碳化物/半导体异质结催化设计及高效光催化分解水制氢研究

Using solar energy to achieve hydrogen (H2) from photocatalytic water splitting is one of the most promising strategies to solve the current facing energy crises and environmental pollution. This project mainly focuses on studying and developing novel high-efficiency, high-stability, and visible-light driven functional materials for photocatalytic H2-production. We focus on designing carbide/semiconductor heterojunctions and studying their high efficiency photocatalytic H2-production performance from water splitting. The research work mainly includes: (1) designing carbide/semiconductor heterojunction photocatalysts, expanding their light absorption, and improving light utilization efficiency. (2)Employing the relative characterization to reveal the charge generation and transfer mechanism in photocatalytic process. (3) Controlling the photoelectrochemical interface properties of carbide/semiconductor heterojunction, optimizing the process of charge transfer and micro-dynamic theory for photocatalytic water splitting, and improving the efficiency of photocatalytic H2-production. The development of related research of this project has significance theoretical and practical meanings for solar-light driven photocatalystic H2-production from water splitting.

利用太阳能光催化分解水制氢是解决当今能源紧张和环境污染的最佳手段之一。本项研究旨在设计和制备具有高活性、高稳定性、可见光响应的光催化产氢催化剂。我们聚焦于碳化物/半导体异质结催化的设计及高效光催化分解水制氢研究。研究工作主要包括：（1）设计碳化物/半导体异质结催化剂、拓展光吸收、提高光的利用效率；（2）采用相关表征手段来揭示光催化过程中载流子产生、转移的机理；（3）调控碳化物/半导体异质结的界面光电化学性质，优化电荷传输与光催化分解水的微观动力学过程，提高光催化产氢效率。本项目相关研究的开展，对于利用太阳能光催化分解水制氢具有重要的理论与实践意义。

本项目对碳化物/半导体异质结的构筑及其高效光解水制氢进行了深入系统的研究。利用新型纳米合成技术，成功制备出一系列高活性、高稳定性、可见光响应的光解水制氢催化剂，其中包括一维SrTiO3@Mo2C、TiO2@Mo2C/C、g-C3N4/Mo2C等高性能异质结光催化剂。拓展了光吸收、提高了光的利用效率；揭示出光催化过程中载流子产生、转移的机理，并对光解水制氢作用本质获得了系统性的理解和认识；通过调控碳化物/半导体异质结的界面光电化学性质，优化了电荷传输与光催化分解水的微观动力学过程，提高了光催化制氢效率。为绿色能源-氢能的高效开发利用提供了理论和技术上的支持。