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Toward Establishing a Low-cost UAV Coordinated Carbon Observation Network(LUCCN):First Integrated Campaign in China

Advances in Atmospheric Sciences 2024年第1期41卷 1-7页

作者： Dongxu YANG tonghui zhao Lu YAO Dong GUO Meng FAN Xiaoyu REN Mingge LI Kai WU Jing WANG zhaonan CAI Sisi WANG Jiaxu GUO Liangfu CHEN Yi LIU Carbon Neutrality Research Center(CNRC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Middle Atmospheric Physics and Global Environment Observation(LAGEO) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100101China National Remote Sensing Center of China Beijing 100036China The Administrative Center for China’s Agenda 21 Beijing 100862China

In this study,we introduce our newly developed measurement-fed-perception self-adaption Low-cost UAV Coordinated Carbon Observation Network(LUCCN)*** LUCCN primarily consists of two categories of instruments,including ground-based and UAV-based in-situ *** use the GMP343,a low-cost non-dispersive infrared sensor,in both ground-based and UAV-based *** first integrated measurement campaign took place in Shenzhen,China,4 May *** the campaign,we found that LUCCN’s UAV component presented significant data-collecting advantages over its ground-based counterpart owing to the relatively high altitudes of the point emission sources,which was especially obvious at a gas power plant in *** emission flux was calculated by a crosssectional flux(CSF)method,the results of which differed from the Open-Data Inventory for Anthropogenic Carbon dioxide(ODIAC).The CSF result was slightly larger than others because of the low sampling rate of the whole emission cross *** LUCCN system will be applied in future carbon monitoring campaigns to increase the spatiotemporal coverage of carbon emission information,especially in scenarios involving the detection of smaller-scale,rapidly varying sources and sinks.

关键词： CO_(2) measurement networks power station carbon emission cross-sectional flux method

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滇西南宿根甘蔗地土壤大孔隙特征

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四川农业大学学报 2024年第2期42卷 422-429页

作者：张铃悦马建刚赵彤辉西南林业大学生态与环境学院昆明650224

【目的】准确掌握宿根甘蔗土壤孔隙的变化特征,为甘蔗种植中的土壤管理、土壤水文预测预报等提供依据。【方法】采用空间代替时间法结合土壤水分穿透曲线法测定了不同坡度、不同宿根年限、不同土层的甘蔗地土壤大孔隙。【结果】宿根甘蔗... 详细信息

【目的】准确掌握宿根甘蔗土壤孔隙的变化特征,为甘蔗种植中的土壤管理、土壤水文预测预报等提供依据。【方法】采用空间代替时间法结合土壤水分穿透曲线法测定了不同坡度、不同宿根年限、不同土层的甘蔗地土壤大孔隙。【结果】宿根甘蔗地40 cm深土壤大孔隙半径分布在0.3~3.6 mm,随着孔径的增大,土层深度的增加,大孔隙数量显著减少;随着坡度和年限的增加,小于0.6 mm的大孔隙数量减少得更显著;土壤大孔隙平均半径最大为种植后第4年,且年限间差异主要出现在坡地上;坡地大孔隙面积比和平均体积呈现出随着宿根年限增加其值减小的趋势。【结论】甘蔗地宿根管理下,深层及小孔径大孔隙数量减少是主要趋势,应加强深施肥或原位松土管理。

关键词：滇西南宿根甘蔗土壤大孔隙水分穿透曲线

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Synergetic N-doped carbon with MoPd alloy for robust oxygen reduction reaction

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Nano Research 2023年第7期16卷 8996-9002页

作者： Chaojie Cen Wenjing Tang tonghui zhao Yun Song Yun Yang Quanlong Xu Wei Chen Zhejiang Key Laboratory of Carbon Materials College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Synergistic catalysis opens up a new venue to improve the comprehensive application of the ***,a composite catalyst(Mo-Pd@N-C)consisting of the N-doped carbon derived from pyrolysis of spherical polypyrrole and MoPd nanoparticles(NPs)was constructed to emphasize the strong metal-support interaction for robust oxygen reduction reaction(ORR).The enhanced anchoring between the MoPd NPs and the substrate,and the N-species formed on the carbon matrix make the Mo-Pd@N-C deliver excellent performance with a half-wave potential of 0.945 V(*** hydrogen electrode(RHE))for ORR,superior than that of commercial Pt/C(0.86 V).More importantly,it shows a negligible half-wave potential decline(<5 mV)and only~20%of mass activity(MA)attenuation after 30,000 cycles stability test,obviously better than those of Pt/C(~70%of MA attenuation and~30 mV of half-wave potential decline after only 15,000 cycles).This work highlights a novel synergistic method to prolong the life and improve the commercial prospects of the catalysts.

