TiO_2基纳米材料的制备及其光电催化性能的研究
详细信息 查看官网全文
- 英文论文题名：Study of the preparation and photoelectrochemical performance of TiO_2-based nanocomposite films
- 论文作者：张晓凡 ; 申燕
- 英文论文作者：Xiaofan Zhang ; Yan Shen ; Wuhan National Laboratory for Optoelectronics ; Huazhong University of Science and Technology
- 年：2016
- 作者机构：华中科技大学武汉光电国家实验室;
- 论文关键词：光电催化 ; 二氧化钛 ; 掺杂 ; 异质结 ; 钙钛矿能电池
- 英文论文关键词：photoelectrocatalysis ; titanium dioxide ; doping ; heterojunction ; perovskite solar cell
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十七分会：光化学
- 语种：中文
- 分类号：TQ134.11;TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十七分会 ; 光化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：114k
- 原文格式：D
- 会议级别：全国
摘要
能源危机和环境污染是当今社会发展面临的严峻挑战,氢能具有储量丰富、高能量密度等优势,被认为是理想绿色环保的可再生能源。采用光助电催化技术,以水为来源实现太阳能转化为氢能成为当下的研究热点,其中二氧化钛半导体在该领域具有带隙位置合适、稳定性高的优势而备受关注。但是二氧化钛带隙较宽,电子-空穴的分离效率低,到目前为止,二氧化钛的光电转换效率仍很低。所以,制备宽光谱吸收(尤其是可见光)和具有良好的载流子分离性能的TiO_2基复合材料成为有效利用太阳能的关键所在。针对以上问题,本课题组深入开展以下研究工作:i)还原石墨烯和Ti~(3+)自掺杂提高二氧化钛纳米管的导电性和稳定性[1],ii)N、Si共掺杂二氧化钛纳米棒增强可见光吸收[2],iii)与Bi VO4形成异质结来提高可见光吸收和电子-空穴对的分离[3],iv)与BiOI形成异质结来提高可见光吸收和电子-空穴对的分离[4]。
One of the main challenges facing humanity is the shortage of the fossil fuels and environmental pollution. Hydrogen is considered to be the most attractive renewable energy due to its advantages of abundant and high energy density. Photoelectrochemical water splitting, as a promising method for converting sunlight into hydrogen energy, has attracted considerable attention. Titanium dioxide has been intensively investigated owing to its promising properties, such as suitable band gap position and superior chemical stability. However, the titanium dioxide can only absorb ultraviolet light because of a relatively large band-gap and the recombination of electron-hole pairs is very fast. Therefore, the solar-to-hydrogen efficiency based on the titanium dioxide is extremely low. Thus, the key to utilize the solar energy efficiently is to develop a composite film with high absorption in the visible light, and improve the separation efficiency of photogenerated carriers. We discuss the material designs including: i) RGO modified TiO_2 coupled with Ti~(3+) self-doping to improve the conductivity and stability, ii) N/Si codoped TiO_2 NRs to enhance the visible-light absorption, iii) forming heterojunction with Bi VO_4 for efficient light absorption and charge separation, and iv) coupling with BiOI to realize the simultaneously efficient light absorption and high charge separation. The main research content are as follows:
One of the main challenges facing humanity is the shortage of the fossil fuels and environmental pollution. Hydrogen is considered to be the most attractive renewable energy due to its advantages of abundant and high energy density. Photoelectrochemical water splitting, as a promising method for converting sunlight into hydrogen energy, has attracted considerable attention. Titanium dioxide has been intensively investigated owing to its promising properties, such as suitable band gap position and superior chemical stability. However, the titanium dioxide can only absorb ultraviolet light because of a relatively large band-gap and the recombination of electron-hole pairs is very fast. Therefore, the solar-to-hydrogen efficiency based on the titanium dioxide is extremely low. Thus, the key to utilize the solar energy efficiently is to develop a composite film with high absorption in the visible light, and improve the separation efficiency of photogenerated carriers. We discuss the material designs including: i) RGO modified TiO_2 coupled with Ti~(3+) self-doping to improve the conductivity and stability, ii) N/Si codoped TiO_2 NRs to enhance the visible-light absorption, iii) forming heterojunction with Bi VO_4 for efficient light absorption and charge separation, and iv) coupling with BiOI to realize the simultaneously efficient light absorption and high charge separation. The main research content are as follows:
引文
[1]Zhang,X.;Zhang,B.;Huang,D.;Yuan,H.;Wang,M;Shen,Y.Carbon 2014,80:591.
[2]Zhang,X.;Zhang,B.;Zuo,Z.;Wang,M;Shen,Y.J.Mater.Chem.A 2015,3:10020.
[3]Zhang,X.;Zhang,B.;Cao,K.;Brillet J.;Chen,J.;Wang,M;Shen,Y.J.Mater.Chem.A 2015,3:21630.
[4]Zhang,X.;Yang,H.;Shen Y.;Wang,M.;Wang,M;Shen,Y.Adv.Mater.Interfaces 2016,3:1500273.
[2]Zhang,X.;Zhang,B.;Zuo,Z.;Wang,M;Shen,Y.J.Mater.Chem.A 2015,3:10020.
[3]Zhang,X.;Zhang,B.;Cao,K.;Brillet J.;Chen,J.;Wang,M;Shen,Y.J.Mater.Chem.A 2015,3:21630.
[4]Zhang,X.;Yang,H.;Shen Y.;Wang,M.;Wang,M;Shen,Y.Adv.Mater.Interfaces 2016,3:1500273.