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- Title
Pt|Cu Bimetallic Stratiform Nanocrystal Cluster Hierarchical Frameworks: Robust Catalyst for Hydrolyzing Ammonia Borane to Generate Hydrogen.
- Authors
Zhu, Yiming; Mao, Binglong; Zhang, Jun; Liu, Quanxing; Li, Xiang; Song, Kexing
- Abstract
A modified Galvani substitution protocol is proposed to fabricate serial Pt|Cu nanocrystals for hydrolyzing ammonia borane to generate H2 gas. The as‐fabricated Pt|Cu spheroidal nanocrystals with mean size of 75 nm hold porously hierarchical waxberry‐shaped appearance, with more subtle Pt grain cladding on Cu nanospheres to build the nanocrystal cluster frameworks. The lower Pt/Cu molar ratios result in the formation of a razor‐thin sublayer of Pt‐Cu alloy at the bimetallic interface; for the higher Pt/Cu molar ratios, no alloy phase forms, also without formation of probable oxides. The synergic effect contributes to the electron enrichment around Pt, helping to furnish more active sites. The catalytic ability increases with rising of Pt/Cu molar ratios; the Pt|Cu‐0.75 unfolds the abnormality even overtopping Pt NPs, with a turnover frequency value of 78.36 mol (H2)·min–1·(mol Pt)–1 and apparent activation energy of 32.89 kJ·mol–1. The catalytic hydrolytic reaction at the lower temperatures (298, 303 K) is identified as a first‐order reaction, while it belongs to second‐order reaction under the higher temperatures (308, 313, 318 K). The Pt|Cu‐0.75 nanocrystals express satisfactory stability with only 14% loss of the catalytic activity after 5‐time services, and excellent catalytic selectivity with no deleterious gas detected.
- Subjects
BORANES; HIERARCHICAL clustering (Cluster analysis); AMMONIA; HYDROGEN; ACTIVATION energy
- Publication
Advanced Materials Interfaces, 2022, Vol 9, Issue 14, p1
- ISSN
2196-7350
- Publication type
Article
- DOI
10.1002/admi.202102478