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2 article(s) from Zeis, Roswitha

Porous N- and S-doped carbon–carbon composite electrodes by soft-templating for redox flow batteries

Maike Schnucklake,
László Eifert,
Jonathan Schneider,
Roswitha Zeis and
Christina Roth

Beilstein J. Nanotechnol. 2019, 10, 1131–1139, doi:10.3762/bjnano.10.113

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Figure 1: Schematic illustration of the synthesis route using the soft-templating approach to obtain porous c...

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Figure 2: High-resolution images of carbonized carbon felt (left: a,d), N-doped carbon felt (middle: b,e) and...

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Figure 3: SEM image of the co-doped composite electrode and corresponding colored mappings of carbon, nitroge...

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Figure 4: Nitrogen sorption isotherms of the synthesized composite electrode with nitrogen doping (upper line...

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Figure 5: High-resolution XPS spectra including the fitting of the carbonized carbon felt (a,b) and the co-do...

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Figure 6: Comparison between the cyclic voltammetry curves of the N-doped (purple) and co-doped (blue, green)...

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Figure 7: Nyquist plots showing the EIS data for the carbonized felts (orange, red) as well as for the compos...

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Full Research Paper

Published 28 May 2019

Full text

Materials and characterization techniques for high-temperature polymer electrolyte membrane fuel cells

Roswitha Zeis

Beilstein J. Nanotechnol. 2015, 6, 68–83, doi:10.3762/bjnano.6.8

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Figure 1: Illustration of the proton-conduction mechanisms of Nafion. Nafion polymer chains self-align into a...

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Figure 2: Illustration of the proton conducting mechanisms in phosphoric acid (Grotthuss mechanism). 'Excess'...

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Figure 3: Chemical structures of m-PBI (poly[2,2-(m-phenylene)-5,5-bibenzimidazole]) and AB-PBI (poly(2,5-ben...

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Figure 4: Doping process of an AB-PBI membrane in hot phosphoric acid at various temperatures. The weight inc...

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Figure 5: Conductivity of acid-doped PBI and Nafion as a function of humidity at various temperatures. Reprod...

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Figure 6: Interaction between PBI polymer host and phosphoric acid. Chemical structures of the proton transfe...

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Figure 7: Left: Schematic drawing of an electrocatalyst composed of Pt nanoparticles loaded on the PBIs-wrapp...

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Figure 8: Schematic diagram illustrating the difference in the amount of phosphoric acid migration from the d...

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Figure 9: (a) Raman spectra of pristine and phosphoric acid-doped PBI. (b) Ratio of relative intensities vers...

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Figure 10: (a) Schematic drawing of confocal Raman microscopy mapping. Confocal Raman maps of phosphoric-acid-...

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Figure 11: IR spectra of pristine and phosphoric-acid-doped PBI. Reprinted with permission from [29]. Copyright 19...

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Figure 12: The H₂PO₄⁻ ion under C₂_ν and C_s symmetries. These are the most probable orientations of H₂PO₄⁻ at l...

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Figure 13: (a) Coverage of different adsorbates on platinum by analyzing |POS| and |NEG| Δμ amplitudes at vari...

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Figure 14: Normalized radiographs of the cross section of the MEA at different current densities j: a) 0 mA·cm...

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Figure 15: Changes of the transmission through the MEA (grey values) compared to steady-state conditions at OC...

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Figure 16: 3D rendering of the X-ray microtomography data for the electrode cross section (a) coated electrode...

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Figure 17: Locally resolved current maps of (a) coated and (b) sprayed gas diffusion electrode measured with t...

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Review

Published 07 Jan 2015

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