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nano self-assembly of fluorophosphate cathode induced by surface energy evolution towards high-rate and stable sodium-ion batteries

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nano Research 2023年第1期16卷 439-448页

作者： Zhen-Yi Gu Yong-Li Heng Jin-Zhi Guo Jun-Ming Cao Xiao-Tong Wang Xin-Xin Zhao Zhong-Hui Sun Shuo-Hang Zheng Hao-Jie Liang Bo Li Xing-Long Wu MOE Key Laboratory for UV Light-Emitting Materials and Technology Northeast Normal UniversityChangchun 130024China Department of Chemistry Northeast Normal UniversityChangchun 130024China Center for Advanced Analytical Science School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Key Laboratory of Hazardous Chemicals Safety and Control Technology School of Chemical and Environmental EngineeringNorth China Institute of Science and TechnologyLangfang 065201China

In the field of materials science and engineering,controlling over shape and crystal orientation remains a tremendous ***,we realize a nano self-assembly morphology adjustment of Na3V2(PO4)2F3(NVPF)material,based on surface energy evolution by partially replacing V3+with aliovalent Mn2+.Crystal growth direction and surface energy evolution,main factors in inducing the nano self-assembly of NVPF with different shapes and sizes,are revealed by high-resolution transmission electron microscope combined with density functional ***,NVPF with a two-dimensional nanosheet structure(NVPF-NS)exhibits the best rate capability with 68 mAh·g−1 of specific capacity at an ultrahigh rate of 20 C and cycle stability with 80.7%of capacity retention over 1,000 cycles at 1 *** significantly,when matched with Se@reduced graphene oxide(rGO)anode,NVPF-NS//Se@rGO sodium-ion full cells display a remarkable long-term stability with a high capacity retention of 93.8%after 500 cycles at 0.5 C and−25°***,experimental and theoretical calculation results manifest that NVPF-NS demonstrates such superior performances,which can be mainly due to its inherent crystal structure and preferential orientation growth of{001}*** work will promise insights into developing novel architectural design strategies for high-performance cathode materials in advanced sodium-ion batteries.

关键词： nano self-assembly sodium-ion batteries cathode fluorophosphate

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Preparation and Characterization of Al_2O_3-TiO_2 Complex Supports by nano-scale self-assembly Technique

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China Petroleum Processing & Petrochemical Technology 2010年第1期12卷 13-16页

作者： Li Kuanbiao Li Ping Wang Dingcong Zhao Shanlin Liaoning University of Petroleum and Petrochemical Technology Fushun 113001 Fushun Research Institute of Petroleum and Petrochemicals

The two-step nano-scale self-assembly technique and the framework structure mechanism for forming mesoporous supports were employed for preparing Al2O3-TiO2 complex supports with large pore volume that were applied for manufacturing the resid hydrotreating catalysts. The influence of different TiO2 contents and calcination temperatures on specific surface area, pore volume and pore size distribution of complex supports was studied. TEM and SEM were employed to characterize the Al2O3-TiO2 complex supports. Test results revealed that the specific surface area of Al2O3-TiO2 complex supports was the largest at a TiO2 mass fraction of 20%, and when the calcination temperature was in the range between 300 ℃ to 700 ℃, the pore distribution of the complex support was stable. Characterization of the complex support by TEM and SEM demonstrated that TiO2 was homo- geneously distributed in the complex support, which was in favor of carrying active components. The Al2O3-TiO2 complex supports can function as the best catalyst support for resid hydrotreating catalysts.

关键词： nano self-assembly alumina titanium dioxide complex support pore structure

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