Direct immobilization of an atomically dispersed Pt catalyst by suppressing heterogeneous nucleation at 40 C

Direct deposition of isolated metal atoms onto substrates has been recognized as a simple route to obtain high performance supported atomically dispersed metals (SACs), however, the agglomeration driven by high surface energy is difficult to avoid. Herein, we demonstrate a one-pot solution synthesis...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (45), p.25779-25784
Main Authors: Huang, Kai, Wang, Ruyue, Wu, Hongbo, Wang, Hao, He, Xian, Wei, Hehe, Wang, Shanpeng, Zhang, Ru, Lei, Ming, Guo, Wei, Ge, Binghui, Wu, Hui
Format: Article
Language:English
Subjects:
Accelerated tests
Carbon
Catalysts
Chemical synthesis
Dispersion
Durability
Electrochemistry
Heavy metals
Hydrogen evolution reactions
Immobilization
Nanoparticles
Nitrogen
Nucleation
Platinum
Reaction kinetics
Substrates
Surface energy
Surface properties
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Summary:Direct deposition of isolated metal atoms onto substrates has been recognized as a simple route to obtain high performance supported atomically dispersed metals (SACs), however, the agglomeration driven by high surface energy is difficult to avoid. Herein, we demonstrate a one-pot solution synthesis to obtain atomically dispersed platinum (Pt) supported on nitrogen (N)-doped mesoporous carbon (NMC) substrates (Pt/NMC-LT) by conducting the whole synthesis at 40 C, owing to the sluggish nucleation kinetics. We obtained the Pt/NMC-LT catalyst with superior electrochemical hydrogen evolution reaction (HER) activity and stability, in comparison with the NMC supported dominant Pt sub-nanometer cluster catalyst from solution synthesis at RT 25 C (Pt/NMC-RT) and commercial carbon supported Pt nanoparticle catalysts (Pt/C). Lower over-potential values (only 17.0 and 49.8 mV) are needed for high HER current densities (10 and 100 mA cm 2 , respectively), and no obvious degradation is observed after an accelerated durability test (ADT) for 5000 CV cycles. Direct deposition of isolated metal atoms onto substrates has been recognized as a simple route to obtain high performance supported atomically dispersed metals (SACs), however, the agglomeration driven by high surface energy is difficult to avoid.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta07469d