在可见光照射下，利用内电场实现 B4C/C3N4 光催化 CO2 还原。
Photocatalytic CO2 reduction over B4C/C3N4 with internal electric field under visible light irradiation.
机构信息
Department of Chemical Engineering and Catalysis for Renewable Fuels (CReF) Center, University of South Carolina, Columbia, SC 29208, United States; Department of Metallurgical and Chemical Engineering, Jiyuan Vocational and Technical College, Jiyuan 459000, PR China.
Department of Chemical Engineering and Catalysis for Renewable Fuels (CReF) Center, University of South Carolina, Columbia, SC 29208, United States.
出版信息
J Colloid Interface Sci. 2016 Feb 15;464:89-95. doi: 10.1016/j.jcis.2015.11.022. Epub 2015 Nov 12.
Boron carbide/graphitic carbon nitride (B4C/g-C3N4) p-n hetero-junction photocatalyst with an internal electric field was synthesized by a facile solvent evaporation method and characterized by field emission scanning electron microscope (FESEM), UV-Vis diffuse reflectance spectra (UV-Vis DRS), photoluminescence spectra (PL), etc. Photocatalytic activity of the composite B4C/g-C3N4 loaded with Pt co-catalyst was evaluated using CO2 conversion to CH4 with H2 as the hydrogen source and reductant under visible light irradiation. The coupling of p-type B4C with n-type g-C3N4 significantly improved the performance of photocatalytic CO2 reduction; with the optimum B4C mass fraction of 1/6, the composite photocatalyst showed approximately 6 and 8 times higher CH4 generation rate than g-C3N4 and B4C, respectively. The enhancement was attributed to efficient photo-excited electron/hole separation due to the formation of internal electric field at the p-B4C/n-C3N4 interface.
采用简便的溶剂挥发法合成了具有内电场的碳化硼/石墨相氮化碳（B4C/g-C3N4）p-n 异质结光催化剂，并通过场发射扫描电子显微镜（FESEM）、紫外-可见漫反射光谱（UV-Vis DRS）、光致发光光谱（PL）等进行了表征。采用 CO2 与 H2 作为氢气源和还原剂，在可见光照射下，负载 Pt 共催化剂的复合 B4C/g-C3N4 的光催化活性通过 CO2 转化为 CH4 进行评估。p 型 B4C 与 n 型 g-C3N4 的耦合显著提高了光催化 CO2 还原的性能；在最佳 B4C 质量分数为 1/6 时，复合光催化剂的 CH4 生成速率分别比 g-C3N4 和 B4C 高约 6 倍和 8 倍。增强归因于 p-B4C/n-C3N4 界面形成内电场，从而实现了有效的光生电子/空穴分离。
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