期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 136, 期 35, 页码 12422-12430出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja506712d
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资金
- Marie Curie Co-fund (Empa Postdoc Programme)
- European Union (ERC) [GA 306733, IIF-GA-2012-330524]
- CTI Swiss Competence Centers for Energy Research (SCCER Heat and Electricity Storage)
- Swiss SNF [200021_140245]
- Swiss National Science Foundation (SNF) [200021_140245] Funding Source: Swiss National Science Foundation (SNF)
We report a facile colloidal synthesis of gallium (Ga) nanopartides with the mean size tunable in the range of 12-46 nm and with excellent size distribution as small as 7-8%. When stored under ambient conditions, Ga nanoparticles remain stable for months due to the formation of native and passivating Ga-oxide layer (2-3 nm). The mechanism of Ga nanoparticles formation is elucidated using nuclear magnetic resonance spectroscopy and with molecular dynamics simulations. Size-dependent crystallization and melting of Ga nanoparticles in the temperature range of 98-298 K are studied with X-ray powder diffraction, specific heat measurements, transmission electron microscopy, and X-ray absorption spectroscopy. The results point to delta (delta)-Ga polymorph as a single low-temperature phase, while phase transition is characterized by the large hysteresis and by the large undercooling of crystallization and melting points down to 140-145 and 240-250 K, respectively. We have observed size-tunable plasmon resonance in the ultraviolet and visible spectral regions. We also report stable operation of Ga nanoparticles as anode material for Li-ion batteries with storage capacities of 600 mAh g(-1), 50% higher than those achieved for bulk Ga under identical testing conditions.
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