关键词： synergistic catalysis oxygen reduction reaction N-doped carbon MoPd alloy stability

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Tuning the hydrogen and hydroxyl adsorption on Ru nanoparticles for hydrogen electrode reactions via size controlling

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Chinese Chemical Letters 2023年第4期34卷 353-358页

作者： Zhengrong Li Lulu An Min Song tonghui zhao Jingjing Zhang Chang Zhang Zhizhan Li Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Controlling the particle size of catalyst to understand the active sites is the key to design efficient electrocatalysts toward hydrogen electrode reactions including hydrogen oxidation and evolution(HOR/HER).Herein, the hydrogen and hydroxyl adsorption on Ru/C could be effectively tuned for HOR/HER by simple controlling the particle sizes. It is found that the metallic Ru(Ru0) is the active site for HOR/HER, while oxidized Ru(Rux+) will hinder the adsorption and desorption of hydrogen on the catalyst. For the HOR,catalyst with small particles is more efficient, due to it is a three-phase interface reaction of gas on the surface of the catalyst. For the HER, the metallic state of Ru is crucial. The deconvolution of hydrogen peaks indicates that the catalytic sites with low hydrogen binding energy(HBE) shoulder the majority of the HOR activity. CO stripping curve further demonstrates that the stronger hydroxyl species(OHad)affinity is beneficial to promote the HOR performance. The results indicate that the design of efficient HOR/HER catalyst should focus on the balance between particle size and metallic states.

关键词： Hydrogen oxidation reaction Hydrogen evolution reaction Electrocatalysis Ruthenium particle Particle size Hydrogen binding energy

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Theoretical analysis of the elastic Kelvin-Helmholtz instability in explosive weldings

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Defence Technology（防务技术） 2024年第2期32卷 521-528页

作者： Yuanbo Sun Jianning Gou Cheng Wang Qiang Zhou Rui Liu Pengwan Chen tonghui Yang Xiang zhao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Beijing HIWING Scientific and Technological Information Institute Beijing100084China School of Aerospace Engineering Tsinghua UniversityBeijing100084China

By considering the joint effects of the Kelvin-Helmholtz(KH) and Rayleigh-Taylor(RT) instabilities, this paper presents an interpretation of the wavy patterns that occur in explosive welding. It is assumed that the elasticity of the material at the interface effectively determines the wavelength, because explosive welding is basically a solid-state welding process. To this end, an analytical model of elastic hydrodynamic instabilities is proposed, and the most unstable mode is selected in the solid phase. Similar approaches have been widely used to study the interfacial behavior of solid metals in high-energy-density physics. By comparing the experimental and theoretical results, it is concluded that thermal softening,which significantly reduces the shear modulus, is necessary and sufficient for successful welding. The thermal softening is verified by theoretical analysis of the increase in temperature due to the impacting and sliding of the flyer and base plates, and some experimental observations are qualitatively *** summary, the combined effect of the KH and RT instabilities in solids determines the wavy morphology, and our theoretical results are in good qualitative agreement with experimental and numerical observations.

关键词： Explosive welding Hydrodynamic instabilities Elasticity

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Development of red phosphor Li_(8)CaLa_(2)Ta_(2)O_(13):Eu^(3+)for WLEDs and anti-counterfeiting applications

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ChemPhysMater 2024年第2期3卷 194-203页

作者： Jingjing Ru Fan Zeng Bing zhao Chenqing Ye tonghui Zhong Feiyun Guo Jianzhong Chen College of Chemistry and Materials Fujian Province University Key Laboratory of Green Energy and Environment CatalysisNingde Normal UniversityNingde 352100China School of Environment and Resources School of Carbon Neutral and Modern IndustryFujian Normal UniversityFuzhou 350007China College of Information and Mechanical&Electrical Engineering Ningde Normal UniversityNingde 352100China College of Chemistry Fuzhou UniversityFuzhou 350108China

