Developing high-rate
anode materials with large capacity for lithium ion batteries (LIBs)
is quite necessary for the booming electric vehicles industry. The
utilization of stable and conductive hollow structures for electrode
composite materials could make the desired performances possible in
the future. Thus, in this study, a hollow structured Ni–CoSe2 embedded in N-doped amorphous carbon nanocomposite (Ni–CoSe2@NC) has been successfully synthesized with metal–organic
frameworks (MOFs) as precursors. Such strategy integrates both the
merits of the multicomponents and the hollow structure; the latter
could facilitate both mass and charge transport, and the former (the
N-doped carbon) could not only offer plenty of surface defects, improving
the surface capacitive contributions, but also stabilize the electrode
structure during the charge/discharge processes. As a result, the
metal selenide composite delivers outstanding high-rate properties
with good stability as the anode for LIBs. The structure and components
design could also be extended to other anode composites in the future.
This report describes a facile strategy that has the capability of adjusting different surface hydrophilicities/hydrophobicities of catalysts by covering metal-organic frameworks with graphene oxide and reduced graphene oxide. The catalysts exhibit remarkable catalytic selective performance for the hydrogenation of different hydrophobic and hydrophilic reactants.
Constructing hierarchical pore structures in metal–organic frameworks (H‐MOFs) can significantly enhance their catalytic performance. However, common strategies for preparing H‐MOFs only focus on creating hierarchical pores to facilitate the molecular diffusion but neglect the synergistic effect of hierarchical pores with multiactive sites in H‐MOFs. Therefore, the development of a suitable strategy with hierarchical pores and multiactive sites in H‐MOFs serving as multifunctional and efficient catalysts is highly desired. In this work, a facile strategy is developed to prepare functional nanoparticles (NPs)/MOFs catalysts with a macro‐microporous structure (NPs/M‐MOFs) and multiactive sites (more NPs and base sites) through template etching and immersion reduction. The as‐prepared Pt/M‐zeolitic imidazolate framework‐8 (ZIF‐8) shows high performance in the Knoevenagel condensation−hydrogenation two‐steps catalytic reaction, mainly due to the existence of macropores in the ZIF‐8 and the exposure of the multiactive sites (more Pt NPs and base sites). This strategy is potentially extendable to other series of MOFs for structuring functional NPs/M‐MOFs catalysts that can optimize the performance of catalytic reaction.
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