Investigating the Influence of Sodium Preintercalation on the Electrochemical Behavior of Ultrathin MnO2 Nanowires for Enhanced Supercapacitor Performance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F24%3AA25037US" target="_blank" >RIV/61988987:17310/24:A25037US - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.acs.org/doi/10.1021/acs.energyfuels.3c04027" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.energyfuels.3c04027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.energyfuels.3c04027" target="_blank" >10.1021/acs.energyfuels.3c04027</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Investigating the Influence of Sodium Preintercalation on the Electrochemical Behavior of Ultrathin MnO2 Nanowires for Enhanced Supercapacitor Performance

Popis výsledku v původním jazyce

We have successfully synthesized bare and Na+ preintercalated MnO2 nanowires (NWs) (NaxMnO2, x = 0.05, 0.1, and 0.15) using a facile hydrothermal method. Supercapacitors are the state-of-the-art technology to overcome the global energy crisis, owing to their fast charging/discharging rates and higher power density. One-dimensional morphology (nanorods, nanowires, etc.) boosts the inherent low conductivity of transition metal oxides including MnO2 by confining charge transport only in one direction. Here, we have preintercalated Na+ ions into MnO2 nanowires (NWs) as a conductivity booster as well as a tunnel-stabilizing agent for alpha-MnO2. Morphological analysis reveals that nanowires have <50 nm diameter and their surface gets cracked with Na+ preintercalation, offering a less dead area. Linear sweep voltammetry (LSV) results revealed an increase in oxygen evolution overpotential by Na+ preintercalation, which can enable the supercapacitor to operate at an extended potential window. Na+ preintercalation and control on morphology not only increased the conductivity but also shielded the electrode pulverization against tedious charging/discharging cycles and reduced the electrolyte diffusion pathway. These features enabled Na0.10MnO2 NWs to exhibit a specific capacitance of 1061 F g(-1)@1 A g(-1) and an excellent rate capability of 85.6% at 9 A g(-1) along with 95.9% capacitance retention after 6000 charging-discharging cycles at 12 A g(-1) current density. This study showed that Na+ preintercalation in MnO2 could improve the electrochemical performance and open up new horizons to manufacture high-performance next-generation supercapacitors.

Název v anglickém jazyce

Investigating the Influence of Sodium Preintercalation on the Electrochemical Behavior of Ultrathin MnO2 Nanowires for Enhanced Supercapacitor Performance

Popis výsledku anglicky

We have successfully synthesized bare and Na+ preintercalated MnO2 nanowires (NWs) (NaxMnO2, x = 0.05, 0.1, and 0.15) using a facile hydrothermal method. Supercapacitors are the state-of-the-art technology to overcome the global energy crisis, owing to their fast charging/discharging rates and higher power density. One-dimensional morphology (nanorods, nanowires, etc.) boosts the inherent low conductivity of transition metal oxides including MnO2 by confining charge transport only in one direction. Here, we have preintercalated Na+ ions into MnO2 nanowires (NWs) as a conductivity booster as well as a tunnel-stabilizing agent for alpha-MnO2. Morphological analysis reveals that nanowires have <50 nm diameter and their surface gets cracked with Na+ preintercalation, offering a less dead area. Linear sweep voltammetry (LSV) results revealed an increase in oxygen evolution overpotential by Na+ preintercalation, which can enable the supercapacitor to operate at an extended potential window. Na+ preintercalation and control on morphology not only increased the conductivity but also shielded the electrode pulverization against tedious charging/discharging cycles and reduced the electrolyte diffusion pathway. These features enabled Na0.10MnO2 NWs to exhibit a specific capacitance of 1061 F g(-1)@1 A g(-1) and an excellent rate capability of 85.6% at 9 A g(-1) along with 95.9% capacitance retention after 6000 charging-discharging cycles at 12 A g(-1) current density. This study showed that Na+ preintercalation in MnO2 could improve the electrochemical performance and open up new horizons to manufacture high-performance next-generation supercapacitors.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10400 - Chemical sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

ENERG FUEL

ISSN

0887-0624

e-ISSN

1520-5029

Svazek periodika

—

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

5506-5521

Kód UT WoS článku

001181858100001

EID výsledku v databázi Scopus

2-s2.0-85187372782