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nitrogen doping/infusion of 650 MHz cavities for CEPC

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Nuclear Science and Techniques 2021年第5期32卷 17-23页

作者： Peng Sha Jian-Kui Hao Wei-Min Pan Lin Lin Hong-Juan Zheng Xin-Ying Zhang Fang Wang Ji-Yuan Zhai Zheng-Hui Mi Fei-Si He Shu Chen Bai-Qi Liu Zhi-Tao Yang Chao Dong Zhong-Quan Li State Key Laboratory of Nuclear Physics and Technology&Institute of Heavy Ion Physics Peking UniversityBeijing 100871China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration Physics and Technology Chinese Academy of SciencesBeijing 100049China Center for Superconducting RF and Cryogenics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

The nitrogen doping/infusion of 650 MHz cavities for the circular electron positron collider(CEPC)is investigated in this *** 650 MHz 1-cell cavities are first treated via buffered chemical polishing(BCP),followed by nitrogen doping.A"2/6"condition is adopted,similar to that for 1.3 GHz cavities of Linear Coherent Light Source *** quality factor of both cavities improved to 7×10^(10)in low fields,i.e.,higher than that obtained from the baseline *** 650 MHz two-cell cavity is nitrogen infused at 165℃for 48 h with a BCP surface *** intrinsic quality factor(Q0)reached6×10^(10)at 22 MV/m in the vertical test,and the maximum gradient is 25 MV/m,which exceeds the specification of the CEPC(4×10^(10)at 22 MV/m).

关键词： Superconducting radio frequency cavity nitrogen doping nitrogen infusion Quality factor Accelerating gradient

Engineered nitrogen doping on VO_(2)(B)enables fast and reversible zinc-ion storage capability for aqueous zinc-ion batteries

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Journal of Energy Chemistry 2023年第10期85卷 30-38,I0003页

作者： Xin Gu Juntao Wang Xiaobin Zhao Xin Jin Yuzhe Jiang Pengcheng Dai Nana Wang Zhongchao Bai Mengdi Zhang Mingbo Wu College of New Energy State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580ShandongChina Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of Wollongong Innovation CampusNorth WollongongNew South Wales 2500Australia Institute of Energy Materials Science(IEMS) University of Shanghai for Science and TechnologyShanghai 200093China

Vanadium-based compounds with high theoretical capacities and relatively stable crystal structures are potential cathodes for aqueous zinc-ion batteries(AZIBs).Nevertheless,their low electronic conductivity and sluggish zinc-ion diffusion kinetics in the crystal lattice are greatly obstructing their practical ***,a general and simple nitrogen doping strategy is proposed to construct nitrogen-doped VO_(2)(B)nanobelts(denoted as VO_(2)-N)by the ammonia heat *** with pure VO_(2)(B),VO_(2)-N shows an expanded lattice,reduced grain size,and disordered structure,which facilitates ion transport,provides additional ion storage sites,and improves structural durability,thus presenting much-enhanced zinc-ion storage *** functional theory calculations demonstrate that nitrogen doping in VO_(2)(B)improves its electronic properties and reduces the zinc-ion diffusion *** optimal VO_(2)-N400 electrode exhibits a high specific capacity of 373.7 mA h g^(-1)after 100 cycles at 0.1 A g^(-1)and stable cycling performance after 2000 cycles at 5 A g^(-1).The zinc-ion storage mechanism of VO_(2)-N is identified as a typical intercalation/de-intercalation process.

关键词： Vanadium dioxide nitrogen doping Cathode materials Aqueous zinc-ion batteries

Effects of nitrogen doping on Microstructures and Irradiation Resistance of Ti-Zr-Nb-V-Mo Refractory High-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1007-1018页

作者： Huanzhi Zhang Tianxin Li Qianqian Wang Zhenbo Zhu Hefei Huang Yiping Lu Engineering Research Center of High Entropy Alloy Materials(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Shanghai Institute of Applied Physics Chinese Academy of Sciences(CAS)Shanghai201800China

Interstitial strengthening with nitrogen(N)is one of the effective ways to improve the mechanical properties of HEAs,but the effects of N on the microstructures and mechanical properties of the irradiated HEAs have not been studied ***,the microstructures and mechanical properties of N-free and N-doped Ti_(2)ZrNbV_(0.5)Mo_(0.2)HEAs before and after He irradiation were *** results showed that the solid solution strengthening caused by interstitial N improved the yield strength at room temperature and 1023 K without significantly reducing plasticity.N doping significantly promoted the growth,aggregation and wider spatial distribution of He bubbles by enhancing the mobility of He atoms/He-vacancy complexes,with the average size of He bubbles increasing from 10.4 nm in N-free HEA to 31.0 nm in N-doped *** addition,N-doped HEA showed a much higher irradiation hardness increment and hardening fraction than N-free *** to conventional materials doped with N,the introduction of N into Ti_(2)ZrNbV_(0.5)Mo_(0.2)HEA had adverse effects on its resistance to He bubble growth and irradiation *** results of this study indicated that N doping may not improve the irradiation resistance of HEAs.

