Feng, Yao ; Yu, Zhaoju ; Schuch, Jona ; Tao, Shasha ; Wiehl, Leonore ; Fasel, Claudia ; Jaegermann, Wolfram ; Riedel, Ralf (2020):
Nowotny phase Mo3+2xSi3C0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction.
In: Journal of the American Ceramic Society, 103 (1), pp. 508-519. Wiley, ISSN 00027820,
DOI: 10.1111/jace.16731,
[Article]
Abstract
The ternary Nowotny phase (NP), with a composition Mo3+2xSi3C0.6 (x = 0.9‐0.764), is found to be catalytically active in the field of electrochemical water splitting. The NP embedded in a porous SiC/C nanocomposite matrix is synthesized via a single‐source‐precursor approach which involves the reaction of allylhydridopolycarbosilane with MoO2(acac)2. Thermal treatment of the single‐source‐precursor up to 1400°C in a protective atmosphere results in the in situ formation of nanocrystalline Mo3+2xSi3C0.6 immobilized in a thermally and corrosion‐stable SiC/C matrix. The weight fractions of the observed crystalline phases Mo3+2xSi3C0.6 and SiC amount to ca. 28 (26) and 72 (74) wt%, respectively, when prepared at 1400°C (1350°C). The porosity of the formed nanocomposite is adjusted by the addition of polystyrene (PS) as a pore former to the single‐source‐precursor resulting in a specific surface area up to 206 m2/g. The electrocatalytic activity of the Mo3+2xSi3C0.6/C/SiC nanocomposite with respect to the hydrogen evolution reaction (HER) is characterized by low over potentials of 22 and 138 mV vs reversible hydrogen electrode (RHE) for applying 1 and 10 mA cm−2 of current density, respectively. The analyzed electrocatalytic performance exceeds that of most Mo‐based electrocatalysts and shows high stability (over 90%) during 35 hours.
| Item Type: | Article |
|---|---|
| Erschienen: | 2020 |
| Creators: | Feng, Yao ; Yu, Zhaoju ; Schuch, Jona ; Tao, Shasha ; Wiehl, Leonore ; Fasel, Claudia ; Jaegermann, Wolfram ; Riedel, Ralf |
| Title: | Nowotny phase Mo3+2xSi3C0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction |
| Language: | English |
| Abstract: | The ternary Nowotny phase (NP), with a composition Mo3+2xSi3C0.6 (x = 0.9‐0.764), is found to be catalytically active in the field of electrochemical water splitting. The NP embedded in a porous SiC/C nanocomposite matrix is synthesized via a single‐source‐precursor approach which involves the reaction of allylhydridopolycarbosilane with MoO2(acac)2. Thermal treatment of the single‐source‐precursor up to 1400°C in a protective atmosphere results in the in situ formation of nanocrystalline Mo3+2xSi3C0.6 immobilized in a thermally and corrosion‐stable SiC/C matrix. The weight fractions of the observed crystalline phases Mo3+2xSi3C0.6 and SiC amount to ca. 28 (26) and 72 (74) wt%, respectively, when prepared at 1400°C (1350°C). The porosity of the formed nanocomposite is adjusted by the addition of polystyrene (PS) as a pore former to the single‐source‐precursor resulting in a specific surface area up to 206 m2/g. The electrocatalytic activity of the Mo3+2xSi3C0.6/C/SiC nanocomposite with respect to the hydrogen evolution reaction (HER) is characterized by low over potentials of 22 and 138 mV vs reversible hydrogen electrode (RHE) for applying 1 and 10 mA cm−2 of current density, respectively. The analyzed electrocatalytic performance exceeds that of most Mo‐based electrocatalysts and shows high stability (over 90%) during 35 hours. |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Journal Volume: | 103 |
| Issue Number: | 1 |
| Publisher: | Wiley |
| Uncontrolled Keywords: | Ceramic nanocomposites; electrocatalytic activity; hydrogen evolution reaction; Nowotny phase; single-source-precursor; Molybdenum phosphide nanoparticles; efficient electrocatalyst; carbon nanotubes, carbide; composites; ceramics |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids 11 Department of Materials and Earth Sciences > Material Science > Surface Science |
| Date Deposited: | 30 Oct 2019 07:53 |
| DOI: | 10.1111/jace.16731 |
| URL / URN: | https://ceramics.onlinelibrary.wiley.com/doi/full/10.1111/ja... |
| Projects: | China Scholarship Council, Grant Number: 201606310021, National Natural Science Foundation of China, Grant Number: 51872246, Alexander von Humboldt Foundation, Creative Research Foundation of Science, Technology on Thermostructural Composite Materials Laboratory, Grant Number: 6142911040114 |
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