Rational design of crystalline/amorphous nickel manganese phosphate octahydrate heterostructure for high-performance aqueous and all-solid-state asymmetric supercapacitors

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10478942" target="_blank" >RIV/00216208:11310/24:10478942 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/24:43929952

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=spiVHmGZcg" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=spiVHmGZcg</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cej.2024.148895" target="_blank" >10.1016/j.cej.2024.148895</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Rational design of crystalline/amorphous nickel manganese phosphate octahydrate heterostructure for high-performance aqueous and all-solid-state asymmetric supercapacitors

Popis výsledku v původním jazyce

Designing a rational architecture and combining diverse metal cations are of vital importance to obtain highperformance bimetallic compounds for energy storage purposes. Herein, a novel crystalline/amorphous nickel manganese phosphate octahydrate heterostructure grown in-situ on nickel foam was synthesized by a facile hydrothermal method followed by annealing in argon. The composite exhibits exceptional performance by adjusting the atomic ratio of redox metals (nickel and manganese) with multiple oxidation states. Specifically, the composite shows an excellent specific capacitance of 2351.6 F g-1 at a current density of 1 A g-1 and 67.3 % capacity retention after 3000 cycles at 10 A g-1. This remarkable performance can be attributed to the unique heterogeneous structure of the composite and the synergistic effect between two metals, improving the electronic conductivity. Density functional theory (DFT) calculations further confirm the reduction of band gap and conductivity enhancement. Furthermore, the crystalline portions offer not only active sites but also good mechanical support, while the amorphous components effectively promote ion diffusion and reaction. An aqueous asymmetric supercapacitor was assembled employing nickel manganese phosphate octahydrate as cathode and active carbon as anode, displaying a high energy density of 66.22 Wh kg -1 at a power density of 400 W kg -1 and outstanding cycling performance at 60 mA cm -2 (81.03 % capacitance retention after 15,000 cycles). Additionally, the fabricated all -solid -state asymmetric supercapacitor also displays a remarkable electrochemical performance.

Název v anglickém jazyce

Rational design of crystalline/amorphous nickel manganese phosphate octahydrate heterostructure for high-performance aqueous and all-solid-state asymmetric supercapacitors

Popis výsledku anglicky

Designing a rational architecture and combining diverse metal cations are of vital importance to obtain highperformance bimetallic compounds for energy storage purposes. Herein, a novel crystalline/amorphous nickel manganese phosphate octahydrate heterostructure grown in-situ on nickel foam was synthesized by a facile hydrothermal method followed by annealing in argon. The composite exhibits exceptional performance by adjusting the atomic ratio of redox metals (nickel and manganese) with multiple oxidation states. Specifically, the composite shows an excellent specific capacitance of 2351.6 F g-1 at a current density of 1 A g-1 and 67.3 % capacity retention after 3000 cycles at 10 A g-1. This remarkable performance can be attributed to the unique heterogeneous structure of the composite and the synergistic effect between two metals, improving the electronic conductivity. Density functional theory (DFT) calculations further confirm the reduction of band gap and conductivity enhancement. Furthermore, the crystalline portions offer not only active sites but also good mechanical support, while the amorphous components effectively promote ion diffusion and reaction. An aqueous asymmetric supercapacitor was assembled employing nickel manganese phosphate octahydrate as cathode and active carbon as anode, displaying a high energy density of 66.22 Wh kg -1 at a power density of 400 W kg -1 and outstanding cycling performance at 60 mA cm -2 (81.03 % capacitance retention after 15,000 cycles). Additionally, the fabricated all -solid -state asymmetric supercapacitor also displays a remarkable electrochemical performance.

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

2024

Kód důvěrnosti údajů

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

Název periodika

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

1873-3212

Svazek periodika

482

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

148895

Kód UT WoS článku

001171605800001

EID výsledku v databázi Scopus

2-s2.0-85184067441