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Constructing a hollow core-shell structure of RuO_(2) wrapped by hierarchical porous carbon shell with Ru NPs loading for supercapacitor

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Chinese Journal of Chemical Engineering 2023年第3期55卷 93-100页

作者： Lianlian Zhao Fufu Di Xiaonan Wang Sumbal Farid Suzhen Ren State Key Laboratory of Fine Chemicals College of Chemical EngineeringDalian University of TechnologyDalian 116024China

Hollow core-shell structure nanomaterials have been broadly used in energy storage, catalysis, reactor,and other fields due to their unique characteristics, including the synergy between different materials,a large specific surface area, small density, large charge carrying capacity and so on. However, their synthesis processes were mostly complicated, and few researches reported one-step encapsulation of different valence states of precious metals in carbon-based materials. Hence, a novel hollow core-shell nanostructure electrode material, RuO_(2)@Ru/HCs, with a lower mass of ruthenium to reduce costs was constructed by one-step hydrothermal method with hard template and co-assembled strategy, consisting of RuO_(2) core and ruthenium nanoparticles(Ru NPs) in carbon shell. The Ru NPs were uniformly assembled in the carbon layer, which not only improved the electronic conductivity but also provided more active centers to enhance the pseudocapacitance. The RuO_(2) core further enhanced the material’s energy storage capacity. Excellent capacitance storage(318.5 F·g^(-1)at 0.5 A·g^(-1)), rate performance(64.4%) from 0.5 A·g^(-1)to 20 A·g^(-1), and cycling stability(92.3% retention after 5000 cycles) were obtained by adjusting Ru loading to 0.92%(mass). It could be attributed to the wider pore size distribution in the micropores which increased the transfer of electrons and protons. The symmetrical supercapacitor device based on RuO_(2)@Ru/HCs could successfully light up the LED lamp. Therefore, our work verified that interfacial modification of RuO_(2) and carbon could bring attractive insights into energy density for nextgeneration supercapacitors.

关键词： Ruthenium nanoparticles Ruthenium oxide Hollow carbon sphere shell Hierarchical pore structure silica template Hydrothermal method

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Fabricating multi-porous carbon anode with remarkable initial coulombic efficiency and enhanced rate capability for sodium-ion batteries

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Chinese Chemical Letters 2023年第1期34卷 127-132页

作者： Yong Tong Yuanji Wu Zihao Liu Yongshi Yin Yingjuan Sun Hongyan Li College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and ApplicationsJinan UniversityGuangzhou 510632China

Due to the abundant sodium reserves and high safety,sodium ion batteries(SIBs)are foreseen a promising future.While,hard carbon materials are very suitable for the anode of SIBs owing to their structure and cost advantages.However,the unsatisfactory initial coulombic efficiency(ICE)is one of the crucial blemishes of hard carbon materials and the slow sodium storage kinetics also hinders their wide application.Herein,with spherical nano SiO_(2)as pore-forming agent,gelatin and polytetrafluoroethylene as carbon sources,a multi-porous carbon(MPC)material can be easily obtained via a co-pyrolysis method,by which carbonization and template removal can be achieved synchronously without the assistance of strong acids or strong bases.As a result,the MPC anode exhibited remarkable ICE of 83%and a high rate capability(208 m Ah/g at 5 A/g)when used in sodium-ion half cells.Additionally,coupling with Na3V2(PO4)3as the cathode to assemble full cells,the as-fabricated MPC//NVP full cell delivered a good rate capability(146 m Ah/g at 5 A/g)as well,implying a good application prospect the MPC anode has.

