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2 article(s) from Wöhrl, Nicolas

One-step synthesis of carbon-supported electrocatalysts

Sebastian Tigges,
Nicolas Wöhrl,
Ivan Radev,
Ulrich Hagemann,
Markus Heidelmann,
Thai Binh Nguyen,
Stanislav Gorelkov,
Stephan Schulz and
Axel Lorke

Beilstein J. Nanotechnol. 2020, 11, 1419–1431, doi:10.3762/bjnano.11.126

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Figure 1: Schematic illustration of the deposition process. Platinum acetylacetonate is dissociated by the pl...

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Figure 2: a) Bright-field TEM micrograph of a typical Pt/CNW sheet, showing homogeneously distributed Pt-NPs ...

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Figure 3: TEM micrographs of Pt-NPs (blue) at the edge of a CNW sheet. The carbon layers (green) are disturbe...

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Figure 4: SEM images of selected CNW morphologies of samples processed at varying process parameters: a) argo...

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Figure 5: XPS a) survey and elemental scans of b) the slightly oxidized sample P7 and c) the highly oxidized ...

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Figure 6: The dependence of mean particle diameter and geometric standard deviation on platinum loading of th...

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Figure 7: ECSA maximum (columns) and ECSA initial values (red, dashed line, if the ECSA_initial < ECSA_max.) fo...

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Figure 8: Normalized ECSA as a function of the AST cycles measured by CV. The superior long-term stability of...

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Full Research Paper

Published 17 Sep 2020

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Synthesis of carbon nanowalls from a single-source metal-organic precursor

André Giese,
Sebastian Schipporeit,
Volker Buck and
Nicolas Wöhrl

Beilstein J. Nanotechnol. 2018, 9, 1895–1905, doi:10.3762/bjnano.9.181

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Figure 1: Three-stage model of CNW growth (adapted from Kondo and co-workers) [18].

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Figure 2: Schematic diagram of ICP-PECVD plasma source.

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Figure 3: SEM images. Sampe 1 deposited at 350 °C and 0 V bias voltage: nanorods; sample 2 deposited at 350 °...

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Figure 4: SEM images. Sample 3 deposited at 425 °C and −30 V bias voltage: straight CNWs; sample 2 deposited ...

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Figure 5: Growth zones of CNW growth: nanorods (low energies), thorny structures and straight CNWs (medium en...

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Figure 6: Growth zones on different substrate materials as a function of substrate temperature and bias volta...

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Figure 7: Typical Raman spectra and the I_D/I_G ratios for a) nanorods, b) thorny CNWs, c) straight CNWs and d)...

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Figure 8: I_D/I_G ratio as a function of the mean wall length of the straight and the curled CNWs on a) stainle...

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Figure 9: Heights of CNWs as a function of process parameters and substrate material.

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Figure 10: a) SEM image of the curled CNWs and corresponding b) carbon and c) aluminium mappings, as measured ...

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Figure 11: EDX spectrum of CNWs on stainless steel (Fe, Cr). Besides carbon and aluminium, oxygen can be found...

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Full Research Paper

Published 29 Jun 2018

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