A set of novel red phosphors Li_(8)CaLa_(2)Ta_(2)O_(13):Eu^(3+)(LCLTO:xEu^(3+))were successfully prepared using a solid-state reaction *** properties of the prepared samples,including phase purity,elemental composition,and morphology,were systematically investigated using X-ray diffraction,scanning electron microscopy,and diffuse reflectance spectroscopy *** 610 nm maximum emission peak is attributed to the^(5)D_(0)→^(7)F_(2)transition of Eu^(3+)ion under 394 nm *** all the LCLTO:xEu^(3+)phosphors,LCLTO:0.6Eu^(3+)showed the strongest emission intensity because of the concentration quenching effect of the electric dipole-dipole in-teraction among the Eu^(3+)ions,which was also demonstrated by the decay ***,the emission intensity of the optimal LCLTO:0.6Eu^(3+)phosphor,which exhibited a high internal quantum efficiency of 49.30%and excellent color purity of 96.79%,was approximately 2.29 times higher than that of commercial Y203:Eu^(3+)red *** thermal stability of the LCLTO:0.6Eu^(3+)sample with good color stability was meticulously *** fabricated white-light-emitting diode(WLED)exhibited a superior color-rendering index of Ra=82 and chromaticity coordinates of(0.3260,0.3639),suggesting that LCLTO:0.6Eu^(3+)has potential applicability in developing efficient and high-quality ***,the prepared LCLTO:0.6Eu^(3+)/PDMS composite film demonstrated exceptional flexural resistance and chemical stability,indicating considerable promise for practical anti-counterfeitingapplications.

关键词： Phosphor Tantalate Luminescence LED device

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Boosting alkaline hydrogen electrooxidation on an unconventional fcc-Ru polycrystal

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Journal of Energy Chemistry 2021年第10期30卷 15-22,I0002页

作者： tonghui zhao Dongdong Xiao Yi Chen Xi Tang Mingxing Gong Shaofeng Deng Xupo Liu Jianmin Ma Xu zhao Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physics and Electronics Hunan UniversityChangsha 410082HunanChina Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002HenanChina

Precisely controlling the crystalline phase structure and exposed facets at the atomic level opens up a new avenue for efficient catalyst *** this line,we report an unconventional face-centered cubic(fcc)Ru with twinned structure and stacking-fault defects as a competent electrocatalyst towards alkaline hydrogen oxidation reaction(HOR),which is now a major obstacle for the commercialization of anion exchange membrane fuel cells(AEMFC).With conventional hexagonal close packing(hcp)Ru as the counterpart,a novel scope from the phase-engineering is introduced to identify the activity origin and provide fundamental understanding of the sluggish HOR kinetics in alkaline *** electrochemical analysis assisted by deconvoluting the hydrogen(H)desorption peaks indicates the superior performance of fcc Ru origins from the structure defects and higher proportion of the most active *** calculations,together with CO-stripping voltammograns further corroborate the stronger hydroxyl species(OH^(*))affinity lead to the higher activity on these ***,it also demonstrates the H^(*)adsorption/desorption on polycrystalline Ru among the conventional"hydrogen region"is accompanied by the surface bound OH^(*)in alkaline medium,which is of great significance for subsequent alkaline HOR exploration and catalyst design.

关键词： Anion exchange membrane fuel cells Hydrogen oxidation reaction Phase-engineering Fcc Ru Surface bound OH^(*)

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Facile self-template fabrication of hierarchical nickel-cobalt phosphide hollow nanoflowers with enhanced hydrogen generation performance

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Science Bulletin 2019年第22期64卷 1675-1684页

作者： Xupo Liu Shaofeng Deng Peifang Liu Jianing Liang Mingxing Gong Chenglong Lai Yun Lu tonghui zhao Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Analysis&Testing Center of Xin yang Normal University Xin yang 464000.China

Developing facile methods to construct hierarchical-structured transition metal phosphides is beneficial for achieving high-efficiency hydrogen evolution ***,a self-template strategy of hydrothermal treatment of solid Ni-Co glycerate nanospheres followed by phosphorization is delivered to synthesize hierarchical Ni Co P hollow nanoflowers with ultrathin nanosheet *** microstructure of Ni Co P can be availably tailored by adjusting the hydrothermal treatment temperature through affecting the hydrolysis process of Ni-Co glycerate nanospheres and the occurred Kirkendall *** from the promoted exposure of active sites and affluent mass diffusion routes,the HER performance of the Ni Co P hollow nanoflowers has been obviously enhanced in contrast with the solid Ni Co P *** fabricated Ni Co P hollow nanoflowers yield the current density of 10 m A cmà2at small overpotentials of 95 and 127 m V in 0.5 mol Là1H2SO4and 1.0 mol Là1KOH solution,***,the two-electrode alkaline cell assembled with the Ni Co P and Ir/C catalysts exhibits sustainable stability for overall water *** work provides a simple but efficient method to regulate the microstructure of transition metal phosphides,which is helpful for achieving high-performance hydrogen evolution catalysts based on solid-state metal alkoxides.