关键词： High-entropy alloys nitrogen doping Mechanical properties Helium bubbles Irradiation resistance

Enhanced pitting corrosion resistance of CoCrFeMnNi high entropy alloy in the presence of Desulfovibrio vulgaris via nitrogen doping

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Journal of Materials Science & Technology 2023年第8期139卷 92-102页

作者： Chuntian Yang Hao Feng Xiaobo Chen Yu Han Huabing Li Dake Xu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang110819China School of Engineering RMIT UniversityCarltonVIC 3053Australia School of Metallurgy Northeastern UniversityShenyang110819China

Corrosion-resistant high nitrogen high entropy alloys(HEAs)were manufactured by pressurized *** work revealed the inhibitory effect of nitrogen on pitting corrosion of HEAs caused by sul-fate reducing bacterium Desulfovibrio *** indicated that HEA-0 N was susceptible to pitting corrosion and sulfidation under attack of ***,whereas the addition of nitrogen significantly de-creased the pitting *** potentials of HEA-0.52 N and HEA-1.23 N increased by 133%and 171%,respectively compared to HEA-0 N in the presence of SRB.X-ray photoelectron spectroscopy results unveiled that nitrogen enriched in passive film and strengthened it by increasing fraction of Cr_(2)O_(3)and Fe^(3+)_(ox).Surface of the nitrogen-alloyed HEAs exhibited less defective passive films as revealed by Mott-Schottky *** doping provides a novel insight into the design of microbial corrosion resistant HEA.

关键词： High entropy alloy Microbiologically influenced corrosion Sulfate reducing bacteria nitrogen doping Pitting corrosion

A high-performance biochar produced from bamboo pyrolysis with in-situ nitrogen doping and activation for adsorption of phenol and methylene blue

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2872-2880页

作者： Zhenhao Li Bo Xing Yan Ding Yunchao Li Shurong Wang State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China

nitrogen doping is a promising method for the preparation of functional carbon *** this study,a nitrogen-doped porous coral biochar was prepared by using bamboo as raw material,urea as nitrogen source,and KHCO3 as green activator through in-situ *** structure of the obtained biochar was characterized by various techniques including nitrogen adsorption and desorption,Raman spectroscopy,X-ray photoelectron spectrometer,and *** adsorption properties of nitrogen-doped biochar were evaluated with phenol and methylene blue *** results showed that the nitrogen source ratio had a significant effect on the evolution of pore structure of *** urea addition ratio was beneficial to the development of pore *** optimum specific surface area of nitrogen-doped biochar could be up to 1693 m^2·g^-*** doping can effectively improve the adsorption capacity of biochar to phenol and methylene *** prepared at 973.15 K with low urea addition ratio exhibited the highest adsorption capacity for phenol and methylene blue,and the equilibrium adsorption capacity was 169.0 mg·g^-1 and 499.3 mg·g^-1,*** comparing the adsorption capacity of various adsorbents in related fields,it is proved that the nitrogen-doped biochar prepared in this study has a good adsorption effect.

关键词： In-situ pyrolysis nitrogen doping Green activator Biochar Adsorption

Impact of nitrogen doping on growth and hydrogen impurity incorporation of thick nanocrystalline diamond films

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Chinese Physics B 2011年第5期20卷 433-438页

作者：顾利萍唐春玖江学范 J.L.Pinto Department of Physics Jiangsu Key Laboratory for Advanced Functional MaterialsChangshu Institute of Technology Department of Physics I3N(Institute for NanostructuresNanomodelling and Nanofabrication)University of AveiroCampus Universita'rio de Santiago3810-193 AveiroPortugal

A much larger amount of bonded hydrogen was found in thick nanocrystalline diamond （NCD） films produced by only adding 0.24% N2 into 4% CH4/H2 plasma, as compared to the high quality transparent microcrystalline diamond （MCD） films, grown using the same growth parameters except for nitrogen. These experimental results clearly evidence that defect formation and impurity incorporation （for example, N and H） impeding diamond grain growth is the main formation mechanism of NCD upon nitrogen doping and strongly support the model proposed in the literature that nitrogen competes with CHx （x = 1, 2, 3） growth species for adsorption sites.

