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Nowotny phase Mo3+2xSi3C0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

Feng, Yao and Yu, Zhaoju and Schuch, Jona and Tao, Shasha and Wiehl, Leonore and Fasel, Claudia and Jaegermann, Wolfram and Riedel, Ralf (2020):
Nowotny phase Mo3+2xSi3C0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction.
103, In: Journal of the American Ceramic Society, (1), Wiley, pp. 508-519, ISSN 00027820, DOI: 10.1111/jace.16731,
[Online-Edition: https://ceramics.onlinelibrary.wiley.com/doi/full/10.1111/ja...],
[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 and Yu, Zhaoju and Schuch, Jona and Tao, Shasha and Wiehl, Leonore and Fasel, Claudia and Jaegermann, Wolfram and 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
Volume: 103
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
Official URL: 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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