关键词： Multi-porous carbon Initial coulombic efficiency Rate capability Sodium ion batteries silica template

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金属有机框架衍生的三维有序多孔碳纳米材料用于高效碱性锌空气电池

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Science China Materials 2022年第6期65卷 1453-1462页

作者：孙秋红朱楷季湘丽陈丹丹韩承黎挺挺胡悦黄少铭钱金杰 Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Research Center of Applied Solid State Chemistry Ningbo UniversityNingbo 315211China School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China

设计和制备高催化活性和高稳定性的非贵金属催化剂对金属-空气电池和燃料电池研究具有重要意义.本文中,我们通过二氧化硅模板法和碳纳米管(CNT)生长对金属有机框架ZIF-8进行碳化,合成了一种分级三维有序多孔碳纳米材料.进一步通过添加铁... 详细信息

设计和制备高催化活性和高稳定性的非贵金属催化剂对金属-空气电池和燃料电池研究具有重要意义.本文中,我们通过二氧化硅模板法和碳纳米管(CNT)生长对金属有机框架ZIF-8进行碳化,合成了一种分级三维有序多孔碳纳米材料.进一步通过添加铁源,高温热解获得的多孔mFeNC-CNT具有精细的Fe基纳米颗粒以及原子分散Fe-Nx位点.三维多孔结构降低了电荷传输阻力,使得铁、氮共掺杂碳表现出与商业Pt/C相当的氧还原反应(ORR)性能.同时,在尿素催化下得到的交织CNT在电化学过程中进一步缩短了离子和电子的扩散途径.实验和理论计算结果表明,优化后的mFeNC-CNT在锌空气电池上表现出较高的ORR活性.综上,这项工作为用于能量存储、转换和传输应用的高性能非贵金属基电催化剂的合理设计和简便合成提供了一种有前景的策略.

关键词： metal-organic framework silica template carbon nanotube oxygen reduction reaction Zn-air battery

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Enzyme-amplified SERS immunoassay with Ag-Au bimetallic SERS hot spots

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Nano Research 2020年第12期13卷 3338-3346页

作者： Xuan-Hung Pham Eunil Hahm Tae Han Kim Hyung-Mo Kim Sang Hun Lee Sang Chul Lee Homan Kang Ho-Young Lee Dae Hong Jeong Hak Soo Choi Bong-Hyun Jun Department of Bioscience and Biotechnology Konkuk UniversitySeoul143-701Republic of Korea Department of Nuclear Medicine Seoul National University Bundang HospitalSeongnam13620Republic of Korea Gordon Center for Medical Imaging Department of RadiologyMassachusetts General Hospital and Harvard Medical SchoolBostonMA02114USA Department of Chemistry Education Seoul National UniversitySeoul151-742Republic of Korea

Surface-enhanced Raman scattering(SERS)enables rapid detection of single molecules with high specificity.However,quantitative and sensitive SERS analysis has been a challenge due to the lack of reliable SERS-active materials.In this study,we developed a quantitative SERS-based immunoassay using enzyme-guided Ag growth on Raman labeling compound(RLC)-immobilized gold nanoparticle(Au NP)-assembled silica NPs(SiO2@Au-RLC@Ag).The enzyme amplified Ag+reduction as well as Ag growth on the RLC-immobilized Au NP-assembled silica NPs(SiO2@Au-RLC),which resulted in a significant increase in SERS signal.In the presence of target antigens such as immunoglobulinG(IgG)or prostate-specific antigen(PSA),Ab1-Antigen-Ab2 immune complex with alkaline phosphatase triggered an enzyme-catalyzed reaction to convert 2-phospho-L-ascorbic acid(2-phospho-L-AA)to ascorbic acid(AA).As produced AA reduced Ag+to Ag,forming an Ag hot spot on the surface of SiO2@Au-RLC,which enhanced the SERS signal of SiO2@Au-RLC@Ag in a solution with a target antigen concentration.The plasmonic immunoassay for IgG detection showed a high linearity of SERS intensity in the range of 0.6 to 9.0 ng/mL with a detection limit(LOD)of 0.09 ng/mL,while an LOD of 0.006 ng/mL was obtained for PSA.The results indicate that the sensitivity of our novel SERS-based immunoassay is higher than that of conventional enzyme-based colorimetric immunoassays.

关键词： surface-enhanced Raman scattering(SERS)-based immunoassay Au-Ag alloy surface-enhanced Raman scattering silica template immunoglobulin G(IgG)detection

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