Vertically aligned MnO2 nanosheet electrode of controllable mass loading, counter to nanoparticulate carbon film electrode for use in supercapacitor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F21%3AA2302HRR" target="_blank" >RIV/61988987:17310/21:A2302HRR - isvavai.cz</a>

Výsledek na webu

<a href="https://www.webofscience.com/wos/woscc/full-record/WOS:000599937300003" target="_blank" >https://www.webofscience.com/wos/woscc/full-record/WOS:000599937300003</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Vertically aligned MnO2 nanosheet electrode of controllable mass loading, counter to nanoparticulate carbon film electrode for use in supercapacitor

Popis výsledku v původním jazyce

MnO2 electrode with nanosheet morphology, counter to carbon electrode in a supercapacitor shows promise for energy storage application. In this investigation, film electrodes of Mn-oxide and carbon with much higher and controllable mass loadings are grown by electrospray of respective precursors on Ni foam substrates. The electrospray deposition is conducted at room temperature to simplify the procedure. The evolution of nanosheet morphology of the Mn-oxide film due to electrochemical oxidation of Mn (II, III) to Mn (IV) valence state, implemented by multiple cyclic voltammetry (mCV) cycles on the calcined film is studied here. The CV and the charge-discharge curve show near-ideal behaviour with 0.5 M K2SO4 as electrolyte in asymmetric set-up, logging a capacitance of 115 F g(-1) at 1 mA cm(-2). The capacitance is retained to 93% of initial value after 5000 cycles at 20 mA cm(-2). The specific energy and power are found to the levels of 62.3 Wh kg(-1) and 5.2 kW kg(-1) respectively, which appear promising in comparison to the values, reported in literature. The increase in calcination temperature from 350 degrees C to 500 degrees C resulted in interspersed agglomeration within nanosheet morphology after mCV cycles, and consequent loss of capacitance.

Název v anglickém jazyce

Vertically aligned MnO2 nanosheet electrode of controllable mass loading, counter to nanoparticulate carbon film electrode for use in supercapacitor

Popis výsledku anglicky

MnO2 electrode with nanosheet morphology, counter to carbon electrode in a supercapacitor shows promise for energy storage application. In this investigation, film electrodes of Mn-oxide and carbon with much higher and controllable mass loadings are grown by electrospray of respective precursors on Ni foam substrates. The electrospray deposition is conducted at room temperature to simplify the procedure. The evolution of nanosheet morphology of the Mn-oxide film due to electrochemical oxidation of Mn (II, III) to Mn (IV) valence state, implemented by multiple cyclic voltammetry (mCV) cycles on the calcined film is studied here. The CV and the charge-discharge curve show near-ideal behaviour with 0.5 M K2SO4 as electrolyte in asymmetric set-up, logging a capacitance of 115 F g(-1) at 1 mA cm(-2). The capacitance is retained to 93% of initial value after 5000 cycles at 20 mA cm(-2). The specific energy and power are found to the levels of 62.3 Wh kg(-1) and 5.2 kW kg(-1) respectively, which appear promising in comparison to the values, reported in literature. The increase in calcination temperature from 350 degrees C to 500 degrees C resulted in interspersed agglomeration within nanosheet morphology after mCV cycles, and consequent loss of capacitance.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10400 - Chemical sciences

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Journal of Energy Storage

ISSN

2352-152X

e-ISSN

2352-152X

Svazek periodika

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Číslo periodika v rámci svazku

101851

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

33-41

Kód UT WoS článku

000599937300003

EID výsledku v databázi Scopus

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