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Furfural residues derived nitrogen-sulfur co-doped sheet-like carbon: An excellent electrode for dual carbon lithium-ion capacitors

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Green Energy & Environment 2024年第9期9卷 1427-1439页

作者： Xiaoying Guo Yan Qiao Zonglin Yi christian Marcus pedersen Yingxiong Wang Xiaodong Tian Peide Han College of Materials Science and Engineering Taiyuan University of Technology State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Department of Chemistry University of Copenhagen Universitetsparken 5 College of Chemistry Taiyuan University of Technology

The state-of-the-art lithium-ion capacitors （LICs）,consisting of high-capacity battery-type anode and high-rate capacitor-type cathode,can deliver high energy density and large power density when comparing with traditional supercapacitors and lithium-ion batteries,***,the ion kinetics mismatch between cathode and anode leads to unsatisfied cycling lifetime and anode *** efforts have been devoted to solving the abovementioned *** promising strategy is altering high conductive hard carbon anode with excellent structural stability to match with activated carbon cathode,assembling dual-carbon *** this contribution,one-pot in-situ expansion and heteroatom doping strategy was adopted to prepare sheet-like hard carbon,while activated carbon was obtained involving *** persulfate was used as expanding and doping agent *** furfural residues （FR） were served as carbon *** resulting hard carbon （FRNS-HC） and activated carbon （FRNS-AC）show excellent electrochemical performance as negative and positive electrodes in a lithium-ion battery （LIB）.To be specific,374.2 m Ah g-1and 123.1 m Ah g-1can be achieved at 0.1 A g-1and 5 A g-1when FRNS-HC was tested as *** combined with a highly porous carbon cathode (SBET=2961 m2g-1) synthesized from the same precursor,the LIC showed high specific energy of147.67 Wh kg-1at approximately 199.93 W kg-1,and outstanding cycling life with negligible capacitance fading over 1000 *** study could lead the way for the development of heteroatom-doped porous carbon nanomaterials applied to Li-based energy storage applications.

关键词： Furfural residue Ammonium persulfate Sheet-like carbon Lithium-ion capacitors Hard carbon

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Ternary deep eutectic solvents catalyzed D-glucosamine self-condensation to deoxyfructosazine: NMR study

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Green Energy & Environment 2021年第2期6卷 261-270页

作者： Pengfei Liu christian Marcus pedersen Jiaojiao Zhang Rui Liu Zhenzhou Zhang Xianglin Hou Yingxiong Wang Shanxi Engineering Research Center of Biorefinery Instiute of Coal ChemistryChinese Academy of Sciences27 South Taoyucn Road Taiyun030001China Center of Materials Science and Optoeletronics Engineering University of Chinese Academy of SciencesBejing100049China Department of Chemistny University of CopenhagenUniversitetsparken 5DK-2100 CopenhagenDenmark School of Chemical Engineering Zhengzhou University Zhengzhou450001China

Ternary deep eutectic solvents(TDESs) comprising choline chloride(Ch Cl), glycerol and L-arginine were synthesized as catalysts and solvents for the conversion of D-glucosamine(GlcNH_(2)) into deoxyfructosazine(DOF). The interactions between these three components in the prepared TDESs were studied by ^(1)H-,^(35)Cl-NMR spectra and ^(1)H diffusion-ordered spectroscopy(DOSY) measurements. The chemical shift changes of active hydrogen in the ^(1)H-NMR spectra of TDES system and widening of signals in the^(35)Cl-NMR spectra confirmed the hydrogen bonding interaction between the components, which was further supported by the decrease of diffusion coefficients(D) of the TDES components according to ^(1)H DOSY measurements. The influences of reaction temperature and L-arginine content in the TDESs on the yield of DOF were also studied. The experimental results have shown that when the molar ratio of Ch Cl, glycerol, and L-arginine was 1:2:0.1, DOF was the major product with a yield of 22.6% at 90℃ for 120 min. The chemical shift titration indicated that the carboxyl group of L-arginine in the TDES is the catalytical active site, so the mechanism of the catalytic reaction between Glc NH_(2) and the TDES was proposed. Moreover, a reaction intermediate, dihydrofructosazine, was identified in the self-condensation reaction of Glc NH_(2) by an in situ ^(1)H NMR technique.

