高等学校化学学报

高等学校化学学报

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[李铁津教授纪念专辑]构建富含1T相的MoSe2/g-C3N4直接Z型异质结用于高选择性光催化CO2还原制甲醇

李笃敏,贾若琨,王芃芃,陈佳慧,李天祥,宋续博   

  1. 东北电力大学化学工程学院
  • 收稿日期:2026-04-22 修回日期:2026-07-09 网络首发:2026-07-17 发布日期:2026-07-17
  • 通讯作者: 贾若琨 E-mail:20102175@neepu.edu.cn
  • 基金资助:
    吉林省教育厅科学技术研究项目（批准号：JJKH20250889CY）资助

[李铁津教授纪念专辑]Construction of 1T phase-rich MoSe2/g-C3N4 direct Z-scheme heterojunction for highly selective photocatalytic CO2 reduction to methanol

LI Dumin, JIA Ruokun*, WANG Pengpeng, CHEN Jiahui, LI Tianxiang, SONG Xubo   

  1. College of Chemical Engineering, Northeast Electric University
  • Received:2026-04-22 Revised:2026-07-09 Online First:2026-07-17 Published:2026-07-17
  • Supported by:
    Supported by the Science and Technology Research Project of Department of Education, Jilin Province, China(No. JJKH20250889CY)

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摘要： 本研究旨在构建兼具强还原电子保留能力与高效电荷分离特性的复合光催化体系，实现二氧化碳向甲醇的高选择性转化。研究采用热聚合法制备石墨相氮化碳，并通过一步溶剂热法原位负载二硒化钼，构建不同负载量的复合材料；结合结构表征、光电性能测试与能带分析，系统探讨界面电荷转移机制与反应路径。结果表明，含70 wt%二硒化钼的复合材料表现出最佳性能，气态甲醇产率达到14.433 μmol g-1 h-1，选择性为69.3%，总产率达到76.248 mmol g-1 h-1，约为纯石墨相氮化碳的15倍。机理分析证实体系通过直接Z型异质结实现强还原电子在二硒化钼导带的保留，并促进多电子质子耦合反应过程。本研究为高选择性光催化二氧化碳还原制甲醇提供了界面工程与能带调控相结合的设计思路，对人工光合作用体系优化具有重要理论意义与应用价值。

关键词: 光催化, 二氧化碳还原, 硒化钼, 氮化碳

Abstract: This study aims to construct a composite photocatalytic system with both strong reductive electron retention capability and efficient charge separation properties for the highly selective conversion of carbon dioxide to methanol. Graphitic carbon nitride was prepared via thermal polymerization, and molybdenum diselenide was in-situ loaded through a one-step solvothermal method to fabricate composites with different loading ratios. Combined with structural characterization, photoelectric property measurements and energy band analyses, the interfacial charge transfer mechanism and reaction pathways were systematically investigated. The results showed that the composite with 70 wt% molybdenum diselenide exhibited the optimal performance, with a gaseous methanol yield of 14.433 μmol g-1 h-1 and a selectivity of 69.3%, and the total yield reached 76.248 mmol g-1 h-1, approximately 15 times higher than that of pure graphitic carbon nitride. Mechanistic analysis confirmed that the system retained strong reductive electrons in the conduction band of molybdenum diselenide via a direct Z-scheme heterojunction, and promoted the multi-electron proton-coupled reaction process. This work provides a design strategy combining interface engineering and energy band modulation for highly selective photocatalytic CO2 reduction to methanol, which is of great theoretical significance and application value for the optimization of artificial photosynthesis systems.

Key words: Photocatalysis, Carbon Dioxide Reduction, Molybdenum Selenide, Carbon Nitride

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