Fabrication of Ni2O2(OH)/CNTs-based electrocatalyst for efficient bifunctional electrocatalytic water splitting

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F24%3AA250383U" target="_blank" >RIV/61988987:17310/24:A250383U - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0360319924005196?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0360319924005196?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ijhydene.2024.02.109" target="_blank" >10.1016/j.ijhydene.2024.02.109</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Fabrication of Ni2O2(OH)/CNTs-based electrocatalyst for efficient bifunctional electrocatalytic water splitting

Popis výsledku v původním jazyce

Exploring the cost-effective and earth-abundant electrocatalyst for efficient bifunctional activity is very challenging these days. The main reason is very slow OER (oxygen evolution reaction) kinetics as compared with HER (hydrogen evolution reaction). An electrocatalyst with enhanced kinetics towards OER and HER is highly required, which may be attributed to a larger surface area, an increased number of active sites, and lower charge transfer resistance. In this paper, we have reported a very efficient bifunctional Ni2O2(OH)/CNTs electrocatalyst by a facile ultrasonication route followed by annealing for OER/HER performance in an alkaline solution. The Ni2O2(OH)/CNTs electrocatalyst exhibits a lower overpotential of 228 mV and 270 mV during OER to accomplish a current density of 40 and 100 mAcm � 2 while it requires a 368 mV and 418 mV overpotential during HER to achieve a current density of 40 and 100 mAcm � 2. The prepared Ni2O2(OH)/CNTs electrocatalyst has a lesser Tafel slope (132 mVdec � 1; OER, 115 mVdec � 1; HER) as compared to Ni2O2(OH) (239 mVdec � 1; OER, 124 mVdec-1, HER). Ni2O2(OH)/CNTs exhibit reduced charge resistance, enhanced electrochemical active surface area, greater carrier concentration, and a higher exchange current density, which confirms its superior bifunctional electrocatalytic activity. This work provides an economical and affordable means to prepare superior, efficient bifunctional electrocatalysts for widespread commercial applications.

Název v anglickém jazyce

Fabrication of Ni2O2(OH)/CNTs-based electrocatalyst for efficient bifunctional electrocatalytic water splitting

Popis výsledku anglicky

Exploring the cost-effective and earth-abundant electrocatalyst for efficient bifunctional activity is very challenging these days. The main reason is very slow OER (oxygen evolution reaction) kinetics as compared with HER (hydrogen evolution reaction). An electrocatalyst with enhanced kinetics towards OER and HER is highly required, which may be attributed to a larger surface area, an increased number of active sites, and lower charge transfer resistance. In this paper, we have reported a very efficient bifunctional Ni2O2(OH)/CNTs electrocatalyst by a facile ultrasonication route followed by annealing for OER/HER performance in an alkaline solution. The Ni2O2(OH)/CNTs electrocatalyst exhibits a lower overpotential of 228 mV and 270 mV during OER to accomplish a current density of 40 and 100 mAcm � 2 while it requires a 368 mV and 418 mV overpotential during HER to achieve a current density of 40 and 100 mAcm � 2. The prepared Ni2O2(OH)/CNTs electrocatalyst has a lesser Tafel slope (132 mVdec � 1; OER, 115 mVdec � 1; HER) as compared to Ni2O2(OH) (239 mVdec � 1; OER, 124 mVdec-1, HER). Ni2O2(OH)/CNTs exhibit reduced charge resistance, enhanced electrochemical active surface area, greater carrier concentration, and a higher exchange current density, which confirms its superior bifunctional electrocatalytic activity. This work provides an economical and affordable means to prepare superior, efficient bifunctional electrocatalysts for widespread commercial applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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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

International Journal of Hydrogen Energy

ISSN

0360-3199

e-ISSN

1879-3487

Svazek periodika

—

Číslo periodika v rámci svazku

2024

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

601-610

Kód UT WoS článku

001202113700001

EID výsledku v databázi Scopus

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