Abstract
AbstractThe search for hydrogen storage materials allowing the storage of hydrogen in its molecular or atomic form at room temperature to meet the multistage targets such as the US Department of Energy (DOE) ultimate gravimetric and volumetric capacities of 6.5 wt% and 50 kg m‐3 is of global importance. Here, it is reported that an amorphized defective fullerene (C60‐x) offers a promising solution to this challenge. C60‐x immobilized with single‐atom platinum has ≈14‐fold higher surface area accessible for CH bonds compared to a crystalline C60, and its micro/meso pores give a ≈20‐fold larger volume for fast hydrogen transport. Indeed, hydrogen storage via spillover on C60‐x through pressure swing at room temperature is experimentally demonstrated to enable high reversible gravimetric (6.8 wt%) and volumetric (64.9 kg m‐3) capacities, hitherto the highest reversible capacities close to DOE targets at room temperature. Also, the density functional theory calculations show that a key to efficient hydrogen storage is the preservation of a curved sp2‐type local carbon geometry for spillover, which holds H radicals loosely for fast hydrogen migration. Moreover, H‐atom diffusion on the intact region of C60‐x is faster than that on the defect region. Furthermore, excellent capacity retention is achieved over repeated hydrogen adsorption/desorption cycles.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.