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Two-dimensional C@TiO2/Ti3C2 composite with superior catalytic performance for NaAlH4
Affiliation:1. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, PR China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China;2. Guangdong Provincial Key Laboratory of Advance Energy Storage Materials, South China University of Technology, Guangzhou, 510640, China;3. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Hangzhou, 310013, China;1. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China;2. Water Affairs Research Institute, North China University of Water Resource and Electric Power, Zhengzhou, 450000, China;3. Shandong Jiaotong University, Jinan, 250357, China;1. Eindhoven University of Technology, Department of Chemical Engineering and Chemistry, Den Dolech 2, Postbus 513, 5600 MB Eindhoven, The Netherlands;2. EMPA Swiss Federal Laboratories for Materials Science and Technology, Dept. Energy, Environment and Mobility, CH-8600 Dübendorf, Switzerland;3. Military University of Technology, Institute of Chemistry, 2 Kaliskiego Street, 00-908 Warsaw, Poland;4. Forschungszentrum Jülich IEK-9, D-52425 Jülich, Germany;1. Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Langelandsgade 140, DK-8000 Århus C, Denmark;2. Institute of Materials Research, Materials Technology, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D-21502 Geesthacht, Germany;3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Centro Atómico Bariloche, Av. Bustillo 9500, R8402AGP S. C. de Bariloche, Río Negro, Argentina;4. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, D-14109 Berlin, Germany;5. HASYLAB at DESY, Notkestraße 85, D-22603 Hamburg, Germany
Abstract:Carbon coated titanium dioxide supported on two-dimensional titanium carbide (C@TiO2/Ti3C2) is synthesized by simple annealing under a flowing acetylene (C2H2) atmosphere, and applied to improve the hydriding/dehydriding behavior of sodium alanate (NaAlH4). The results indicate that as-prepared C@TiO2/Ti3C2 composite exhibits excellent catalytic activity. The initial temperature for hydrogen desorption is reduced by 70 °C compared with the pristine sample. About 4.0 wt% hydrogen is released in 13 min at 140 °C. The apparent activation energies (Ea) of 10 wt% C@TiO2/Ti3C2 catalyzing NaAlH4 for the first two-steps dehydrogenation are 72.41 and 64.27 kJ mol?1 respectively. The structural analyses reveal that C@TiO2/Ti3C2 interacts with NaAlH4 by using ball milling and decomposes to form Ti-species which works in combination with carbon to improve the dehydrogenation performance of NaAlH4. This result provides an important progress in the hydrogen storage of NaAlH4 catalyzed by MXene.
Keywords:Hydrogen storage materials  Sodium alanate  Dehydrogenation kinetics  Two-dimensional materials  Catalytic activity
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