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Sulfur-doped graphene anchoring of ultrafine Au25 nanoclusters for electrocatalysis

Nano Research 2021年第10期14卷 3509-3513页

作者： Mufan Li Bei Zhang Tao Cheng sunmoon yu Sheena Louisia Chubai Chen Shouping Chen Stefano Cestellos-Blanco William AGoddard III Peidong Yang Department of Chemistry University of CaliforniaBerkeleyCalifornia 94720USA Department of Materials Science and Engineering University of CaliforniaBerkeleyCalifornia 94720USA Chemical Science Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Kavli Energy NanoScience Institute BerkeleyCalifornia 94720USA Materials and Process Simulation Center California Institute of TechnologyPasadenaCalifornia 91125USA

The biggest challenge of exploring the catalytic properties of under-coordinated nanoclusters is the issue of *** demonstrate herein that chemical dopants on sulfur-doped graphene(S-G)can be utilized to stabilize ultrafine(sub-2 nm)Au_(25)(PET)18 clusters to enable stable nitrogen reduction reaction(NRR)without significant structural *** Au_(25)@S-G exhibits an ammonia yield rate of 27.5μgNH_(3)·mgAu^(-1)·h^(-1)at-0.5 V with faradic efficiency of 2.3%.More importantly,the anchored clusters preserve~80%NRR activity after four days of continuous operation,a significant improvement over the 15%remaining ammonia production rate for clusters loaded on undoped graphene tested under the same *** labeling experiments confirmed the ammonia was a direct reaction product of N2 feeding gas instead of other chemical ***-situ X-ray photoelectron spectroscopy and X-ray absorption near-edge spectroscopy of post-reaction catalysts reveal that the sulfur dopant plays a critical role in stabilizing the chemical state and coordination environment of Au atoms in *** ReaxFF molecular dynamics(RMD)simulation confirmed the strong interaction between Au nanoclusters(NCs)and *** substrate-anchoring process could serve as an effective strategy to study ultrafine nanoclusters’electrocatalytic behavior while minimizing the destruction of the under-coordinated surface motif under harsh electrochemical reaction conditions.

关键词： gold nanoclusters sulfur-doped graphene nitrogen reduction reaction electrocatalysis anchoring effect

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Enhanced Oxidation Resistance of Iron Nanoparticles via Surface Modification in Chemical Vapor Condensation Process

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Journal of Materials Science & Technology 2010年第4期26卷 367-370页

作者： Dong-Won Lee Ji-Hun yu Taesuk Jang Byoung-Kee Kim Korea Institute of Materials Science Changwon 641-831 Korea Department of Electronic Materials Sunmoon University Asan 336-708 Korea 不详

In order to prevent the oxide formation on the surface of nano-size iron particles and thereby to improve the oxidation resistance in ordinary condition, iron nanoparticles synthesized by a chemical vapor condensation method were directly soaked in hexadecanethiol solution to coat them with a polymer layer. Oxygen content in the polymer-coated iron nanoparticles was significantly lower than that in usual air-passivated particles possessing iron-core/oxide-shell structure. Accordingly, oxidation resistance of the polymer-coated particles at an elevated temperature below 130℃ in air was 10-40 times higher than that of the normally passivated particles.

关键词： Powder technology Nano materials Iron Chemical vapor condensation

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