Accelerated Electro-Conversion of a Nickel Coordination Complex for Hybrid Water Electrolysis
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510640" target="_blank" >RIV/00216208:11320/25:10510640 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=glVdxUnsID" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=glVdxUnsID</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/smll.202507907" target="_blank" >10.1002/smll.202507907</a>
Alternative languages
Result language
angličtina
Original language name
Accelerated Electro-Conversion of a Nickel Coordination Complex for Hybrid Water Electrolysis
Original language description
Electrocatalytic energy conversion relies on the dynamic transformation of electrode materials into "electrocatalytically active phases" under reaction conditions. Pre-catalysts, which undergo extensive structural and chemical changes during electrochemical activation, are particularly promising in this regard. In the context of electrocatalysis, coordination complexes with labile ligands offer a unique advantage, as they can rapidly reconstruct under electrochemical conditions. Herein, a hydrazine-coordinated Ni complex embedded in a conductive carbon nanotube matrix is presented as a pre-catalyst for urea-assisted hybrid water electrolysis, that transforms into highly active gamma-NiOOH nanosheets on electrochemical activation, demonstrating exceptional urea electrooxidation performance, with a low Tafel slope of 21.6 mV dec-1, a high turnover frequency (TOF) of 0.0728 s-1, and stable operation over 40 h of continuous electrolysis, reflecting superior catalytic kinetics and excellent durability. In situ synchrotron X-ray absorption, Raman, and electrochemical impedance spectroscopy reveal the dynamic evolution of active sites, the underlying reaction mechanism, and the fate of the active species after prolonged electrolysis. The integration of this pre-catalyst into an anion-exchange membrane electrolyzer highlights its potential for practical application. This work showcases the transformative role of Ni-based coordination complexes as pre-catalysts, offering an innovative blueprint for the rational design of high-performance urea oxidation electrocatalysts.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Small
ISSN
1613-6810
e-ISSN
1613-6829
Volume of the periodical
21
Issue of the periodical within the volume
41
Country of publishing house
DE - GERMANY
Number of pages
12
Pages from-to
e07907
UT code for WoS article
001560141400001
EID of the result in the Scopus database
2-s2.0-105014624699