关键词： Ternary deep eutectic solvents Hydrogen bonding NMR D-glucosamine Deoxyfructosazine

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Characterization of the acidity and basicity of green solvents by NMR techniques

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Magnetic Resonance Letters 2021年第1期1卷 81-88页

作者： Kemeng Shi christian Marcus pedersen Hui Chang Jing Shi Yingxiong Wang Yan Qiao Institute of Coal Chemistry Chinese Academy of SciencesTaiyuan030001China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Department of Chemistry University of CopenhagenDK-2100 CopenhagenDenmark Sinopec Shanghai Petrochemical Co. Ltd.Shanghai200540China

The acidity and basicity of the solvents can influence the reaction outcome notably,and hence the precise measurement of pH is important for ***,not all the pH values of organic solvents can be determined with a classic pH meter *** this research,the acidity and basicity of environmentally friendly green solvents,such as ZnCl_(2) molten salt hydrate,ionic liquids(ILs)and deep eutectic solvents(DESs),were characterized by 31P and 1 H NMR spectroscopy using trimethylphosphine oxide(TMPO)and pyrrole as probe molecules at 298 *** the ZnCl_(2) molten salt hydrate,the acidic strength of the ZnCl_(2) molten salt hydrate increased with the concentration of ZnCl_(2).By using the ^(1)H-pyrrole NMR approach,it was found that the base strength of amino acid-based ILs follows the order:[Ch][Lys]>[Ch][His].

关键词： Green solvents Acidity Basicity ^(31)P-TMPO NMR ^(1)H-pyrrole NMR

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NMR diffusion analysis of catalytic conversion mixtures from lignocellulose biomass using PSYCHE-iDOSY

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Green Energy & Environment 2023年第5期8卷 1409-1416页

作者： Qi Zhao christian Marcus pedersen Jiamin Wang Rui Liu Yuanli Zhang Xiuyin Yan Zhenzhou Zhang Xianglin Hou Yingxiong Wang Shanxi Engineering Research Center of Biorefinery Institute of Coal ChemistryChinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Department of Chemistry University of CopenhagenUniversitetsparken 5DK-2100CopenhagenDenmark School of Chemical Engineering Zhengzhou University Zhengzhou450001China Shanxi Inspection and Testing Center 106 Changzhi RoadTaiyuan030012China

The component analysis and structure characterization of complex mixtures of biomass conversion remain a challenging ***,developing effective and easy to use techniques is ***-ordered NMR spectroscopy(DOSY)is a non-selective and non-invasive method capable of achieving pseudo-separation and structure assignments of individual compounds from biomass mixtures by providing diffusion coefficients(D)of the ***,the conventional 1H DOSY NMR is limited by crowded resonances when analyzing complex mixtures containing similar chemical structure resulting in similar *** we describe the application of an advanced diffusion NMR method,Pure Shift Yielded by CHirp Excitation DOSY(PSYCHE-iDOSY),which can record high-resolution signal diffusion spectra efficiently separating compounds in model and genuine mixture samples from cellulose,hemicellulose and *** sets of isomers(D-glucose/D-fructose/D-mannose and 1,2-/1,5-pentadiol),homologous compounds(ethylene glycol and 1,2-propylene glycol),model compounds of lignin,and a genuine reaction system(furfuryl alcohol hydrogenolysis with ring opening)were successfully separated in the diffusion *** results show that the ultrahigh-resolution DOSY technique is capable of detecting and pseudo-separating the mixture components of C_(5)/C_(6) sugar conversion products and its derivative hydrogenation/hydrogenolysis from lignocellulose biomass.

关键词： Diffusion NMR Pure shift spectroscopy PSYCHE-iDOSY Mixture analysis Biomass

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NMR studies of stock process water and reaction pathways in hydrothermal carbonization of furfural residue

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Green Energy & Environment 2018年第2期3卷 163-171页

作者： Fen Yue christian Marcus pedersen Xiuyin Yan Yequn Liu Danlei Xiang Caifang Ning Yingxiong Wang Yan Qiao Institute of Coal Chemistry Chinese Academy of Sciences Institute of Process Engineering Chinese Academy of Sciences Department of Chemistry University of Copenhagen Taiyuan Supervision and Testing Station for Quality of Grain Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University

Hydrothermal carbonization(HTC) is a valuable approach to convert furfural residue(FR) into carbon material. The prepared biochars are usually characterized comprehensively, while the stock process water still remains to be studied in detail. Herein, a NMR study of the main components in stock process water generated at different HTC reaction conditions was reported. Various qualitative and quantitative NMR techniques(~1H and ^(13)C NMR,~1H-~1H COSY and ~1H-^(13)C HSQC etc.) especially 1D selective gradient total correlation spectroscopy(TOCSY NMR) were strategically applied in the analysis of HTC stock process water. Without separation and purification, it was demonstrated that the main detectable compounds are 5-hydroxymethylfurfural, formic acid, methanol, acetic acid, levulinic acid, glycerol, hydroxyacetone and acetaldehyde in this complicate mixture. Furthermore, the relationship between the concentration of major products and the reaction conditions(180-240 ℃ at 8 h, and 1-24 h at 240 ℃) was established. Finally, reasonable reaction pathways for hydrothermal conversion of FR were proposed based on this result and our previously obtained characteristics of biochars. The routine and challenging NMR methods utilized here would be an alternative other than HPLC or GC for biomass conversion research and can be extended to more studies.