关键词： Self-template method Hydrolysis of glycerate nanospheres Kirkendall effect NiCoP hollow nanoflowers Hydrogen evolution reaction

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Insight into the hydrogen oxidation electrocatalytic performance enhancement on Ni via oxophilic regulation of MoO_(2)

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Journal of Energy Chemistry 2021年第3期30卷 202-207页

作者： Shaofeng Deng Xupo Liu Xuyun Guo tonghui zhao Yun Lu Jingyu Cheng Ke Chen Tao Shen Ye Zhu Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Department of Applied Physics The Hong Kong Polytechnic UniversityHung HornHong KongChina

Exploring platinum-group-metal(PGM)free electrocatalysts for hydrogen oxidation reaction(HOR)in alkaline media is essential to the progress of anion exchange membrane fuel cells(AEMFCs).In this work,a Ni/MoO_(2) heterostructure catalyst with comparable HOR activity in alkaline electrolyte with PGM catalyst was prepared by a simple hydrothermal-reduction ***,the Ni/MoO_(2) presents a mass kinetic current density of 38.5 mA mgNi^(-1) at the overpotential of 50 mV,which is higher than that of the best PGM free HOR catalyst reported by ***,the HOR performance of Ni/MoO_(2) under 100 ppm CO shows negligible fading,together with the superior durability,render it significant potential for application in AEMFCs.A particular mechanistic study indicates that the excellent HOR performance is ascribed to the accelerated Volmer step by the incorporation of MoO_(2).The function of MoO_(2) was further confirmed by CO striping experiment on Pt/C-MoO_(2) that MoO_(2) can facilitated OH adsorption thus accelerate the HOR *** account of the high performance and low cost,the Ni/MoO_(2) electrocatalyst encourages the establishment of high performance PGM free catalyst and shows significant potential for application in AEMFCs.

关键词： HOR Oxophilic CO tolerance MoO_(2)

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Highly active N-doped carbon encapsulated Pd-Fe intermetallic nanoparticles for the oxygen reduction reaction

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Nano Research 2020年第9期13卷 2365-2370页

作者： Yezhou Hu Yun Lu Xueru zhao Tao Shen tonghui zhao Mingxing Gong Ke Chen Chenglong Lai Jian Zhang Huolin L.Xin Deli Wang Key laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology) Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of New-Energy Materials Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China Department of Physics and Astronomy University of CaliforniaIrvineIrvineCA 92697USA

Developing highly efficient non-R catalysts for fuel cells and metal-air batteries is highly desirable but still challenging due to the sluggish oxygen reduction reaction(ORR).Herein,a facile and efficient strategy is demonstrated to prepare N-doped carbon encapsulated ordered Pd-Fe intermetallic(O-Pd-Fe@NC/C)nanoparticles via a one-step thermal annealing *** obtained O-Pd-Fe@NC/C nanoparticles show enhanced ORR activity,durability and anti-poisoning capacity in both acid and alkaline *** O-Pd-Fe@NC/C serving as cathode catalyst for Zn-air battery,it exhibits higher voltage platform and superior cycling performance with respect to the Zn-air battery based on the mixture of Pt/C and Ir/C *** enhanced electrocatalytic performance can be ascribed to the formation of face-centered tetragonal(fct)Pd-Fe nanoparticles,the protective action of the N-doped carbon layer and the interface confinement effect between *** in situ formed N-doped carbon shell not only restrains the Pd-Fe ordered intermetallics from aggregating effectively during the thermal annealing process,but also provides a strong anchoring effect to avoid the detachment of Pd-Fe nanoparticles from the carbon support during the potential *** facile carbon encapsulation strategy may also be extended to the preparation of a wide variety of N-doped carbon encapsulated intermetallic compounds for fuel cell application.

关键词： palladium carbon encapsulation strategy ordered intermetallic nanoparticles oxygen reduction reaction(ORR) Zn-air battery

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