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Origin of Improved Photoelectrochemical Water Splitting in Mixed Perovskite Oxides
Li, Weiwei,Jiang, Kai,Li, Zhongguo,Gong, Shijing,Hoye, Robert L. Z.,Hu, Zhigao,Song, Yinglin,Tian, Chuanmu,Kim, Jongkyoung,Zhang, Kelvin H. L.,Cho, Seungho,MacManus-Driscoll, Judith L. Wiley (John WileySons) 2018 ADVANCED ENERGY MATERIALS Vol.8 No.31
Liu Wenlong,Jiang Weiwei,Yan Chenran,Feng Wei,Wang Dongxia,Zhao Liming,Feng Tingting,Gong Feng 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.11
Li(Ni0.8Co0.15Al0.05)O2 (NCA) cathode material for lithium ion batteries is synthesized by calcining Ni–Co–Al hydroxide or carbonate hydroxide hydrate precursor, which is obtained by hydrothermal method, and the NCA cathode material is hierarchical hollow microspheres with the diameter in the range of 3–5 µm and composed of nanoflakes and/or nanowires. The effect of hydrothermal reaction time on the morphologies and the crystalline quality of the NCA cathode material is investigated on the basis of scanning electron microscopy, X-ray diffraction, and tunneling electron microscopy. The NCA cathode material shows smooth and monotonous charge/discharge characteristics, delivers a reversible capacity as 144.4 mAh/g and retains 90.4% after 50 cycles at a current density of 0.1 C between 2.5 and 4.3 V.
Pengzhao Gao,Pengfei Hu,Wenxiang Wang,Weiwei Gong 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
A porous biomorphic carbon template (BCT) was prepared using a carbonized native aspen under an Ar atmosphere. Microstructural properties of the BCT were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Non-isothermal oxidation properties and the mechanism of the BCT formation were studied by thermogravimetric analysis (TGA). Experimental results show that microstructure of the BCT exhibits a honeycomb interconnected porous network and double-peaked distribution of pore diameters. The BCT phase belongs to amorphous carbon, with an increase of the carbonization temperature, the (002) peak of the XRD spectrum becomes stronger, the interplanar spacing decrease, and the structure of BCT slowly evolved towards that of ideal graphite. The non-isothermal oxidation process of BCT is controlled by a chemical reaction and gas diffusion together, and the two stages have different influences on the whole reaction rate with an increase of the conversion (a). The corresponding activation energy (E a) is also calculated.
Additive-assisted preferential crystallization of racemic component: A case of norvaline
Jie Sun,Yaping Wang,Zhenguo Gao,Junbo Gong,Weiwei Tang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
Herein, we report a successful resolution of L-norvaline, a racemic compound system, performed near theeutectic composition by coupling preferential crystallization with tailor-made additives. The structures ofenantiomer and racemate were characterized by PXRD, DSC, and the enantiomeric purity were measuredby Chiral HPLC. The preferential crystallization process was designed and established from binary meltingphase diagram and ternary solution phase diagram. The effects of supersaturation, solution enantiomercomposition, and seed quantity on the preferential crystallization process were investigated. However, the significant improvements of enantiomeric purity and product yield were demonstratedby additive-assisted preferential crystallization approach using tailor-made additives. These additivesbearing similar structure motifs to norvaline a highly selective binding to the racemate rather than enantiomerand remarkably suppress nucleation of DL-norvaline, the key factor determining the resultantenantiomer purity and separation efficiency. The underly inhibition principle was revealed due to thecentrosymmetric packing of the racemate while the polarity of enantiomer leads to only partial or slightcrystallization suppression. The interesting inhibition mode by tailor-made additives is also believed tobe applicable for other racemic crystallization systems. Our established additive-assisted preferentialcrystallization has showed great potential in the development of separation technology and resolutionof enantiomer from racemic compounds.
Comprehensive analysis of TCR repertoire of COVID-19 patients in different infected stage
Wang Guangyu,Wang Yongsi,Jiang Shaofeng,Fan Wentao,Mo Chune,Gong Weiwei,Chen Hui,He Dan,Huang Jinqing,Ou Minglin,Hou Xianliang 한국유전학회 2022 Genes & Genomics Vol.44 No.7
Background: The current pandemic of coronavirus disease 2019 (COVID-19), transmitted person-to-person by the severe acute respiratory syndrome of coronavirus 2 (SARS-CoV-2), poses a threat to global public health. Objective: In this study, we performed the comprehensive analysis of the T cell receptor (TCR) repertoire may contribute to a more in-depth understanding of the pathogenesis of COVID-19. Methods: A comprehensive immunological analysis was performed to explore the features of the TCR repertoire and identified TCR sequences correlated with SARS-CoV-2 viral antigens. Results: we analyzed the COVID-19 patients' TCR repertoires in peripheral blood mononuclear cells (PBMC) which obtained before (baseline), during (acute), and after rehabilitation (convalescent) by ImmunoSEQ-technology, and found that repertoire features of TCRβ-chain (TCRβ) complementary-determining region 3 (CDR3) in COVID-19 patients were remarkable difference, including decreased TCR diversity, abnormal CDR3 length, difference of TRBV/J gene usage and higher TCR sequence overlap. Besides, we identified some COVID-19 disease-associated TCRβ clones, and the abundance of them changed with the progression of the disease. Importantly, these disease-associated TCRβ clones could be used to distinguish COVID-19 patients from healthy controls with high accuracy. Conclusions: We provide a clear understanding of the TCR repertoire of COVID-19 patients, which lays the foundation for better diagnosis and treatment of COVID-19 patients.
Pengzhao Gao,Bing Yan,Ling Wang,Wei Liu,Weiwei Gong,Xiao-pan Liu 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Influence of calcined temperatures on the microstructure and electrochemical properties of LiFePO4/C nano-particles as well as it’s thermal stability were studied using HRTEM, XRD, electrochemical workstation and TGA. The results indicated that when calcined at 973 K, the LiFePO4/C nano-particles consisted of a well-crystalline LiFePO4 core with size of 58.6-80.1 nm and an amorphous carbon shell with thickness of 2 nm. With the increase of calcined temperature, the electrochemical properties of LiFePO4/C materials increased first and then decreased, it reached maximum when temperature equaled to 973 K. The initial discharge capacity of the sample was 142 mAh/g, the discharge capacity of it maintained 132 mAh/g with capacity retention of 93.0% after 40 cycles. The decomposition reaction of LiFePO4/C material calcined at 973 K occurred at 938.38- 1194.52 K under 10 K • min−1 in N2 atmosphere and corresponded to approximately 5.8% of the total weight. The decomposition mechanism of it consisted of three stages: the first stage was controlled by gas diffusion in carbon shell; the second stage was controlled by chemical reaction and gas diffusion; the third stage was controlled by chemical reaction