Synthesis and Crystal-Phase Engineering of Mesoporous Palladium–Boron Alloy Nanoparticles
Synthesis and Crystal-Phase Engineering of Mesoporous Palladium–Boron Alloy Nanoparticles
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DOI:
10.1021/acscentsci.0c01262
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发表时间:
2020-11-13
影响因子:
18.2
通讯作者:
Liu B
中科院分区:
文献类型:
--
作者:
Lv H;Xu D;Kong C;Liang Z;Zheng H;Huang Z;Liu B
Rational design and synthesis of noble metal nanomaterials with desired crystal phases (atomic level) and controllable structures/morphologies (mesoscopic level) are paramount for modulating their physiochemical properties. However, it is challenging to simultaneously explore atomic crystal-phase structures and ordered mesoscopic morphologies. Here, we report a simple synergistic templating strategy for the preparation of palladium–boron (Pd–B) nanoparticles with precisely controllable crystal-phases and highly ordered mesostructures. The engineering of crystal-phase structures at atomic levels is achieved by interstitially inserting metallic B atoms into face-centered cubic mesoporous Pd (fcc-mesoPd) confined in a mesoporous silica template. With the gradual insertion of B atoms, fcc-mesoPd is transformed into fcc-mesoPd5B, hcp-mesoPd2B with randomly distributed B atoms (hcp-mesoPd2B-r), and hcp-mesoPd2B with an atomically ordered B sequence (hcp-mesoPd2B-o) while preserving well-defined mesostructures. This synergistic templating strategy can be extended to engineer crystal-phase structures with various mesostructures/morphologies, including nanoparticles, nanobundles, and nanorods. Moreover, we investigate the crystal-phase-dependent catalytic performance toward the reduction reaction of p-nitrophenol and find that hcp-mesoPd2B-o displays much better catalytic activity. This work thus paves a new way for the synthesis of hcp-Pd2B nanomaterials with mesoscopically ordered structure/morphology and offers new insights of fcc-to-hcp evolution mechanisms which could be applied on other noble metal-based nanomaterials for various targeted applications. A synergistic template method is reported to synthesize mesoporous Pd−B nanoparticles with atomically ordered hexagonal close-packed crystal-phase structure and mesoscopically ordered double gyriod Ia3̅d morphology.
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15
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通讯作者:
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