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Modulating NH_(2)lewis basicity in CTF-NH_(2)through Donor-Acceptor Groups for Optimizing Photocatalytic Water Splitting

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物理化学学报 2024年第12期40卷 13-14页

作者： Zhao Lu Hu Lv Qinzhuang Liu Zhongliao Wang HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Shenzhen 518000Guangdong ProvinceChina School of Construction Engineering Shenzhen Polytechnic UniversityShenzhen 518000Guangdong ProvinceChina Anhui Province Industrial Generic Technology Research Center for Alumics Materials Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental RemediationSchool of Physics and Electronic InformationHuaibei Normal UniversityHuaibei 235000Anhui ProvinceChina

Photocatalytic water splitting(PWS)provides an optimal approach for the sustainable production of green ***_(2)-modified covalent triazine frameworks(CTFs-NH_(2))hold potential in PWS due to robust light uptake,optimal charge separation,and considerable redox ***,the high surface reaction barriers hinder the efficiency of PWS owing to the conversion difficulty of intermediate *** the lewis basicity of NH_(2)on CTFs offers a feasible route for addressing this *** this work,electron-donating ethyl(C_(2)F_(5))and electronwithdrawing 5-fluoroethyl groups(C_(2)F_(5))are introduced at the para position of amine groups,producing C_(2)F_(5)-CTF-NH_(2)and C_(2)F_(5)-CTF-NH_(2),to adjust the lewis basicity of CTF-NH_(2).Through DFT calculations,the optical properties,excited states,electronic structures,dipole moments,and surface reaction processes of the CTF-NH_(2),C_(2)F_(5)-CTF-NH_(2)and C_(2)F_(5)-CTF-NH_(2)are *** results indicate that the electron-withdrawing C_(2)F_(5)group can decrease the electron density and lewis basicity on NH_(2),thereby lowering the energy barriers for hydrogen and oxygen evolution reactions,effectively ameliorating the PWS efficiency of CTF-NH_(2).This work unveils an innovative approach for donor-acceptor-regulated CTFs for the application of PWS.

关键词： Donor Acceptor Water splitting CTFs lewis basicity

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Enhancing the Activity of N/C Catalyst for Oxygen Reduction Reaction by Fluorination

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材料科学与工程（中英文A版） 2023年第3期13卷 68-81页

作者： Yun Wu Xinyu Lu Jiawei Li Hengchang Lin Maosen Pan Gengyu Cao Yuta Nabae Department of Materials Science and Engineering Guangdong University of Petrochemical TechnologyMaoming 525000China Department of Materials Science and Engineering Tokyo Institute of Technology2-12-1 S8-26OokayamaMeguro-kuTokyo 152-8522Japan

The synthesis of non-metal carbon catalysts with high catalytic activity for ORR(oxygen reduction reaction)in acidic media is a great challenge in the field of PEMFC(proton exchange membrane fuel cells).In this research,N-and F-codoped carbon catalyst with high performance was synthesized from ZIF-8 and NH4F,which are easily prepared structure and common chemical,*** as-prepared catalyst has a high surface area of 789 m2/g and micro-porosity of~2 nm,facilitating more active sites to the ORR and O2 mass transfer in the diffusion of the catalyst matrix,*** prepared N/C(NH4F)catalyst exhibited an onset potential of 0.94 V(***)and a half-wave potential of 0.65 V in 0.1 M HClO4 *** also showed excellent durability in the cycling test of 10,000 times and a degradation shift of half-wave potential 70 mV was *** diffusion-limiting current reached 5.85 mA/cm2 next to the theoretic value of 6 mA/cm2,suggesting that it has plenty of active sites for ORR,which could be attributed to fluorine introduction into the N/C *** proved that the introduction of fluorine into the structure of the N/C catalyst fine-tunes the lewis basic sites of the carbon atoms adjacent to pyridinic and graphitic nitrogen species,facilitating the adsorption of oxygen molecules in the initial step of the *** correlation between the N/C catalyst activity and the fluorination provides new insight into the ORR catalyst design.

关键词： ORR Tafel slope F-doped synergistic effect lewis basicity

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<i>In Vitro</i>Characterization of Cell Surface Properties of 14 Vaginal <i>Lactobacillus</i>Strains as Potential Probiotics

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Advances in Microbiology 2021年第2期11卷 144-155页

作者： Shao-Ji Li Jae-Seong So SignalDT Biotechnologies (SZ) Inc. Shenzhen China Department of Biological Engineering Inha University Incheon Korea

Probiotics are live microorganisms which when administered in adequate amounts confer a health benefit on the host. Human-origin Lactobacillus is a preferable source of probiotic bacteria. This study screened 14 vaginal Lactobacillus strains as probiotic candidates by investigating probiotic-related cell surface characteristics including cell surface hydrophobicity (CSH), lewis acidity/basicity, autoaggregation, and biofilm formation. Moderate to high CSH and autoaggregation, high basicity and low acidity were prevalent in the 14 tested strains. Biofilm formation varied in a large range among the 14 tested strains. CSH showed a high correlation with lewis acidity and autoaggregation, while lewis acidity was highly correlated with autoaggregation and biofilm formation. Four strains were selected as promising probiotic strains. This study was the first one to compare antibiotic sensitivity between biofilm-forming cells and planktonic cells of Lactobacillus species, and found that biofilm-forming cells of a L. fermentum strain had a significantly higher survival rate than planktonic cells in cefotaxime, cefmetazole and tetracycline, but were as sensitive to oxacillin and ampicillin as planktonic cells were.

关键词： Lactobacillus Probiotics Cell Surface Hydrophobicity lewis Acidity lewis basicity Autoaggregation Biofilm Antibiotics

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