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Small. 2019 Mar;15(10):e1805460. doi: 10.1002/smll.201805460. Epub 2019 Feb 4.

A Simple and Scalable Route to Synthesize Cox Cu1- x Co2 O4 @Coy Cu1- y Co2 O4 Yolk-Shell Microspheres, A High-Performance Catalyst to Hydrolyze Ammonia Borane for Hydrogen Production.

Lu D1,2, Li J1,2, Lin C1, Liao J2, Feng Y2, Ding Z2, Li Z3, Liu Q1, Li H2.

Author information

1
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China.
2
School of Chemistry and Materials Engineering, Huizhou University, Huizhou, 516007, China.
3
Department of Chemistry, University of California, Riverside, CA, 92521, USA.

Abstract

Yolk-shell structured micro/nano-sized materials have broad and important applications in different areas due to their unique spatial configurations. In this study, yolk-shell structured Co3 O4 @Co3 O4 is prepared using a simple and scalable hydrothermal reaction, followed by a calcination process. Then, Cox Cu1- x Co2 O4 @Coy Cu1- y Co2 O4 microspheres are synthesized via adsorption and calcination processes using the as-prepared Co3 O4 @Co3 O4 as the precursor. A possible formation mechanism of the yolk-shell structures is proposed based on the characterization results, which is different from those of yolk-shell structures in previous study. For the first time, the catalytic activity of yolk-shell structured catalysts in ammonia borane (AB) hydrolysis is studied. It is discovered that the yolk-shell structured Cox Cu1- x Co2 O4 @Coy Cu1- y Co2 O4 microspheres exhibit high performance with a turnover frequency (TOF) of 81.8 molhydrogen min-1 molcat -1 . This is one of the highest TOF values reported for a noble-metal-free catalyst in the literature. Additionally, the yolk-shell structured Cox Cu1- x Co2 O4 @Coy Cu1- y Co2 O4 microspheres are highly stable and reusable. These yolk-shell structured Cox Cu1- x Co2 O4 @Coy Cu1- y Co2 O4 microsphere is a promising catalyst candidate in AB hydrolysis considering the excellent catalytic behavior and low cost.

KEYWORDS:

ammonia borane; heterogeneous catalysis; hydrogen production; scalable route; yolk-shell structure

PMID:
30714320
DOI:
10.1002/smll.201805460

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