Synergistic Pt-WO₃ Dual Active Sites to Boost Hydrogen Production from Ammonia Borane.

ABSTRACT: Development of synergistic heterogeneous catalysts with active sites working cooperatively has been a pursuit of chemists. Herein, we report for the first time the fabrication and manipulation of Pt-WO₃ dual-active-sites to boost hydrogen generation from ammonia borane. A combination of DFT calculations, structural characterization, and kinetic (isotopic) analysis reveals that Pt and WO₃ act as the active sites for ammonia borane and H₂O activation, respectively. A trade-off between the promoting effect of WO₃ and the negative effect of decreased Pt binding energy contributes to a volcano-shaped activity, and Pt/CNT-5W delivers a 4-fold increased activity of 710.1 mol_H2·mol_Pt^-1·min^-1. Moreover, WO₃ is suggested to simultaneously act as the sacrificial site that can divert B-containing by-products away from Pt sites against deactivation, yielding an increase from 24% to 68% of the initial activity after five cycles. The strategy demonstrated here could shed a new light on the design and manipulation of dual-active-site catalysts.

SUBMITTER: Chen W 

PROVIDER: S-EPMC7052519 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature