Fabrication and characterization of mesoporous Si/SiC derived from diatomite via magnesiothermic reduction

Zheng, Youjin; Fang, Hongliang; Wang, Fangbiao; Huang, Hailiang; Yang, Juan; Zuo, Guihong

doi:10.1016/j.jssc.2019.07.026

Cited by 13 publications

(7 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[ 33,36–41 ] On the other hand, the Si of diatomite can be doped into the carbon substrate and act as the silicon source of SiC. [ 42,43 ] Inspired by this, we hypothesize that Si atom of diatomite could be incorporated into the carbon basal plane of SACs by replacing the N atoms of CoN 4 moieties. Taking these factors into account, it is envisaged that systematically exploring diatomite‐based precursors would potentially not only tailor the geometry and electronic structures of CoN 4 moieties, but also overcome problems of underutilization of isolated Co single atoms on SACs.…”

Section: Introductionmentioning

confidence: 99%

Mineral Modulated Single Atom Catalyst for Effective Water Treatment

Dong

Chen

Tang

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Single atom catalysts (SACs) have been growing as an emerging "hot" topic in environmental remediation. Their performance can be rationally optimized via modulating spatial coordination configuration and the porous structure of SACs, which is still challenging. Herein, a novel Si, N co-coordinated cobalt SAC (p-CoSi 1 N 3 @D) with 3D free standing architecture is tailored via employing natural mineral (diatomite) as a Si source and porous template. Theoretical calculations and experimental analysis reveal that the substitution of N by Si dramatically accelerates the interaction and electron transfer between peroxymonosulfate and the Co single atom center. Moreover, p-CoSi 1 N 3 @D inherits the hierarchically porous architecture of diatomite, providing more accessible cobalt sites and open diffusion channels for peroxymonosulfate and contaminants in water treatment applications. Thanks to optimal coordination structure and porous architecture, p-CoSi 1 N 3 @D can serve as a highly active catalyst for peroxymonosulfate activation, with a turnover frequency of 299.8 min −1 for bisphenol A degradation, surpassing those of catalysts with transition metal SACs or oxides in the disclosed literature. This work provides a novel strategy for the development of SACs for wastewater reclamation, and deepens the understanding of the significant role of templates in spatial coordination configuration of SACs.

show abstract

Section: Introductionmentioning

confidence: 99%

Mineral Modulated Single Atom Catalyst for Effective Water Treatment

Dong

Chen

Tang

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…Chemie substrate showed good crystallinity with characteristic peaks of 35.7°, 41.4°, 60.1°, and 71.9°, which were assigned to the corresponding (111), ( 200), (220), and (311) crystal planes, respectively. [34,35] Interestingly, the XRD pattern of Pt 1 /SiC-160 were similar to pure SiC substrate, indicating the absence of any crystal materials. A possible reason for this phenomenon was that the low metal content and small size made Pt 1 / SiC-160 not detectable by XRD measurements.…”

Section: Methodsmentioning

confidence: 94%

Probing Coordination Number of Single‐Atom Catalysts by d‐Band Center‐Regulated Luminescence

Guan,

Cheng,

Pei

et al. 2024

Angew Chem Int Ed

View full text Add to dashboard Cite

It is essential to probe the coordination number (CN) because it is a crucial factor to ensure the catalytic capability of single‐atom catalysts (SACs). Currently, synchrotron X‐ray absorption spectroscopy (XAS) is widely used to measure the CN. However, the scarcity of synchrotron X‐ray source and complicated data analysis restrict its wide applications in determining the CN of SACs. In this contribution, we have developed a d‐band center‐regulated acetone cataluminescence (CTL) probe for a rapid screening of the CN of Pt‐SACs. It is disclosed that the CN‐triggered CTL is attributed to the fact that the increased CN could induce the downward shift of d‐band center position, which assists the acetone adsorption and promotes the subsequent catalytic reaction. In addition, the universality of the proposed acetone‐CTL probe is verified by determining the CN of Fe‐SACs. This work has opened a new avenue for exploring an alternative to synchrotron XAS for the determination of CN of SACs and even conventional metal catalysts through d‐band center‐regulated CTL.

show abstract

“…The main composition of diatomite is SiO 2 , which is obtained from the accumulation and deposition of unicellular aquatic plankton. Although diatomite was reduced to get Si-based materials, − the electrochemical performances of obtained Si are still poor as shown in Table S1. Furthermore, high-temperature magnesiothermic reduction is usually chosen as the synthesis strategy .…”

Section: Introductionmentioning

confidence: 99%

Reconstructed Nano-Si Assembled Microsphere via Molten Salt-Assisted Low-Temperature Aluminothermic Reduction of Diatomite as High-Performance Anodes for Lithium-Ion Batteries

Wang

Zhang

Dong

et al. 2021

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Silicon (Si), as a promising candidate anode material of lithium-ion batteries (LIBs), is going to have large-scale applications. Its high theoretical specific capacity, low lithiation potential, and natural abundance can meet the consumer expectation for the high energy density and cycle life of LIBs. At present, the huge volume change and very high manufacturing costs also hinder its wide applications. Therefore, preparation of Si material using abundant siliceous rocks in earth and reasonable structure design are important strategies to solve the problems. Here, we report a new nano/microstructure of Si microsphere assembled by nano-Si via molten salt-assisted lowtemperature aluminothermic reduction of diatomite. The use of abundant diatomite can reduce the synthetic cost of Si. Moreover, the molten salt-assisted low-temperature aluminothermic reduction can significantly lower the synthesis temperature and energy consumption to further reduce the cost. More importantly, the new nano/ microstructure of Si microsphere can disperse expansion stress in local nanocrystalline area compared to the bulk perfect crystalline Si. As the anode of LIBs, the electrode exhibits good cycle stability and can deliver a reversible capacity of 1330.1 mAh g −1 after 200 cycles at 0.2 A g −1 . This work offers a cheap synthesis route to prepare new nano/microstructure and is significant for large-scale applications of Si materials.

show abstract

Fabrication and characterization of mesoporous Si/SiC derived from diatomite via magnesiothermic reduction

Cited by 13 publications

References 20 publications

Mineral Modulated Single Atom Catalyst for Effective Water Treatment

Mineral Modulated Single Atom Catalyst for Effective Water Treatment

Probing Coordination Number of Single‐Atom Catalysts by d‐Band Center‐Regulated Luminescence

Reconstructed Nano-Si Assembled Microsphere via Molten Salt-Assisted Low-Temperature Aluminothermic Reduction of Diatomite as High-Performance Anodes for Lithium-Ion Batteries

Contact Info

Product

Resources

About