Direct preparation of hierarchical macroporous β-SiC using SiO₂ opal as both template and precursor and its application in water splitting

Bin ZhaoJiangsu Provincial Key Laboratory of Photonic and Electronic Materials Sciences and Technology, School of Electronic Science and Engineering, Nanjing University, Nanjing210093, China

Xiaoning GuoState Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan030001, China

Mingbo ZhengJiangsu Provincial Key Laboratory of Photonic and Electronic Materials Sciences and Technology, School of Electronic Science and Engineering, Nanjing University, Nanjing210093, China;College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou225002, ChinaCorrespondence[email protected]

Zixia LinJiangsu Provincial Key Laboratory of Photonic and Electronic Materials Sciences and Technology, School of Electronic Science and Engineering, Nanjing University, Nanjing210093, China

Xiangyun GuoState Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan030001, China

Huan PangCollege of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou225002, China

Yi ShiJiangsu Provincial Key Laboratory of Photonic and Electronic Materials Sciences and Technology, School of Electronic Science and Engineering, Nanjing University, Nanjing210093, ChinaCorrespondence[email protected]

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Abstract

β-SiC is a suitable photocatalyst for hydrogen evolution reaction because of its proper band structure (2.36 eV) and high chemical stability. Porous β-SiC has a large surface area that can increase the number of reactive sites and shorten the charge transport pathways between the material interior and surface, thereby significantly improving the hydrogen evolution reaction performance. In the present study, hierarchical macroporous β-SiC monolith composed of nanocrystals was directly prepared using SiO₂ opal as both template and precursor via the magnesiothermic reduction method at 750 °C. An interfacial magnesiothermic reaction model was presented as well. The β-SiC sample exhibited high photoelectric conversion performance and stability as a catalyst for hydrogen evolution.

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Direct preparation of hierarchical macroporous β-SiC using SiO₂ opal as both template and precursor and its application in water splitting

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Direct preparation of hierarchical macroporous β-SiC using SiO₂ opal as both template and precursor and its application in water splitting