Hydrothermally Treating High-Ti Cinder for a Near Full-Sunlight-Driven Photocatalyst toward Highly Efficient H2 Evolution
- Jiale Xie ,
- Pingping YangPingping YangInstitute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, 2 Tiansheng Road, Chongqing 400715, People’s Republic of ChinaMore by Pingping Yang,
- Chunxian GuoChunxian GuoInstitute of Materials Science and Devices, Suzhou University of Science and Technology, Kerui Road, Suzhou 215009, People’s Republic of ChinaMore by Chunxian Guo,
- Canyu ZhongCanyu ZhongPanxi Science and Technology Innovation Center & Panzhihua Engineering Technology Research Center for Graphene, Panzhihua University, Airport Road, Panzhihua 617000, People’s Republic of ChinaMore by Canyu Zhong,
- Xiaodeng WangXiaodeng WangInstitute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, 2 Tiansheng Road, Chongqing 400715, People’s Republic of ChinaSchool of Physics, Chongqing University, University City South Road, Chongqing 401331, People’s Republic of ChinaMore by Xiaodeng Wang, and
- Chang Ming Li*Chang Ming Li*E-mail: [email protected]Institute of Materials Science and Devices, Suzhou University of Science and Technology, Kerui Road, Suzhou 215009, People’s Republic of ChinaInstitute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, 2 Tiansheng Road, Chongqing 400715, People’s Republic of ChinaMore by Chang Ming Li
A major drawback of conventional photocatalysts like TiO2 is the limit of only working under ultraviolet irradiation. As a solution, visible-light-driven photocatalysts have been explored in recent years but full-sunlight-driven photocatalysts are still lacking. Herein, multielement-codoped (Mn, Fe, Si, Al, S, F, etc.) TiO2 nanomaterials were prepared from an industrial high-Ti cinder (HiTi) by a two-step hydrothermal method using NaOH and NH4F (or H2O) as morphology controlling agents. The prepared HiTi photocatalyst exhibits a strong absorption at near full-sunlight spectrum (300–800 nm). Among all TiO2-based photocatalysts without any noble metal cocatalyst, the photocatalytic H2 evolution rate on NaOH- and H2O-hydrothermally treated HiTi (HiTi-TiO2) is remarkably superior to the reference P25 TiO2 powders by a factor of 3.8 and thus is the highest. However, NaOH- and NH4F-treated HiTi (HiTi-TiO2-F) shows a lower photoreactivity than HiTi-TiO2 does. Mechanistic studies show that the multielement-doped TiO2 can synergistically harvest full span sunlight to greatly increase light absorption, while suppressing the charge recombination and reducing the reaction barriers for efficient water splitting. Importantly, the amount of produced industrial cinder is huge in China, and it is dumped on the ground in very large mounds, which results in serious pollution. This study may open a promising recycling approach to treat the waste for sustainable energy use.
This article is cited by 2 publications.
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