Dual-Atom Co/Ni Electrocatalyst Anchored at the Surface-Modified Ti3C2T x MXene Enables Efficient Hydrogen and Oxygen Evolution Reactions
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F24%3A10254880" target="_blank" >RIV/61989100:27740/24:10254880 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acsnano.3c09639" target="_blank" >https://pubs.acs.org/doi/10.1021/acsnano.3c09639</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acsnano.3c09639" target="_blank" >10.1021/acsnano.3c09639</a>
Alternative languages
Result language
angličtina
Original language name
Dual-Atom Co/Ni Electrocatalyst Anchored at the Surface-Modified Ti3C2T x MXene Enables Efficient Hydrogen and Oxygen Evolution Reactions
Original language description
Dual-atom catalytic sites on conductive substrates offer a promising opportunity for accelerating the kinetics of multistep hydrogen and oxygen evolution reactions (HER and OER, respectively). Using MXenes as substrates is a promising strategy for depositing those dual-atom electrocatalysts, if the efficient surface anchoring strategy ensuring metal-substrate interactions and sufficient mass loading is established. We introduce a surface-modification strategy of MXene substrates by preadsorbing L-tryptophan molecules, which enabled attachment of dual-atom Co/Ni electrocatalyst at the surface of Ti3C2Tx by forming N-Co/Ni-O bonds, with mass loading reaching as high as 5.6 wt %. The electron delocalization resulting from terminated O atoms on MXene substrates, N atoms in L-tryptophan anchoring moieties, and catalytic metal atoms Co and Ni provides an optimal adsorption strength of intermediates and boosts the HER and OER kinetics, thereby notably promoting the intrinsic activity of the electrocatalyst. CoNi-Ti3C2Tx electrocatalyst displayed HER and OER overpotentials of 31 and 241 mV at 10 mA cm(-2), respectively. Importantly, the CoNi-Ti3C2Tx electrocatalyst also exhibited high operational stability for both OER and HER over 100 h at an industrially relevant current density of 500 mA cm(-2). Our study provided guidance for constructing dual-atom active metal sites on MXene substrates to synergistically enhance the electrochemical efficiency and stability of the energy conversion and storage systems.
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
10400 - Chemical sciences
Result continuities
Project
—
Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ACS Nano
ISSN
1936-0851
e-ISSN
1936-086X
Volume of the periodical
18
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
13
Pages from-to
4256-4268
UT code for WoS article
001158578900001
EID of the result in the Scopus database
2-s2.0-85184292373