Graphene-reinforced silicon oxycarbide composites prepared by phase transfer

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00494397" target="_blank" >RIV/68081723:_____/18:00494397 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.carbon.2018.07.042" target="_blank" >http://dx.doi.org/10.1016/j.carbon.2018.07.042</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.carbon.2018.07.042" target="_blank" >10.1016/j.carbon.2018.07.042</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Graphene-reinforced silicon oxycarbide composites prepared by phase transfer

Popis výsledku v původním jazyce

In order to compensate for cracking, brittleness and low electrical conductivity of polymer-derived silicon oxycarbide (SiOC), graphene was successfully introduced into a SiOC matrix by phase transfer of graphene oxide (GO) from an aqueous (GO dispersed in water) to organic phase (copolymer as SiOC precursor in diethyl ether). Spark plasma sintering (SPS) was used to fully densify composites to ~2.3g/ cm3. The prepared materials were comprehensively characterized and exhibited significant enhancement in the mechanical properties, electrical conductivity and electrochemical performance. Self-assembled lamellar structure of graphene in the SiOC-matrix was achieved, leading to anisotropy in the properties of the composites. The fracture toughness of the SiOC-2vol%GO composite was increased by ~91%, at the expense of a slight decrease in the flexural strength, compared to the SiOC-matrix. Moreover, the composites exhibited three orders higher electrical conductivity than the SiOC-matrix. The electrical conductivity in the perpendicular direction (s┴ Ľ 3 _ 10_1S/cm) of SiOC-2vol%GO composites was two orders of magnitude higher than that in the parallel direction (sk Ľ 4.7 _ 10_3S/cm), owing to the selfassembled lamellar graphene in the SiOC-matrix. The SiOC-2vol%GO composites further showed Berger electrochemical performance of oxygen reduction reaction (ORR) than pure graphene, exhibiting an onset potential (~0.75 V vs RHE) and more positive half-wave potential (~0.6 V vs RHE).

Název v anglickém jazyce

Graphene-reinforced silicon oxycarbide composites prepared by phase transfer

Popis výsledku anglicky

In order to compensate for cracking, brittleness and low electrical conductivity of polymer-derived silicon oxycarbide (SiOC), graphene was successfully introduced into a SiOC matrix by phase transfer of graphene oxide (GO) from an aqueous (GO dispersed in water) to organic phase (copolymer as SiOC precursor in diethyl ether). Spark plasma sintering (SPS) was used to fully densify composites to ~2.3g/ cm3. The prepared materials were comprehensively characterized and exhibited significant enhancement in the mechanical properties, electrical conductivity and electrochemical performance. Self-assembled lamellar structure of graphene in the SiOC-matrix was achieved, leading to anisotropy in the properties of the composites. The fracture toughness of the SiOC-2vol%GO composite was increased by ~91%, at the expense of a slight decrease in the flexural strength, compared to the SiOC-matrix. Moreover, the composites exhibited three orders higher electrical conductivity than the SiOC-matrix. The electrical conductivity in the perpendicular direction (s┴ Ľ 3 _ 10_1S/cm) of SiOC-2vol%GO composites was two orders of magnitude higher than that in the parallel direction (sk Ľ 4.7 _ 10_3S/cm), owing to the selfassembled lamellar graphene in the SiOC-matrix. The SiOC-2vol%GO composites further showed Berger electrochemical performance of oxygen reduction reaction (ORR) than pure graphene, exhibiting an onset potential (~0.75 V vs RHE) and more positive half-wave potential (~0.6 V vs RHE).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Carbon

ISSN

0008-6223

e-ISSN

—

Svazek periodika

139

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

813-823

Kód UT WoS článku

000446063100095

EID výsledku v databázi Scopus

2-s2.0-85053198588