reaction (ORR) in terms of electrocatalytic activity, stability and immunity towards methanol crossover and CO poisoning, suggesting their potential as metal-free electrocatalysts for the ORR. Low temperature fuel cells are a high-efficiency and environment-friendly energy supply for future transport and portable applications [1,2]. However, despite the great efforts worldwide over the past few decades their wide application in daily life is still a challenge because of the scare resources, high cost and durability issues for the current commercial Pt/C catalysts, especially for cathodes where the oxygen reduction reaction (ORR) is kinetically slow [3][4][5]. Therefore, research into non-precious metals or even metal-free catalysts with high ORR activity and durability is absolutely crucial for the development of fuel cells. Currently, it is widely accepted that nitrogen-containing carbon including macrocycle molecules [6][7][8], polymers [4,9] and nanomaterials [10][11][12][13][14][15][16][17][18][19] are a type of important building block for the preparation of Pt-substituted catalysts.Iron-or cobalt-doped carbon-nitrogen (CN x ) compounds have comparable activity to Pt/C catalysts in acidic systems [4,7,9,20]. Polypyrrole modified carbon-supported cobalt hydroxide can act as cathode and anode catalysts in direct borohydride fuel cells [21,22]. Recent promising results involving metal-free PEDOT [5] and nitrogen-doped carbon nanotubes (NCNTs) [14][15][16][17][18][19] have been reported for alkaline systems giving excellent electrocatalytic activity, stability and immunity towards methanol crossover and CO poisoning. Particularly, NCNTs have attracted extensive interest because of their large surface area, good thermal and chemical stability as well as high electrical conductivity [14][15][16][17][18][19]. It has been revealed that increasing the nitrogen content and the number of defects in NCNT enhances its electrocatalytic activity toward the ORR [11,16]. In addition to one-dimensional CNTs, the emergence of graphene has opened up a new field in terms of research into two-dimensional (2D)

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Oxygen reduction reaction (ORR) catalyzed by carbon-supported cobalt polypyrrole (Co-PPy/C) electrocatalysts

Cited by 298 publications

References 35 publications

Synthesis of carbon-supported binary FeCo–N non-noble metal electrocatalysts for the oxygen reduction reaction

Synthesis of carbon-supported binary FeCo–N non-noble metal electrocatalysts for the oxygen reduction reaction

Secondary Battery Science: At the Confluence of Electrochemistry and Materials Engineering

Carbon-nitrogen/graphene composite as metal-free electrocatalyst for the oxygen reduction reaction

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