The effect of N precursors in Fe-N/C type catalysts based on activated silicon carbide derived carbon for oxygen reduction activity at various pH values

Jäger, Rutha; Kasatkin, Piia Ereth; Härk, Eneli; Teppor, Patrick; Romann, Tavo; Härmas, Riinu; Tallo, Indrek; Mäeorg, Uno; Joost, Urmas; Paiste, Päärn; Kirsimäe, Kalle; Lust, Enn

doi:10.1016/j.jelechem.2018.06.040

Cited by 22 publications

(22 citation statements)

References 33 publications

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“…The thermal decomposition of the precursors used for the Ndoping and addition of the iron (1,10-phenanthroline, iron(II) acetate) leads to the formation of coordinated-Fe active sites in the catalysts. [8,20] Therefore it was rather expected that besides the C 1s and O 1s that is inherent to the undoped GO and graphene [7] also N 1s and Fe 2p peaks were detected in the XPS survey spectra for both catalysts (FeÀ NÀ GO and FeÀ NÀ Gra, Figure 1). The presence of iron and nitrogen further confirms the successful doping of the substrate materials with these elements.…”

Section: Physical Characterization Of Undoped and Fe-n-doped Graphenementioning

confidence: 99%

Iron‐ and Nitrogen‐Doped Graphene‐Based Catalysts for Fuel Cell Applications

et al. 2020

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A simple synthesis method was used to prepare an active oxygen reduction reaction (ORR) electrocatalyst based on iron and nitrogen co‐doped graphene for polymer electrolyte fuel cell applications. For the synthesis of the ORR catalysts, two different graphene‐based materials, commercially available graphene (Gra) and graphene oxide (GO), were used as the carbon substrates. The half‐cell experiments conducted by using the rotating disc electrode (RDE) method revealed that Fe−N−Gra showed much higher ORR electrocatalytic activity than Fe−N−GO in alkaline medium. This is attributed to the higher surface area, micro‐/mesoporous nature and larger amount of Fe‐Nx/amine moieties present in Fe−N−Gra compared to Fe−N−GO, as shown by different physicochemical methods. Almost half of the iron was confirmed to be in highly active Fe‐Nx form by 57Fe Mössbauer spectroscopy. Thus, the Fe−N−Gra as ORR catalyst was further selected to apply this for both proton exchange membrane (PEM) and anion exchange membrane (AEM) fuel cell tests.

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Section: Physical Characterization Of Undoped and Fe-n-doped Graphenementioning

confidence: 99%

Iron‐ and Nitrogen‐Doped Graphene‐Based Catalysts for Fuel Cell Applications

et al. 2020

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“…Several authors have already presented data concerning the stability of their novel M-N/C catalysts in addition to their activity. 3,10,14 Based on these studies it is clear that the stability of these M-N/C type catalysts is severely lacking, especially when measured in acidic media. Accordingly, further research is needed to identify and synthesize catalysts with both high ORR activity and enhanced electrocatalytic stability.…”

mentioning

confidence: 99%

“…Previously our workgroup used 5 different N precursors to synthesize Fe-N/C type ORR catalysts. 10 In that study, the most ac-tive catalyst materials were obtained with 2,2'-bipyridine and 1,10phenanthroline and these compounds were selected as the N pre-cursors for the synthesis of our novel Co-N/C type catalysts. In our previous work we presented only first results about the activity and sta-bility of these Co-N/C materials in acidic media.…”

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confidence: 99%

ORR Activity and Stability of Co-N/C Catalysts Based on Silicon Carbide Derived Carbon and the Impact of Loading in Acidic Media

Teppor

Jäger

Härk

et al. 2018

J. Electrochem. Soc.

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A simple and facile synthesis method was used to produce two Co-N/C type oxygen reduction reaction (ORR) catalysts. The materials were initially characterized by utilizing a variety of physical methods. Most importantly, the XPS analysis revealed high amounts of pyridinic nitrogen and CoN x species in the case of both studied Co-N/C catalysts. The electrochemical characterization showed that both of the synthesized Co-N/C catalysts have a high ORR activity in acidic media, displaying a half-wave potential of 0.70 V vs RHE. Additionally, the effect of varying the catalyst loading was studied and it was found that increasing the catalyst loading from 0.1 to 1.8 mg cm −2 significantly improved the ORR activity and the electron transfer number. Finally, several catalysts were subjected to a week-long stability test in order to establish their activity degradation rates. It was found that increased degradation rates of the Co-N/C catalysts were established at decreased catalyst loadings.

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“…Several CDC-based catalysts have already shown significant ORR catalytic activity in acidic [44][45][46] or alkaline conditions [26,47]. However, due to the initial particle size of inexpensive carbide precursors, the particle size of the final catalysts shown in the literature to date (average particle diameter >500 nm) has been larger than desired for fuel cell purposes [44].…”

Section: Introductionmentioning

confidence: 99%

Non-precious metal cathodes for anion exchange membrane fuel cells from ball-milled iron and nitrogen doped carbide-derived carbons

et al. 2021

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Iron and nitrogen doping of carbon materials is one of the promising pathways towards replacing Pt/C in polymer electrolyte fuel cell cathodes. Here, we show a synthesis method to produce highly active non-precious metal catalysts and study the effect of synthesis parameters on the oxygen reduction reaction (ORR) activity in high-pH conditions. The electrocatalysts are prepared by functionalizing silicon carbide-derived carbon (SiCDC) with 1,10-phenanthroline, iron(II)acetate and, optionally polyvinylpyrrolidone, by ball-milling with ZrO2 in dry or wet conditions, followed by pyrolysis at 800 °C. The catalysts are characterized by scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, N2 physisorption and inductively coupled plasma mass spectrometry. By optimizing the ball-milling conditions, we achieved a reduction in the size of SiCDC grains from >1 µm to 200 nm without negatively affecting the

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The effect of N precursors in Fe-N/C type catalysts based on activated silicon carbide derived carbon for oxygen reduction activity at various pH values

Cited by 22 publications

References 33 publications

Iron‐ and Nitrogen‐Doped Graphene‐Based Catalysts for Fuel Cell Applications

Iron‐ and Nitrogen‐Doped Graphene‐Based Catalysts for Fuel Cell Applications

ORR Activity and Stability of Co-N/C Catalysts Based on Silicon Carbide Derived Carbon and the Impact of Loading in Acidic Media

Non-precious metal cathodes for anion exchange membrane fuel cells from ball-milled iron and nitrogen doped carbide-derived carbons

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