Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (10): 1648-1658.DOI: 10.1016/S1872-2067(21)63805-6

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In-situ preparation of TiO2/N-doped graphene hollow sphere photocatalyst with enhanced photocatalytic CO2 reduction performance

Libo Wanga,b, Bicheng Zhuc, Bei Chenga, Jianjun Zhanga, Liuyang Zhanga, Jiaguo Yua,b,d()   

  1. aState Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China
    bFoshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan 528200, China
    cLaboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, Hubei, China
    dSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
  • Received:2021-02-06 Accepted:2021-03-16 Online:2021-10-18 Published:2021-06-20
  • Contact: Jiaguo Yu
  • About author:Jiaguo Yu received his BS and MS in chemistry from Central China Normal University and Xi’an Jiaotong University, respectively; his PhD in Materials Science from Wuhan University of Technology (WUT). In 2000, he became a Professor at WUT. His research interests include semiconductor photocatalysis, photocatalytic hydrogen production, CO2 reduction, dye-sensitized and perovskite Solar cells, indoor air purification and adsorption, supercapacitor, electrocatalysis and so on. He is Thomson Reuters "Hottest Researcher" of 2012. His name is also in the lists of 2014−2020 Highly Cited Researchers from Clarivate Analytics (Thomson Reuters) in Materials Science, Chemistry and Engineering. He is Foreign Member of Academia Europaea (The Academy of Europe) (2020), Foreign Fellow of the European Academy of Sciences (2020) and Fellow of the Royal Society of Chemistry (2015). He was appointed as the Associate Editor of Chin. J. Catal. in 2020.
  • Supported by:
    National Natural Science Foundation of China(21905219);National Natural Science Foundation of China(51872220);National Natural Science Foundation of China(51932007);National Natural Science Foundation of China(51961135303);National Natural Science Foundation of China(21871217);National Natural Science Foundation of China(U1905215);National Natural Science Foundation of China(U1705251);Fundamental Research Funds for the Central Universities(WUT: 2019IVB050);Innovative Research Funds of Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(XHD2020-001)

Abstract:

Photocatalytic CO2 conversion efficiency is hampered by the rapid recombination of photogenerated charge carriers. It is effective to suppress the recombination by constructing cocatalysts on photocatalysts with high-quality interfacial contact. Herein, we develop a novel strategy to in-situ grow ultrathin N-doped graphene (NG) layer on TiO2 hollow spheres (HS) with large area and intimate interfacial contact via a chemical vapor deposition (CVD). The optimized TiO2/NG HS nanocomposite achieves total CO2 conversion rates (the sum yield of CO, CH3OH and CH4) of 18.11 μmol g-1 h-1, which is about 4.6 times higher than blank TiO2 HS. Experimental results demonstrate that intimate interfacial contact and abundant pyridinic N sites can effectively facilitate photogenerated charge carrier separation and transport, realizing enhanced photocatalytic CO2 reduction performance. In addition, this work provides an effective strategy for in-situ construction of graphene-based photocatalysts for highly efficient photocatalytic CO2 conversion.

Key words: Ultrathin N-doped graphene layer, Chemical vapor deposition, Intimate interfacial contact, Photocatalytic CO2 reduction, Pyridinic N site