Synthetical catalysis of nickel and graphene on enhanced hydrogen storage properties of magnesium |
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| Affiliation: | 1. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, College School of Physics Science and Technology, Guangxi University, Nanning 530004, PR China;2. Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Nanning 530004, Guangxi, PR China;3. Department of Materials Science and Engineering, Baise College, Baise 533000, PR China;1. State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy& School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China;2. Materials Genome Institute, Shanghai University, Shanghai, 200444, China;3. Shanghai Institute of Materials Genome, Shanghai, 200444, China;1. Hydrogen Energy Center, Department of Physics, Banaras Hindu University, Varanasi 221005, India;2. Department of Physics, Banaras Hindu University, Varanasi 221005, India;1. College of Materials Science and Engineering, Nanjing Tech University, 5 Xinmofan Road, Nanjing 210009, PR China;2. Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, PR China;3. School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China;1. Department of Materials Science and Engineering, Indian Institute of Technology, Kanpur 208016, India;2. Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea;1. Guangxi Key Laboratory for Relativistic Astrophysics, Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Novel Battery Materials Research Center of Engineering Technology, College of Physics Science and Technology, Guangxi University, Nanning, 530004, China;2. Guangxi Collaborative Innovation Center of Structure and Performance for New Energy and Materials, School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, China;1. College of Materials Sciences and Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, PR China;2. Central Iron & Steel Research Institute, Advanced Technology & Materials Co., Ltd., Jiangsu JITRI Advanced Energy & Materials Research Institute Co., Ltd. 76 South College Road, Beijing, 100081, PR China;3. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 211816, PR China |
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| Abstract: | Reduced graphene-oxide-supported nickel (Ni@rGO) nanocomposite catalysts were synthesized, and incorporated into magnesium (Mg) hydrogen storage materials with the aim of improving the hydrogen storage properties of these materials. The experimental results revealed that the catalytic effect of the Ni@rGO nanocomposite on Mg was more effective than that of single nickel (Ni) nanoparticles or graphene. When heated at 100 °C, the Mg–Ni and Mg–Ni@rGO composites absorbed 4.70 wt% and 5.48 wt% of H2, respectively, whereas the pure Mg and Mg@rGO composite absorbed almost no hydrogen. The addition of the Ni@rGO composite as a catalyst yielded significant improvement in the hydrogen storage property of the Mg hydrogen storage materials. The apparent activation energy of the pure Mg sample (i.e., 163.9 kJ mol?1) decreased to 139.7 kJ mol?1 and 123.4 kJ mol?1, respectively, when the sample was modified with single rGO or Ni nanoparticles. Under the catalytic action of the Ni@rGO nanocomposites, the value decreased further to 103.5 kJ mol?1. The excellent hydrogen storage properties of the Mg–Ni@rGO composite were attributed to the catalytic effects of the highly surface-active Ni nanoparticles and the unique structure of the composite nanosheets. |
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| Keywords: | Magnesium Hydrogen storage property Ni@rGO nanocomposite Catalysis |
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