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Single-source-precursor synthesized SiC-based nanocomposites with an in-situ formed Nowotny phase as multifunctional materials for electrocatalytic and electromagnetic wave absorbing applications

Feng, Yao (2021):
Single-source-precursor synthesized SiC-based nanocomposites with an in-situ formed Nowotny phase as multifunctional materials for electrocatalytic and electromagnetic wave absorbing applications. (Publisher's Version)
Darmstadt, Technische Universität,
DOI: 10.26083/tuprints-00014551,
[Ph.D. Thesis]

Abstract

This Ph.D. thesis is composed of three parts each summarizing an accepted publication. The first part is presented the Nowotny Phase (NP) embedded in a porous SiC/C nanocomposite matrix synthesized via a single-source-precursor approach involving the reaction of allylhydridopolycarbosilane with MoO2(acac)2. It is discovered for the first time that NP/C/SiC ceramic nanocomposites exhibit outstanding electrocatalytic properties suitable for the electrochemical hydrogen evolution. The second part reports how divinylbenzene (DVB) is used as a carbon-rich source to synthesize mesoporous NP/C/SiC ceramic nanocomposites with higher carbon content. The HER activity of the carbon-rich NP/C/SiC ceramic nanocomposites is further improved, due to their enhanced conductivity and high surface area. Finally, the third part of the thesis describes the discovery of interesting dielectric properties and outstanding EMA performance of the as-synthesized NP/C/SiC ceramic nanocomposites. This part is discussed also the high-temperature phase evolution of the respective nanocomposites.

Item Type: Ph.D. Thesis
Erschienen: 2021
Creators: Feng, Yao
Status: Publisher's Version
Title: Single-source-precursor synthesized SiC-based nanocomposites with an in-situ formed Nowotny phase as multifunctional materials for electrocatalytic and electromagnetic wave absorbing applications
Language: English
Abstract:

This Ph.D. thesis is composed of three parts each summarizing an accepted publication. The first part is presented the Nowotny Phase (NP) embedded in a porous SiC/C nanocomposite matrix synthesized via a single-source-precursor approach involving the reaction of allylhydridopolycarbosilane with MoO2(acac)2. It is discovered for the first time that NP/C/SiC ceramic nanocomposites exhibit outstanding electrocatalytic properties suitable for the electrochemical hydrogen evolution. The second part reports how divinylbenzene (DVB) is used as a carbon-rich source to synthesize mesoporous NP/C/SiC ceramic nanocomposites with higher carbon content. The HER activity of the carbon-rich NP/C/SiC ceramic nanocomposites is further improved, due to their enhanced conductivity and high surface area. Finally, the third part of the thesis describes the discovery of interesting dielectric properties and outstanding EMA performance of the as-synthesized NP/C/SiC ceramic nanocomposites. This part is discussed also the high-temperature phase evolution of the respective nanocomposites.

Place of Publication: Darmstadt
Collation: XIII, 94, vii Seiten
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
Date Deposited: 17 Feb 2021 09:14
DOI: 10.26083/tuprints-00014551
Official URL: https://tuprints.ulb.tu-darmstadt.de/14551
URN: urn:nbn:de:tuda-tuprints-145511
Referees: Riedel, Prof. Dr Ralf and Yu, Prof. Dr. Zhaoju and Weidenkaff, Prof. Dr. Anke
Refereed / Verteidigung / mdl. Prüfung: 26 October 2020
Alternative Abstract:
Alternative abstract Language

Diese Dissertation besteht aus drei Teilen, die jeweils eine akzeptierte Veröffentlichungen zusammenfassen. Im ersten Teil der vorliegenden Studie wird die in eine poröse SiC/C-Nanokompositmatrix eingebettete Nowotny-Phase (NP) vorgestellt. Die Synthese basiert auf einen Single-Source-Präkursor Ansatz, bei dem Allylhydridopolycarbosilan mit MoO2(acac)2 reagiert. Es ist das erste Mal, dass NP/C/SiC-Keramik-Nanokomposite hervorragende elektrokatalytische Eigenschaften aufweisen, die für die elektrochemische Wasserstoffentwicklung geeignet sind. Das zweite Teil berichtet über die Verwendung des Divinylbenzols (DVB) als kohlenstoffreiche Quelle für die Synthese von mesoporöse NP/C/SiC-Keramik-Nanokomposite mit erhöhtem Kohlenstoffgehalt. Die HER-Aktivität der kohlenstoffreichen NP/C/SiC-Keramik-Nanokomposite wurde aufgrund ihrer erweiterte Leitfähigkeit und hohe Oberfläche weiter verbessert. Schließlich beschreibt der dritte Teil der Arbeit die Entdeckung interessanter dielektrischer Eigenschaften und die hervorragende EMA-Leistung der synthetisierten NP/C/SiC-Keramik-Nanokomposite. In diesem Teil wird auch die Hochtemperaturphasenentwicklung der entsprechenden Nanokompositen diskutiert.

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