Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 16, Pages 13680-13686Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00681
Keywords
Co4Cat technology; Colloids; Nanoparticles; Cations; Alkali; Surfactant-free
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Funding
- Villum Foundation
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie [703366]
- Marie Curie Actions (MSCA) [703366] Funding Source: Marie Curie Actions (MSCA)
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The Co4Cat approach is a surfactant-free industry-relevant method to synthesize precious metal nanoparticles with enhanced catalytic properties. Colloidal nanoparticles are obtained by reduction of a metal salt in a monoalcohol such as methanol in the presence of a base. As opposed to alternative surfactant-free syntheses, in the Co4Cat approach, the nature of the alkali cations used strongly influences the most suitable strategy to achieve different nanoparticle size, to process and to stabilize surfactant-free platinum nanoparticles. The rational selection of the base needed in the Co4Cat process is detailed here. Monovalent alkali cations stabilize the as-synthesized and redispersed nanoparticles in monoalcohols and aqueous solvents with the decreasing order of efficiency: Li+> Na+ > K+ approximate to Cs+ which correlates with the decreasing hydration energy of the cation. Li+ and Na+ cations are shown to serve as simple, eco-friendly, and efficient stabilizers for surfactant-free platinum nanoparticle colloids.
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