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journal article·2024-02

High‐Index Faceted Cu2O@CuO Mesocrystals Act as Efficient Catalyst for Si Hydrochlorination to Trichlorosilane

Yongjun Ji, Shaomian Liu, Shaojia Song, Liwen Xing, Ting Kang, Bin Zhang, Huifang Li, Wenxing Chen, Zhenxing Li, Ziyi Zhong, Guangwen Xu, Fabing Su

Small· Volume 20· Issue 6
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Source abstract

Abstract

Abstract Mesocrystals (MCs) with high‐index facets may have superior catalytic properties to those with low‐index facets and their nanocrystal counterparts. However, synthesizing such mesocrystal materials is still very challenging because of the metastability of MCs and energetic high‐index crystal facets. This work reports a successful solvothermal method followed by calcination for synthesizing copper oxide‐based MCs possessing a core–shell structure (denoted as Cu2O@CuO HIMCs). Furthermore, these MCs are predominantly bounded by the high‐index facets such as {311} or {312} with a high‐density of stepped atoms. When used as catalysts in Si hydrochlorination to produce trichlorosilane (TCS, the primary feedstock of high‐purity crystalline Si), Cu2O@CuO HIMCs exhibit significantly enhanced Si conversion and TCS selectivity compared to those with flat surfaces and their nanostructured counterparts. Theoretical calculations reveal that both the core–shell structure and the high‐index surface contribute to the increased electron density of Cu sites in Cu2O@CuO HIMCs, promoting the adsorption and dissociation of HCl and stabilizing the dissociated Cl* intermediate. This work provides a simple method for synthesizing high‐index faceted MCs and offers a feasible strategy to enhance the catalytic performance of MCs.
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Research context

NanomaterialsCatalysis & surfaces

OpenAlex topics: Catalytic Processes in Materials Science · Copper-based nanomaterials and applications · Magnesium Oxide Properties and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Light Industry Beijing Technology and Business University Beijing 100048 China

School of Chemistry and Chemical Engineering Hebei Normal University for Nationalities Chengde 067000 China

State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China

College of Chemistry and Materials Engineering Beijing Technology and Business University Beijing 100048 China

Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China

Analytical and Testing Center Chongqing University Chongqing 401331 China

Energy & Catalysis Center School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China

Department of Chemical Engineering Guangdong Technion‐Israel Institute of Technology (GTIIT) 241 Daxue Road Shantou 515063 China

Technion‐Israel Institute of Technology (IIT) Haifa 32000 Israel

Institute of Industrial Chemistry and Energy Technology Shenyang University of Chemical Technology Shenyang 110142 China

Funding

National Natural Science Foundation of China

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