掺杂二氧化钛/碳的制备及可见光催化制氢

全文下载： 202404007.pdf

文章编号： 1672-6987（2024）04-0049-07； DOI： 10.16351/j.1672-6987.2024.04.007

孙媛媛， 宋彩霞*(青岛科技大学 材料科学与工程学院，山东 青岛 266042)

摘要： 采用深度低共熔溶剂为前驱体，通过一步热解法制备N,O掺杂多孔碳纳米片原位复合N,C掺杂TiO2异相结光催化剂。所得多孔异相结提供了更高的比表面积和更多活性位点。高温形成的锐钛矿相和金红石相TiO2，构成异相结，有利于光生电子和空穴的分离，抑制光生载流子重组。此外，TiO2与碳纳米片复合，光生电子转移到碳纳米片表面，进一步分离光生电子和空穴。元素掺杂两相TiO2，使禁带宽度变窄，拓宽了对可见光的吸收利用，提高了光催化还原水析氢活性。在可见光析氢测试中，产氢速率达到287 mmol·（g·h）-1，是单独使用锐钛矿TiO2的293倍。

关键词： 二氧化钛/碳； 异相结； 光催化； 析氢； 掺杂

中图分类号： O 614文献标志码： A

引用格式： 孙媛媛， 宋彩霞. 掺杂二氧化钛/碳的制备及可见光催化制氢［J］. 青岛科技大学学报(自然科学版), 2024, 45（4）： 49-55.

SUN Yuanyuan， SONG Caixia. Preparation of doped TiO2/carbon and visible-light catalytic hydrogen production［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2024， 45（4）： 49-55.

Preparation of Doped TiO2 /Carbon and Visible-Light Catalytic Hydrogen Production

SUN Yuanyuan， SONG Caixia

(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: In situ composite of N, O-doped porous carbon nanosheets with N, C-doped TiO2 heterojunction photocatalyst were prepared by one-step pyrolysis using a deep eutectic solvent as precursors. The resulting porous heterojunction provides higher specific surface area and more active sites. The anatase and rutile TiO2 formed at high temperature form phase junction, which is beneficial to the separation of photogenerated electrons and holes, and inhibits the recombination of photogenerated carriers. Element-doped two-phase TiO2 narrows the forbidden band width, broadens the absorption and utilization of visible light, and improves the photocatalytic reduction of water for hydrogen evolution. In addition, TiO2 composites with carbon nanosheets, and photogenerated electrons are transferred to the surface of carbon nanosheets, which further promotes the separation of photogenerated electrons and holes. The photocatalytic hydrogen production rate reached 287 mmol·（g·h）-1,under visible light, which is 293 times that of anatase TiO2 alone.

Key words: TiO2/C; phase junction; photocatalytic; hydrogen evolution; doping

收稿日期： 2023-05-28

基金项目： 国家自然科学基金项目 (51872152).

作者简介： 孙媛媛 (1997—), 女, 硕士研究生.*通信联系人.