Hierarchically porous CoP@CNR nanorod derived from metal-organic frameworks as noble-metal-free catalyst for dehydrogenization of ammonia-borane. (27th January 2021)

• Record Type: Journal Article
• Authors: Jiang, Rui; Wang, Weizhe; Zheng, Xue; Li, Qian; Xu, Zhimou; Peng, Jing
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 7(2021)
• Page Start: 5345
• Page End: 5354
• Publication Date: 2021-01-27
• Subjects: MOFs -- Hierarchically porous structure -- CoP -- Ammonia-borane -- Hydrogen production; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.11.086
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The development of effective and inexpensive catalysts for hydrogen release from hydrogen-storage compounds such as ammonia-borane (AB) is crucial in academic and industrial fields for the reduction of greenhouse gas emissions. Herein, we report a facile method to fabricate well-dispersed CoP nanoparticles (NPs) with an average particle size of 4.3 nm. The CoP NPs were encapsulated in carbonaceous nanorods (CoP@CNR) using metal-organic frameworks (MOFs) as a sacrificial precursor. The CoP@CNR catalysts were characterized, and their catalytic performance for the dehydrogenization of AB at 25 °C in an alkaline solution was determined. CoP@CNR (400) with a hierarchically meso-microporous structure (micropore area = 73.6 m 2 g -1 and micropore volume = 0.19 cm 3 g -1 ) and a specific surface area of 88.4 m 2 g -1 was synthesized during the phosphorization process. The hierarchically porous structure was instrumental in immobilizing metal NPs and accelerating mass diffusion. Moreover, the incorporation of P into Co NPs modified the electronic structure of the latter and accelerated the dehydrogenization of AB. This resulted in a hydrogen release rate of 10, 014 mL/(min·g), which was 13 times higher than that of the pure Co nanocatalyst. In addition, we reported the kinetic studies for AB hydrolysis catalyzed by CoP@CNR (400) in terms of the temperature effect, isotope effect, catalyst concentration, AB concentration, and NaOH concentration. Graphical abstract: Image 1 Highlights: The CoP@CNR is derived from Co-MOF-74. The CoP@CNR shows hierarchically meso-microporous structure. The CoP@CNR is reusable and highly active for dehydrogenization of ammonia-borane.