Thermally reduced fluorographenes as efficient electrode materials for supercapacitors

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73597844" target="_blank" >RIV/61989592:15310/19:73597844 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.rsc.org/en/content/articlehtml/2019/nr/c9nr07255a" target="_blank" >https://pubs.rsc.org/en/content/articlehtml/2019/nr/c9nr07255a</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/C9NR07255A" target="_blank" >10.1039/C9NR07255A</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermally reduced fluorographenes as efficient electrode materials for supercapacitors

Popis výsledku v původním jazyce

There is an urgent need for a simple and up-scalable method for the preparation of supercapacitor electrode materials due to increasing global energy consumption worldwide. We have discovered that fluorographene exhibits great potential for the development of new kinds of supercapacitors aimed at practical applications. We have shown that time control of isothermal reduction of fluorographite at 450 degrees C under a hydrogen atmosphere led to the fine-tuning of fluorine content and electronic properties of the resulting fluorographene derivatives. Charge transfer resistances (R-ct) of the thermally reduced fluorographenes (TRFGs) were decreased with respect to the pristine fluorographene; however, the R-ct vs. time-of-reduction plot showed a v-shaped profile. The specific capacitance vs. time-of-reduction of TRFG followed the v-shaped trend, which could be the result of the decreasing content of sp(3) carbons and increasing content of structural defects. An optimized material exhibited values of specific capacitance up to 539 F g(-1) recorded at a current density of 0.25 A g(-1) and excellent cycling durability with 100% specific capacitance retention after 1500 cycles in a three-electrode configuration and 96.7% of specific capacitance after 30000 cycles in a two-electrode setup.

Název v anglickém jazyce

Thermally reduced fluorographenes as efficient electrode materials for supercapacitors

Popis výsledku anglicky

There is an urgent need for a simple and up-scalable method for the preparation of supercapacitor electrode materials due to increasing global energy consumption worldwide. We have discovered that fluorographene exhibits great potential for the development of new kinds of supercapacitors aimed at practical applications. We have shown that time control of isothermal reduction of fluorographite at 450 degrees C under a hydrogen atmosphere led to the fine-tuning of fluorine content and electronic properties of the resulting fluorographene derivatives. Charge transfer resistances (R-ct) of the thermally reduced fluorographenes (TRFGs) were decreased with respect to the pristine fluorographene; however, the R-ct vs. time-of-reduction plot showed a v-shaped profile. The specific capacitance vs. time-of-reduction of TRFG followed the v-shaped trend, which could be the result of the decreasing content of sp(3) carbons and increasing content of structural defects. An optimized material exhibited values of specific capacitance up to 539 F g(-1) recorded at a current density of 0.25 A g(-1) and excellent cycling durability with 100% specific capacitance retention after 1500 cycles in a three-electrode configuration and 96.7% of specific capacitance after 30000 cycles in a two-electrode setup.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Nanoscale

ISSN

2040-3364

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

44

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

21364-21375

Kód UT WoS článku

000503282100029

EID výsledku v databázi Scopus

2-s2.0-85074964591