Interfacial ensemble effect of copper nanoparticles and nickel metal-organic framework on promoting hydrogen generation. (30th June 2022)

• Record Type: Journal Article
• Authors: Xu, Wenjing; Liu, Mei; Wang, Sufang; Peng, Zhikun; Shen, Ruofan; Li, Baojun
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 55(2022)
• Page Start: 23213
• Page End: 23220
• Publication Date: 2022-06-30
• Subjects: Metal-organic framework -- Interface -- Metal -- Ammonia borane -- Dual active sites; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.05.108
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Ammonia borane is a promising chemical hydrogen storage material to the hydrogen economy in the future. However, efficient and inexpensive catalyst for realizing this process remains challenging. Herein, the interfaces of copper nanoparticles (NPs) and nickel metal-organic framework (MOF) with different Cu/Ni ratios (Cu@Nix -MOF) have been constructed by Cu NPs in situ growth in Ni-MOF via a facile one-step solvothermal method. The Cu@Nix -MOF composites show much higher catalytic activity than their monometal counterparts and the optimized Cu@Ni6 -MOF catalyst achieves a turnover frequency of 69.1 min −1 for ammonia borane hydrolysis, superior to most reported Ni-based catalysts. Density functional theory simulation and in situ Raman spectroscopy analysis propose that this remarkable enhanced activity of Ni-based catalysts is induced by a synergetic effect of Cu–Ni 2+ dual active sites at their interfaces. This study shows that the strategy of dual active sites hold great promise to achieve efficient non-noble metal catalysts toward heterogeneous catalysis. Graphical abstract: Cu nanoparticles are encapsulated in Ni-metal organic framework by one step and the interfaces of Cu–Ni 2+ are constructed, which show remarkable catalytic activity in NH3 BH3 hydrolysis. Fourier transform infrared analyses for the first time experimentally demonstrate the adsorption site at the boron element. In situ Raman spectroscopy analyses validate a synergy of Cu–Ni 2+ dual active sites. Image 1 Highlights: Cu nanoparticles are encapsulated in Ni-metal organic framework by one step. The synergistic catalysis of Cu nanoparticles and Ni-MOF is in a synchronized manner. The interface shows remarkable catalytic activity during the NH3 BH3 hydrolysis. The mechanism of dual active sites of Cu NPs-Ni MOF is proposed.