Graphene-reinforced silicon oxycarbide composites prepared by phase transfer
The result's identifiers
Result code in 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>
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Graphene-reinforced silicon oxycarbide composites prepared by phase transfer
Original language description
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).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Carbon
ISSN
0008-6223
e-ISSN
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Volume of the periodical
139
Issue of the periodical within the volume
NOV
Country of publishing house
GB - UNITED KINGDOM
Number of pages
11
Pages from-to
813-823
UT code for WoS article
000446063100095
EID of the result in the Scopus database
2-s2.0-85053198588