PtNi/NiO Clusters Coated by Hollow Sillica: Novel Design for Highly Efficient Hydrogen Production from Ammonia–Borane

详细信息    查看全文

• 作者：Yuzhen GeWanyue Ye ; Zameer Hussain Shah ; Xijie LinRongwen Lu ; Shufen Zhang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 1, 2017
• 年：2017
• 卷：9
• 期：4
• 页码：3749-3756
• 全文大小：651K
• ISSN：1944-8252

文摘

Ammonia–borane (NH₃·BH₃; AB) has been considered as an excellent chemical material for hydrogen storage. However, developing highly efficient catalysts for continuous hydrogen generation from AB is still a challenge for future fuel cell applications. The combination of Pt with Ni is an effective strategy to achieve active bimetallic nanocatalyst, and the particle size has proved to play a crucial role in determining its final activity. However, the synthesis of PtNi bimetallic catalyst in the size of highly dispersed clusters has always been a challenge. In this report, PtNi/NiO clusters coated by small-sized hollow silica (R–PtNi/NiO@SiO₂) were designed for efficient hydrogen generation from the hydrolysis of ammonia–borane. The newly designed catalysis system showed extremely high activity with the initial turnover frequency value reaching 1240.3 mol of H₂·mol^–1 of Pt·min^–1, which makes it one the most active Pt-based catalysts for this reaction. Detailed characterization by means of scanning transmission electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy element mapping, etc. revealed that the excellent performance of R–PtNi/NiO@SiO₂ is derived from the highly dispersed PtNi/NiO clusters and the reduction of extra Pt⁴⁺ on the surface of PtNi/NiO clusters to Pt⁰ at relatively low temperature.