Abstract In this work, we report a comprehensive investigation on the catalytic performance and mechanism of mayenite electride [Ca24Al28O64]4+(O2−)2−x (e−)2x (C12A7:e−) as an electron donor type promoter to P25 in hydrogen production from water. Herein, the C12A7:e−–P25 composites were prepared by simply mechanical mixing method. The optimum H2 evolution rate reached 663 μmol h−1 g−1 which was 43.9 times higher than that of pure P25, when 0.25 wt% C12A7:e− was added. Mott–Schottky plots and X-ray photoelectron spectroscopic results confirmed the injection of electrons encaged in C12A7:e− to the conduction band of P25. Surface photovoltage measurements and photoluminescence results showed that the introduction of C12A7:e− promoted the efficient separation of photogenerated electron-hole pairs of P25, which illustrated the formation of built-in electric field from P25 to C12A7:e− due to the difference in work function. The present work provides new promoter choices for photocatalytic studies.

中文翻译：

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高导电性 C12A7:e- 电子纳米粒子作为 P25 的电子供体型促进剂，用于增强光催化析氢

摘要 在这项工作中，我们报告了对钙铝石电子化合物 [Ca24Al28O64]4+(O2−)2−x (e−)2x (C12A7:e−) 作为 P25 的电子供体型促进剂的催化性能和机理的综合研究。从水中制氢。在此，C12A7:e--P25 复合材料是通过简单的机械混合方法制备的。当添加 0.25 wt% C12A7:e- 时，最佳 H2 析出速率达到 663 μmol h-1 g-1，是纯 P25 的 43.9 倍。Mott-Schottky 图和 X 射线光电子能谱结果证实了 C12A7:e- 中的电子注入到 P25 的导带。表面光电压测量和光致发光结果表明，C12A7:e-的引入促进了P25光生电子-空穴对的有效分离，这说明了由于功函数的差异，从 P25 到 C12A7:e- 的内建电场的形成。目前的工作为光催化研究提供了新的促进剂选择。