Spontaneous linker-free binding of polyoxometalates on nitrogen-doped carbon nanotubes for efficient water oxidation

Title
Spontaneous linker-free binding of polyoxometalates on nitrogen-doped carbon nanotubes for efficient water oxidation
Authors
오영탁이길용김인수임준원양문영최동성구유진강석훈남윤성김상욱
Issue Date
2017-02
Publisher
Journal of materials chemistry. A, Materials for energy and sustainability
Citation
VOL 5-1947
Abstract
Efficient water oxidation remains a principal challenge for clean fuels via water splitting. Polyoxometalates (POMs) are promising water oxidation catalysts in a neutral medium but their application is commonly limited by low electrical conductivity and poor adhesiveness arising from bulky and electrically insulating ligands. Here we report linker-free spontaneous binding of tetracobalt-based polyoxometalates (Co4POMs) on nitrogen-doped carbon nanotubes (NCNTs) via electrostatic hybridization. Protonated nitrogen-dopant sites at NCNTs enable linker-free immobilization of the Co4POMs and fluent electron transfer in the resultant Co4POM/NCNT hybrid structures, as demonstrated by the low overpotential of 370 mV for the water oxidation at pH 7. Accordingly, the hybrids exhibit fast reaction kinetics with a turnover frequency of 0.211 s− 1 at 2.01 V vs. RHE. Density functional theory calculation proposes that POMs vertically align at the NCNT surface exposing the maximal catalytic surfaces. This work suggests a reliable route to highly efficient water oxidation catalysis by employing POMs under neutral conditions and NCNTs as self-binding nanoelectrodes in a synergistic well-oriented hybrid structure.
URI
http://pubs.kist.re.kr/handle/201004/71063
ISSN
2050-7488
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KIST Publication > Article
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