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In this paper, W-containing SiC-based ceramic nanocomposites were successfully prepared by a polymer-derived ceramic approach using allylhydridopolycarbosilane (AHPCS) as a SiC source, WCl6 as a tungsten source, polystyrene (PS) as a pore forming agent as well as divinyl benzene (DVB) as a carbon rich source. High-temperature phase behavior of the W-containing SiC-based ceramics after heat treatment was studied, showing that excessive DVB content in the feed will inhibit the crystallinity of W-containing nanoparticles in the final ceramic nanocomposites. The high specific surface area (SSA) of 169.4-276.9 m2/g can be maintained even at high temperature in the range of 1400-1500 ℃, due to the carbothermal reaction which usually occurs between 1300 and 1400 ℃. All prepared W-containing SiC-based nanocomposites reveal electrocatalytic activity for the hydrogen evolution reaction (HER). In detail, compared with reversible hydrogen electrode (RHE), the ceramic sample PWA-2-1300 after heat treatment at 1300 ℃ has the smallest overpotential of 286 mV when the current density is 10 mA·cm-2 in acid medium, indicating the promising perspective in the water splitting field.


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Single-source-precursor synthesis of porous W-containing SiC-based nanocomposites as hydrogen evolution reaction electrocatalysts

Show Author's information Zhaoju YUa( )Kangwei MAOaYao FENGb,c( )
College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China
Technische Universität Darmstadt, Institut für Materialwissenschaft, Otto-Berndt-Straße 3, D-64287, Darmstadt, Germany
College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China

Abstract

In this paper, W-containing SiC-based ceramic nanocomposites were successfully prepared by a polymer-derived ceramic approach using allylhydridopolycarbosilane (AHPCS) as a SiC source, WCl6 as a tungsten source, polystyrene (PS) as a pore forming agent as well as divinyl benzene (DVB) as a carbon rich source. High-temperature phase behavior of the W-containing SiC-based ceramics after heat treatment was studied, showing that excessive DVB content in the feed will inhibit the crystallinity of W-containing nanoparticles in the final ceramic nanocomposites. The high specific surface area (SSA) of 169.4-276.9 m2/g can be maintained even at high temperature in the range of 1400-1500 ℃, due to the carbothermal reaction which usually occurs between 1300 and 1400 ℃. All prepared W-containing SiC-based nanocomposites reveal electrocatalytic activity for the hydrogen evolution reaction (HER). In detail, compared with reversible hydrogen electrode (RHE), the ceramic sample PWA-2-1300 after heat treatment at 1300 ℃ has the smallest overpotential of 286 mV when the current density is 10 mA·cm-2 in acid medium, indicating the promising perspective in the water splitting field.

Keywords:

single-source-precursor, W-containing phase, SiC-based nanocomposites, electrocatalyst, hydrogen evolution reaction
Received: 17 February 2021 Revised: 08 June 2021 Accepted: 11 June 2021 Published: 04 August 2021 Issue date: December 2021
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Publication history

Received: 17 February 2021
Revised: 08 June 2021
Accepted: 11 June 2021
Published: 04 August 2021
Issue date: December 2021

Copyright

© The Author(s) 2021

Acknowledgements

Zhaoju Yu thanks the National Natural Science Foundation of China (Nos. 51872246 and 52061135102) for financial support.

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