Precisely Engineering Architectures of Co/C Sub‐Microreactors for Selective Syngas Conversion

Abstract

Fischer‐Tropsch synthesis (FTS) is an effective route to produce olefins, gasoline, diesel, and oxygenates from syngas (CO + H2). However, it still remains a challenge for regulating the product distribution of FTS. Here, a series of Co/C sub‐microreactors with precise designed nanoarchitectures are synthesized for selective syngas conversion. Through a combination of surface protection‐assisted etching and following carbonization process, Co/C sub‐microreactors with solid cube, double‐shelled hollow box, and hollow box architectures, namely, Co/C‐Cube, Co/C‐DBox, Co/C‐Box can be obtained. In FTS, comparing with solid Co/C‐Cube, double‐shelled hollow structured Co/C‐DBox is inclined to grow long‐chain hydrocarbon products, whereas hollow structured Co/C‐Box avails the formation of short‐chain hydrocarbon chemicals. Therefore, shape selective catalysis and controlled product distribution of FTS are realized by tuning the architectures of Co/C sub‐microreactors. It is expected to fundamentally unravel the heterogeneous catalytic process via upfront designing and precisely regulating the architectures of micro/nanoreactors.

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

“…In addition, the formed Co nanoparticles display the typical hollow structure due to the nanoscale Kirkendall effect, providing more dipole/interfacial polarization and multiple reflection/scattering that are good for enhanced EMW absorption capacity. The high-resolution TEM (HR-TEM) image (Figure b) of a single nanoscale Co metal nanoparticle displays an obvious lattice fringe spacing of 0.2 nm, which is corresponded to the (111) crystal plane of metallic Co . Moreover, the uniformly distributed C, Co, and N elements in the energy-dispersive spectroscopy (EDS) elemental mappings (Figure c–f) indicate the good homogeneity of the prepared HCF@NC/Co.…”

Precision solid synthesis of CoFe@FeOx nanoparticles for regulating Li/Na–S batteries

“…The CV curves of the CoFe@FeOx based RT Na-S battery with the scanning rate of 0.2 mV/s (vs Na/Na + ) are exhibited in Figure S26, which present typical oxidation peak (1.88 V) and reduction peak (1.16 V). 22 The comparison of charge density differences is presented in Figure 5B and 5C, which further demonstrates the strong interaction between Na2S4 and FeOx. The optimized adsorption configuration between Na2S4 and FeOx or graphite were displayed in Figure S27 and S28.…”

Self-assembly magnetized 3D hierarchical graphite carbon-based heterogeneous yolk–shell nanoboxes with enhanced microwave absorption

“…41 Therefore, carbonized PBAs are considered to be the ideal core in structural design as the alloy catalysis is conducive to promoting the graphitization process and improving the regional conductivity of carbon components, thereby facilitating the adjustment and improvement of MA performance. 42 Herein, we have innovatively constructed a yolk-shell structure with a core composed of magnetic components doped with 3D hierarchical GC and an amorphous carbon shell. More pertinently, GC is transformed from thin layers covering FeCo alloys into a 3D hierarchical cubic structure via self-assembly during the etching process of SiO 2 , under high temperature and pressure.…”

“…41 Therefore, carbonized PBAs are considered to be the ideal core in structural design as the alloy catalysis is conducive to promoting the graphitization process and improving the regional conductivity of carbon components, thereby facilitating the adjustment and improvement of MA performance. 42…”