关键词： NMR Hydrothermal carbonization Furfural residue Stock process water

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Risk of pacemaker implantation after femur fracture in patients with and without a history syncope: a Danish nationwide registry-based follow-up study

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Journal of Geriatric Cardiology 2022年第9期19卷 712-718页

作者： Sara LK Clemmensen Kristian Kragholm Bhupendar Tayal christian Torp-pedersen Søren Kold Peter Søgaard Sam Riahi Department of Cardiology Aalborg University HospitalAalborgDenmark Unit of Clinical Biostatistics and Epi-demiology Aalborg University HospitalAalborgDenmark Department of Clinical Epidemiology Aalborg University HospitalAalborgDenmark Department of Orthopedics Aalborg University HospitalAalborgDenmark Depart-ment of Clinical Institute Aalborg University HospitalAalborgDenmark

BACKGROUND It has previously been described that fall-associated injuries including fractures are commonly observed among patients with ***,knowledge on the risk of pacemaker implantation after admission due to femur fracture from large population-based epidemiologic data is ***,we investigated the risk of pacemaker implanta-tion following femur fracture in patients with and without a history of previous *** All patients with femur fracture between 2005-2017 were identified using the Danish Nationwide Patient *** these,patients already having a pacemaker were *** outcome was one-year risk of pacemaker implanta-tion and secondary outcome was one-year all-cause *** logistic regression was used to obtain absolute and relative risks of the study endpoint in relation to patients with versus without history of syncope and standardized to the age,sex,selected comorbidity and pharmacotherapy distribution of all *** Of 93,093 patients with femur fracture,5508(5.9%)had a history of syncope within five *** with prior syn-cope were slightly older(84 vs.83 years),more often male(33.6%vs.29.4%),and had more often comorbidities relative to those without history of ***-cause mortality was significantly higher among those with previous history of syncope com-pared to those without previous syncope(29.9%vs.28.6%,P=0.021).The relative mortality risk was 1.05(95%CI:1.01−1.09,P=0.021).A total of 695(0.8%)patients underwent pacemaker implantation within 5 years following femur fracture,and a signific-antly higher proportion of patients with syncope had a pacemaker implanted within one year(1.6%vs.0.7%,P<0.001;relative risk,2.01[95%CI:1.55−2.46]).CONCLUSIONS In patients with femur fracture,a history of syncope was significantly associated with a higher one-year risk of pacemaker implantation.

关键词： patients syncope injuries

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Utilizing 3D DOSY NMR in the characterization of organic compounds in coal chemical wastewater

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Magnetic Resonance Letters 2022年第2期2卷 69-79,I0002页

作者： Hui Ma christian M.pedersen Qi Zhao Shiyu Jia Bin Yuan Xianglin Hou Yingxiong Wang Shanxi Engineering Research Center of Biorefinery Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Department of Chemistry University of CopenhagenUniversitetsparken 5DK-2100CopenhagenDenmark State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Center for Magnetic ResonanceWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430071China

Coal chemical wastewater(CCW)with the features of high toxicity and poor biodegradability is a big issue in environmental remediation,posing a great threat to aquatic ecosystems and to human *** complex molecular mixtures are notoriously difficult to characterize without initial physical ***,we present the 3D diffusion ordered spectroscopy(DOSY)analysis for CCW using DOSY-COSY and DOSY-HSQC methods,the advantages of this strategy have been demonstrated in the analysis of mixtures of aliphatic oxygenates and aromatic compounds,before being implemented on a genuine CCW sample in this *** results showed that 3D DOSY is a robust and reliable tool for providing superior resolution and virtual separation of complex pollutants,and can be used as a general approach for structural elucidation.

