Nitrogen and fluorine co-doped graphite nanofibers as high durable oxygen reduction catalyst in acidic media for polymer electrolyte fuel cells

Peera, Shaik Gouse; Sahu, A. K.; Arunchander, A.; Bhat, Santoshkumar D.; Karthikeyan, J.; Murugan, P.

doi:10.1016/j.carbon.2015.05.002

Cited by 129 publications

(73 citation statements)

References 51 publications

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“…The peak of S 2p is resolved into four components: a doublet of S 2p3/2 (45.9%) and S 2p1/2 (20.9%) at 163.0 and 164.0 eV, respectively; a peak of thiol S at 161 eV; and a broad peak centered at 167.3 eV of oxidized S (Figure a3) . The F peak is deconvoluted into three components corresponding to covalent CF, semi‐ionic CF, and ionic CF (Figure S7, Supporting Information) …”

Section: Resultsmentioning

confidence: 99%

Doped, Defect‐Enriched Carbon Nanotubes as an Efficient Oxygen Reduction Catalyst for Anion Exchange Membrane Fuel Cells

Pham

Britton

Böhm

et al. 2018

Adv Materials Inter

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Bond polarization of doped atoms and carbon and lattice defects are considered important aspects in the catalytic mechanisms of oxygen reduction reaction (ORR) on heteroatom‐doped carbon catalysts. Previous work on metal‐free catalysts has focused either on bond polarization or lattice defects. Here multi‐heteroatom doped defect‐enriched carbon nanotubes (MH‐DCNTs) that combine both effects to enhance ORR activity are designed. Lattice defects in MH‐DCNTs are enriched by unzipping and length‐shortening of carbon nanotubes, and also by creating carbon vacancies via decomposition of doped F atoms. Electrochemical analysis using rotating disc electrode voltammetry shows that the ORR kinetic current density of MH‐DCNT increases with lattice‐defect density, the latter of which is verified by Raman spectroscopy, while the onset potential increases with annealing temperatures. An optimized MH‐DCNT ORR catalyst exhibits a half‐wave potential of 0.81 V versus reversible hydrogen electrode and limiting current density of 5.0 mA cm−2 at an electrode rotation speed of 1600 rpm in 0.1 m KOH. Further, it is demonstrated that MH‐DCNT, as a cathode catalyst layer in an anion exchange membrane fuel cell (AEMFC), delivers a peak power density of 250 mW cm−2, which is ≈70% the performance of an AEMFC using a conventional Pt/C catalyst.

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Section: Resultsmentioning

confidence: 99%

Doped, Defect‐Enriched Carbon Nanotubes as an Efficient Oxygen Reduction Catalyst for Anion Exchange Membrane Fuel Cells

Pham

Britton

Böhm

et al. 2018

Adv Materials Inter

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“…83 Moreover, based on the Raman and XRD results, the increased defect and the enlarged interlayer distance of FNG facilitate the diffusion of Li ion through the defects perpendicular to the interlayer plane as well as along the plane of the graphene layers, providing additional sites in the interlayer space for accommodation of Li ions. 86,87 In order to further prove the proposed mechanism of improved electrochemical performances of NFG samples, the EIS of NFG-150, FG, NG and RGO anodes in charged state After 5 cycles at the current density of 100 mA g -1 are performed (Fig.7a). 86,87 In order to further prove the proposed mechanism of improved electrochemical performances of NFG samples, the EIS of NFG-150, FG, NG and RGO anodes in charged state After 5 cycles at the current density of 100 mA g -1 are performed (Fig.7a).…”

Section: 63mentioning

confidence: 98%

Nitrogen and fluorine co-doped graphene as a high-performance anode material for lithium-ion batteries

et al. 2015

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Supplementary InformaƟon (ESI) available: FT-IR spectrum, Raman spectrum, XRD patterns, XPS survey spectra, TEM and SEM images, the first three CV curves, Cycle performance, and rate capabilities of NG and RGO See Nitrogen and fluorine co-doped graphene (NFG) with the N and F content as high as 3.24 and 10.9 at.% was prepared through the hydrothermal reaction of trimethylamine tri(hydrofluoride) [(C2H5)3N·3HF] and aqueous-dispersed graphene oxide (GO) as the anode material for lithium ion batteries (LIBs). The N and F co-doping in graphene increased the disorder and defects of the framework, enlarged the space of the interlayer, wrinkled the nanosheets with many open-edge sites, and thus faciliated Li ion diffusion through the electrode compared with sole-N or F doped graphene. X-ray photoelectron spectroscopy (XPS) analysis of NFG demonstrated the presence of active pyridine and pyrrolic types N, and highly electrical conductive graphitic N and semi-ionic C-F bond in the structure. The N and F doping content and the component types of N and F functional groups could be controlled by the hydrothermal temperature. The NFG prepared at 150°C exhibited the best electrochemical performances tested as the anode of LIBs, including the high coulombic efficiency in the first cycle (56.7%), superior reversible specific discahrge capacity (1075 mAh g −1 at 100 mA g −1 ), excellent rate capabilities (305 mAh g −1 at 5 A g −1 ), and outstanding cycling stability (capacity retention of ~95% at 5 A g −1 after 2000 cycles), which demonstrated NFG was a promising candidate for anode materials of high-rate LIBs. 18,20,25 Recently, it has been realized that doping graphene with two or more kinds of heteroatoms can further improve its electrochemical performances because Li-ion storage is not only related with the contents of heteroatoms but also with

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“…For example the performance of nitrogen doped carbon nanotubes is different from nitrogen doped graphene [15,16]. The amorphous carbon and graphitic carbon show different activity after nitrogen doping [12,17,18]. Although carbon is relatively cheap, the carbon source and preparation technique also should be optimized to further reduce the cost.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen doped graphitic carbon ribbons from cellulose as non noble metal catalyst for oxygen reduction reaction

Lin

et al. 2016

International Journal of Hydrogen Energy

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Nitrogen and fluorine co-doped graphite nanofibers as high durable oxygen reduction catalyst in acidic media for polymer electrolyte fuel cells

Cited by 129 publications

References 51 publications

Doped, Defect‐Enriched Carbon Nanotubes as an Efficient Oxygen Reduction Catalyst for Anion Exchange Membrane Fuel Cells

Doped, Defect‐Enriched Carbon Nanotubes as an Efficient Oxygen Reduction Catalyst for Anion Exchange Membrane Fuel Cells

Nitrogen and fluorine co-doped graphene as a high-performance anode material for lithium-ion batteries

Nitrogen doped graphitic carbon ribbons from cellulose as non noble metal catalyst for oxygen reduction reaction

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