Oxygen-deficient VOx integrated cobalt-nitrogen codoped carbon emerging as a sustainable bifunctional catalyst for efficient zinc-air batteries

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27640%2F25%3A10259395" target="_blank" >RIV/61989100:27640/25:10259395 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2214993725003100?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2214993725003100?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.susmat.2025.e01542" target="_blank" >10.1016/j.susmat.2025.e01542</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Oxygen-deficient VOx integrated cobalt-nitrogen codoped carbon emerging as a sustainable bifunctional catalyst for efficient zinc-air batteries

Popis výsledku v původním jazyce

Improving zinc-air batteries (ZABs) appeals for materials that hasten the two primary electrochemical reactions, especially OER and ORR. There has been significant efforts to construct non-precious metal dual functional catalysts as noble-metal catalyst alternatives. However, for these catalysts, reaching the performance levels required for ZAB commercialisation still remains an elusive goal. In this work, an interconnected oxygendeficient vanadium oxide (VOx) in proximity to (Co/Fe)-N-C sites evolving as a sustainable and efficient catalyst for ZABs has been presented. Among the synthesized materials, Co-N-C/VOx@NC demonstrates superior bifunctional ORR/OER activity at ZAB air-electrode evidenced by its lower voltage gap between ORR and OER compared to Fe-N-C/VOx@NC. According to theoretical simulations, the spectacular bifunctional performance of Co-N-C/VOx@NC was attributed to escalated charge-transfer across the active sites and favourable d-band centre alignment which improves the adsorption energy of oxygenated intermediates facilitating the reaction kinetics. Under practical ZABs operating conditions, Co-N-C/VOx@NC air electrode achieved a peak power density of 155 mW cm-2, outperforming other catalysts and furthermore yielding a specific capacity of 869.2 mAh g-1, exceeding that of PtRu/C by 1.8 % and Fe-N-C/VOx@NC by 22.5 % under similar operating conditions. Co-N-C/ VOx@NC batteries performed well after 35 h of uninterrupted operation at 5 mA cm-2, unlike PtRu/C batteries, which degraded after 600 cycles.

Název v anglickém jazyce

Oxygen-deficient VOx integrated cobalt-nitrogen codoped carbon emerging as a sustainable bifunctional catalyst for efficient zinc-air batteries

Popis výsledku anglicky

Improving zinc-air batteries (ZABs) appeals for materials that hasten the two primary electrochemical reactions, especially OER and ORR. There has been significant efforts to construct non-precious metal dual functional catalysts as noble-metal catalyst alternatives. However, for these catalysts, reaching the performance levels required for ZAB commercialisation still remains an elusive goal. In this work, an interconnected oxygendeficient vanadium oxide (VOx) in proximity to (Co/Fe)-N-C sites evolving as a sustainable and efficient catalyst for ZABs has been presented. Among the synthesized materials, Co-N-C/VOx@NC demonstrates superior bifunctional ORR/OER activity at ZAB air-electrode evidenced by its lower voltage gap between ORR and OER compared to Fe-N-C/VOx@NC. According to theoretical simulations, the spectacular bifunctional performance of Co-N-C/VOx@NC was attributed to escalated charge-transfer across the active sites and favourable d-band centre alignment which improves the adsorption energy of oxygenated intermediates facilitating the reaction kinetics. Under practical ZABs operating conditions, Co-N-C/VOx@NC air electrode achieved a peak power density of 155 mW cm-2, outperforming other catalysts and furthermore yielding a specific capacity of 869.2 mAh g-1, exceeding that of PtRu/C by 1.8 % and Fe-N-C/VOx@NC by 22.5 % under similar operating conditions. Co-N-C/ VOx@NC batteries performed well after 35 h of uninterrupted operation at 5 mA cm-2, unlike PtRu/C batteries, which degraded after 600 cycles.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Sustainable Materials and Technologies

ISSN

2214-9929

e-ISSN

2214-9937

Svazek periodika

45

Číslo periodika v rámci svazku

October

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

"nestrankovano"

Kód UT WoS článku

001540830400007

EID výsledku v databázi Scopus

2-s2.0-105011056430