关键词： Coal chemical wastewater 3D DOSY NMR Analysis Separation Structural characterization

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Carrier lifetime of GeSn measured by spectrally resolved picosecond photoluminescence spectroscopy

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Photonics Research 2020年第6期8卷 788-798页

作者： BRIAN JULSGAARD NILS VON DEN DRIESCH PETER TIDEMAND-LICHTENBERG christian pedersen ZORAN IKONIC DAN BUCA Department of Physics and Astronomy Aarhus UniversityNy Munkegade 120DK-8000 Aarhus CDenmark Peter Grinberg Institute 9(PGI 9) Forschungszentrum Jilich52425 JilichGermany JARA-Institut Green IT RWTH AachenGermany DTU Fotonik Technical University of DenmarkFrederiksborgvej 399DK-4000 RoskildeDenmark Pollard Institute School of Electronic and Electrical EngineeringUniversity of LeedsLeedsUK

We present an experimental setup capable of time resolved photoluminescence spectroscopy for photon energies in the range of0.51 to 0.56 eV with an instrument time response of75 *** detection system is based on optical parametric three wave mixing,operates at room temperature,has spectral resolving power,and is shown to be well suited for investigating dynamical processes in germanium-tin *** particular,the carrier lifetime ofa direct-bandgap Ge1-xSnx film with concentration x=12.5%and biaxial strain-0.55%is determined to be 217±15 ps at a temperature of 20 K.A room-temperature investigation indicates that the variation in this life-time with temperature is very *** characteristics of the photoluminescence as a function of pump fuence are discussed.

关键词： lifetime resolved spectral

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以氧化石墨烯为酸催化剂制备2,5-二甲基-N-苯基吡咯（英文）

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新型炭材料 2017年第2期32卷 160-167页

作者：陈春燕郭晓亚吕广强 christian Marcus pedersen 乔岩侯相林王英雄上海大学环境与化学工程学院上海200444 中国科学院山西煤炭化学研究所山西省生物炼制工程技术研究中心山西太原030001 Department of Chemistry University of Copenhagen 中国科学院山西煤炭化学研究所煤转化重点实验室山西太原030001

介绍了氧化石墨烯作为一种高效且可回收的催化剂应用于2,5-己二酮与苯胺通过Paal-Knorr缩合反应合成N-取代吡咯。研究了反应时间、反应温度、溶剂、催化剂用量以及苯胺与2,5-己二酮的摩尔比对2,5-二甲基-N-苯基吡咯收率的影响。通过原... 详细信息

介绍了氧化石墨烯作为一种高效且可回收的催化剂应用于2,5-己二酮与苯胺通过Paal-Knorr缩合反应合成N-取代吡咯。研究了反应时间、反应温度、溶剂、催化剂用量以及苯胺与2,5-己二酮的摩尔比对2,5-二甲基-N-苯基吡咯收率的影响。通过原位核磁技术在分子水平上跟踪了Paal-Knorr缩合的反应过程。结果表明在25℃下通过氧化石墨烯的催化作用反应6 h后吡咯的最大收率可达到90%。氧化石墨烯易回收,且经5次回收使用后还能表现出很好的循环使用性和高催化性能。

关键词：氧化石墨烯 Paal-Knorr 吡咯非均相酸催化原位核磁

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Real-time high-resolution mid-infrared optical coherence tomography

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Light(Science & Applications) 2019年第1期8卷 1076-1088页

作者： Niels M.Israelsen christian R.Petersen Ajanta Barh Deepak Jain Mikkel Jensen Gunther Hannesschlager Peter Tidemand-Lichtenberg christian pedersen Adrian Podoleanu Ole Bang DTU Fotonik Technical University of Denmark2800 KgsLyngbyDenmark NORBLIS IVS Virumgade 35 DVirum 2830Denmark Research Center for Non-Destructive Testing(RECENDT) Altenberger Straße 694040 LinzAustria NLIR ApS Hirsemarken 1Farum 3520Denmark Applied Optics Group School of Physical SciencesUniversity of KentCanterbury CT27NHUK

The potential for improving the penetration depth of optical coherence tomography systems by using light sources with longer wavelengths has been known since the inception of the technique in the early ***,the development of mid-infrared optical coherence tomography has long been challenged by the maturity and fidelity of optical components in this spectral region,resulting in slow acquisition,low sensitivity,and poor axial *** this work,a mid-infrared spectral-domain optical coherence tomography system operating at a central wavelength of 4μm and an axial resolution of 8.6μm is *** system produces two-dimensional cross-sectional images in real time enabled by a high-brightness 0.9-to 4.7-μm mid-infrared supercontinuum source with a pulse repetition rate of 1 MHz for illumination and broadband upconversion of more than 1-μm bandwidth from 3.58–4.63μm to 820–865 nm,where a standard 800-nm spectrometer can be used for fast *** images produced by the mid-infrared system are compared with those delivered by a state-of-the-art ultra-high-resolution near-infrared optical coherence tomography system operating at 1.3μm,and the potential applications and samples suited for this technology are *** doing so,the first practical mid-infrared optical coherence tomography system is demonstrated,with immediate applications in real-time non-destructive testing for the inspection of defects and thickness measurements in samples that exhibit strong scattering at shorter wavelengths.

关键词： resolution repetition illumination

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