Densely Functionalized Cyanographene Bypasses Aqueous Electrolytes and Synthetic Limitations Toward Seamless Graphene/beta-FeOOH Hybrids for Supercapacitors

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73600631" target="_blank" >RIV/61989592:15310/19:73600631 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/epdf/10.1002/adfm.201906998" target="_blank" >https://onlinelibrary.wiley.com/doi/epdf/10.1002/adfm.201906998</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/adfm.201906998" target="_blank" >10.1002/adfm.201906998</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Densely Functionalized Cyanographene Bypasses Aqueous Electrolytes and Synthetic Limitations Toward Seamless Graphene/beta-FeOOH Hybrids for Supercapacitors

Popis výsledku v původním jazyce

Supercapacitors are a promising energy storage technology owing to their unparalleled power and lifetime. However, to meet the continuously rising demands of energy storage, they must be equipped with higher energy densities. For this purpose, the seamless integration of metal oxides on carbon matrices, such as iron oxides/oxyhydroxides, has been pursued through hydrothermal, atomic layer and electro-deposition methods directly on current collectors. Nevertheless, such methods present limited compatibility with commercial paste-coating processes on the current collectors. Furthermore, iron oxides/oxyhydroxides lack conductivity and are hydrophilic, operating with low-voltage aqueous electrolytes, limiting their power and energy and requiring corrosion-resistant H2O current collectors. To mitigate these challenges, a seamless and paste-ready material is successfully developed through a 15 min wet-chemical method, via the coordination of ultrasmall beta-FeOOH (akaganeite) nanoparticles to the nitrile groups of a covalent graphene derivative. Endowed with graphene-like impedance response and very high wettability in organic electrolytes, combined high power and energy densities are obtained, with respect to the total mass of both electrode materials and current collectors, overcoming the identified challenges. This offers future prospects for the exploration of alternative molecular handles for improved interfaces and their application in different energy-storage chemistries.

Název v anglickém jazyce

Densely Functionalized Cyanographene Bypasses Aqueous Electrolytes and Synthetic Limitations Toward Seamless Graphene/beta-FeOOH Hybrids for Supercapacitors

Popis výsledku anglicky

Supercapacitors are a promising energy storage technology owing to their unparalleled power and lifetime. However, to meet the continuously rising demands of energy storage, they must be equipped with higher energy densities. For this purpose, the seamless integration of metal oxides on carbon matrices, such as iron oxides/oxyhydroxides, has been pursued through hydrothermal, atomic layer and electro-deposition methods directly on current collectors. Nevertheless, such methods present limited compatibility with commercial paste-coating processes on the current collectors. Furthermore, iron oxides/oxyhydroxides lack conductivity and are hydrophilic, operating with low-voltage aqueous electrolytes, limiting their power and energy and requiring corrosion-resistant H2O current collectors. To mitigate these challenges, a seamless and paste-ready material is successfully developed through a 15 min wet-chemical method, via the coordination of ultrasmall beta-FeOOH (akaganeite) nanoparticles to the nitrile groups of a covalent graphene derivative. Endowed with graphene-like impedance response and very high wettability in organic electrolytes, combined high power and energy densities are obtained, with respect to the total mass of both electrode materials and current collectors, overcoming the identified challenges. This offers future prospects for the exploration of alternative molecular handles for improved interfaces and their application in different energy-storage chemistries.

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)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

ADVANCED FUNCTIONAL MATERIALS

ISSN

1616-301X

e-ISSN

—

Svazek periodika

29

Číslo periodika v rámci svazku

51

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

11

Strana od-do

"1906998-1"-"1906998-11"

Kód UT WoS článku

000516572400027

EID výsledku v databázi Scopus

2-s2.0-85074032935