Light-induced confined growth of amorphous Co doped MoSx nanodots on TiO2 nanoparticles for efficient and stable in situ photocatalytic H2 evolution |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Key Laboratory of Electrochemical Energy Conversion Technology and Application, North Minzu University, Yinchuan, 750021, PR China;2. Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, PR China;1. State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum Beijing, 102249, PR China;2. Department of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum Beijing, 102249, PR China;1. College of Materials Science and Engineering, Qingdao University of Science and Technology, No.53 Zhengzhou Road, Qingdao, Shandong, 266042, PR China;2. Yantai Engineering&Technology College, No.92 Zhujiang Road, Yantai, Shandong, 264006, PR China;1. School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, PR China;2. State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan, 750021, PR China;3. Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan, 750021, PR China;4. Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan, 750021, PR China;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, PR China;2. College of Science, China University of Petroleum (East China), Qingdao 266580, PR China |
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| Abstract: | Amorphous molybdenum sulfide (a-MoSx) prepared by in situ photoreduction method with an abundance of exposed active sites has been identified as an efficient cocatalyst for catalyzing photocatalytic H2 evolution reaction (HER). However, the intrinsic activity of the a-MoSx cocatalyst toward HER is low due to the unfavorable electronic structures of the active sites. Herein, we report a facile light-induced method for the confined growth of transition metal (TM) doped MoSx (a-TM-MoSx) cocatalysts on TiO2 nanoparticles and their catalytic activity for in situ photocatalytic HER. It is found that doping Co into a-MoSx can greatly enhance the activity of resulted a-Co-MoSx cocatalyst for photocatalytic H2 evolution over TiO2 among the transition metal dopants (Co, Ni, Fe, Cu, Zn) tested. The most efficient a-Co-MoSx cocatalyst (Co/Mo = 1/4 and 4 mol% loading) loaded TiO2 (TiO2/a-Co-MoSx) shows a H2 evolution rate of 133.8 μmol h−1, which is 3.3 times higher than that of a-MoSx loaded TiO2 (TiO2/a-MoSx). Moreover, the TiO2/a-Co-MoSx photocatalyst shows excellent recycling H2 evolution stability. The characterization results reveal that a-Co-MoSx cocatalyst can not only effectively capture the photogenerated electrons of TiO2 to greatly enhance the separation efficiency of photogenerated charges but also significantly reduce the overpotential of HER due to the formation of highly active “CoMoS” sites, thus synergistically enhancing the catalytic activity of TiO2/a-Co-MoSx. Moreover, the light-induced growth of a-Co-MoSx on TiO2 is found to readily couple with the in situ photocatalytic HER. Therefore, this work provides a simple and efficient strategy for designing high-performance a-MoSx-based cocatalysts for stable in situ photocatalytic H2 evolution. |
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| Keywords: | Amorphous molybdenum sulfide Transition metals Water splitting |
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