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Solution-based Synthesis of NiSb nanoparticles for Electrochemical Activity in Hydrogen Evolution Reaction
杨晴
Author NameAffiliationE-mail
杨晴 中国科学技术大学化学系 qyoung@ustc.edu.cn 
Abstract:
A cost-effective, facile solution-based hot-injection synthetic route has been developed to synthesize NiSb nanoparticles in oleylamine (OAm) using commercially available inexpensive precursors with reducing toxicity at a relatively low temperature of 160 °C. In especial, an organic reductant of borane-tert-butylamine complex is intentionally involved in the reaction system to promote a fast reduction of metallic Ni and Sb for the formation of the NiSb nanoparticles. Structural characterizations reveal that the NiSb nanoparticles are hexagonal phase with space group P63/mmc and they are composed of small granules with size about 10 nm that tend to form agglomerates with porous-like geometries. This is the first report on the generation of transition metal antimonide via solution-based strategy, and the as-fabricated nanoparticles possess actively electrocatalytic hydrogen evolution reaction (HER) property in acidic electrolytes when the long-chain ligand of OAm adhered on the surface of the nanoparticles are exchanged by ligand-removal and exchange procedure. It is found that the NiSb nanoparticles as a new kind of non-noble-metal HER electrocatalysts only require overpotentials of 437 and 531 mV to achieve high current densities of 10 and 50 mA cm-2, as well as exhibit low charge transfer resistance and excellent HER stability.
Key words:  hot-injection synthetic route, NiSb nanoparticles, ligand-removal and exchange, HER activity
FundProject:
Solution-based Synthesis of NiSb nanoparticles for Electrochemical Activity in Hydrogen Evolution Reaction
杨晴
摘要:
A cost-effective, facile solution-based hot-injection synthetic route has been developed to synthesize NiSb nanoparticles in oleylamine (OAm) using commercially available inexpensive precursors with reducing toxicity at a relatively low temperature of 160 °C. In especial, an organic reductant of borane-tert-butylamine complex is intentionally involved in the reaction system to promote a fast reduction of metallic Ni and Sb for the formation of the NiSb nanoparticles. Structural characterizations reveal that the NiSb nanoparticles are hexagonal phase with space group P63/mmc and they are composed of small granules with size about 10 nm that tend to form agglomerates with porous-like geometries. This is the first report on the generation of transition metal antimonide via solution-based strategy, and the as-fabricated nanoparticles possess actively electrocatalytic hydrogen evolution reaction (HER) property in acidic electrolytes when the long-chain ligand of OAm adhered on the surface of the nanoparticles are exchanged by ligand-removal and exchange procedure. It is found that the NiSb nanoparticles as a new kind of non-noble-metal HER electrocatalysts only require overpotentials of 437 and 531 mV to achieve high current densities of 10 and 50 mA cm-2, as well as exhibit low charge transfer resistance and excellent HER stability.
关键词:  hot-injection synthetic route, NiSb nanoparticles, ligand-removal and exchange, HER activity
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