关键词： thick nanocrystalline diamond films nitrogen doping crystalline quality

Selective nitrogen doping on carbon cloth to enhance the performance of zinc anode

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Chinese Chemical Letters 2021年第3期32卷 1095-1100页

作者： Lei Wang Guilan Fan Jiuding Liu Le Zhang Meng Yu Zhenhua Yan Fangyi Cheng Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Renewable Energy Conversion and Storage CenterCollege of ChemistryNankai UniversityTianjin 300071China

Metallic zinc is attractive anode material of rechargeable aqueous Zn-based batteries due to its ambient stability,high volumetric capacity,and abundant ***,Zn anodes suffer from issues such as low coulombic efficiency(CE),large polarization and dendrite ***,uniform Zn electrodeposition is reported on carbon substrates by selective nitrogen *** experimental and theoretical investigations demonstrate that pyrrolic and pyridinic nitrogen doped in carbon play beneficial effect as zinc-philic sites to direct nucleation and growth of metallic Zn,while negligible effect is observed for graphite nitrogen in Zn *** carbon cloth with modified amount of doped pyrrolic and pyridinic nitrogen stabilizes Zn plating/stripping with 99.3%CE after 300 cycles and significantly increases the deliverable capacity at high depth of charge and discharge compared to undoped carbon substrate and Zn *** work provides a better understanding of heteroatom doping effect in design and preparation of stable 3 D carbon-supported zinc anode.

关键词： Zinc Batteries nitrogen doping Carbon substrate Electrodeposition

Effects of nitrogen doping on Microstructure and Photocatalytic Activity of Nanocrystalline TiO_2 Powders

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Journal of Wuhan University of Technology(Materials Science) 2007年第3期22卷 457-461页

作者：杨志远 Dept. of Chemistry and Chemical Engineering Xi’an University of Science and Technology

nitrogen-doped TiO2 nanocrystalline powders were prepared by hydrolysis of tetrachloride titanium （TiCl4） in a mixed solution of ethanol and ammonium nitrate （NH4NO3） at ambient temperature and atmosphere followed by calcination at 400 ℃ for 2 h in air. FTIR spectra demonstrate that amine group in original gel is eliminated by calcination, and the TiO2 powder is liable to absorb water onto its surface and into its capillary pore. XRD and SEM results show that the average size of nanocrystalline TiO2 particles is no more than 60 nm and with increasing the calcination temperature, the size of particles increases. XPS studies indicate the nitrogen atom enters into the TiO2 lattice and occupies the position of oxygen atom. The nitrogen doping not only depresses the grain growth of TiO2 particles, but also reduces the phase transformation temperature of anatase to futile. The photocatalytic activity of the nitrogen-doped TiO2 powders has been evaluated by experiments of photocatalytic degradation aqueous methylene blue.

关键词： titanium oxide nitrogen doping photocatalytic activity nanocrystalline methylene blue

Preparation and Electrochemical Performance of Si@void@NC Composite with a Tunable nitrogen doping Content in the Carbon Layer

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Research and Application of Materials Science 2021年第2期3卷 34-40,I0005页

作者： Yuan QIN Renzhong HUANG Yan DONG Liufen XIA Haoran YU Guodong JIANG Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy School of Materials and Chemical EngineeringHubei University of TechnologyWuhan430068China Qingyuan Jiazhi New Materials Research Institute Co.Ltd. Qingyuan511517China

A strategy for the preparation nitrogen-doped carbon encapsulated Si nanocomposite with a void layer(Si@void@NC)is proposed,in which the nitrogen doping content in the carbon layer is *** and ortho-phenylenediamine are both selected as the nitrogen,carbon sources and co-polymerized on Si@SiO_(2),in which SiO_(2)is functionalized as a void *** and TEM observation show that Si nanoparticles are encapsulated in a hollow and interconnected carbon cages with a thickness of less than 10 nm,which is inclined to agglomerate together to form larger particles in micrometer *** variation of mole ratio of aniline and ortho-phenylenediamine will enable the change of nitrogen doping level in the carbon layer and ranges from 3.2%to 8.4%.The nitrogen is doped into the carbon framework in the form of pyridinic,pyrrolic and graphitic *** tests indicate that the nitrogen content influences the SEI formation and the lithiation of Si *** potential for the decomposition of electrolyte to form SEI film and the alloying of Si-Li negatively shift when the nitrogen doping content is ***,the cycling performance of Si@void@NC is improved when raising the nitrogen content in the *** the optimal nitrogen content is 7.5%,which is corresponding to the mole ratio of aniline to ortho-phenylenediamine is 5:5.

关键词： Silicon anode nitrogen doping Lithium-ion batteries