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Diffusionless-Like Transformation Unlocks Pseudocapacitance with Bulk Utilization: Reinventing Fe_(2)O_(3) in Alkaline Electrolyte

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Energy & Environmental Materials 2023年第1期6卷 145-154页

作者： Taowen Dong Wencai Yi Ting Deng Tingting Qin Xianyu Chu He Yang Lirong Zheng Seung Jo Yoo Jin-Gyu Kim Zizhun Wang Yan Wang Wei Zhang Weitao Zheng State Key Laboratory of Automotive Simulation and Control and School of Materials Science&EngineeringKey Laboratory of Automobile Materials MOEand Electron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012China Laboratory of High Pressure Physics and Material Science(HPPMS) School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Beijing Synchrotron Radiation facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China electron microscopy Research Center Korea Basic Science InstituteDaejeon 34133South Korea Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China IKERBASQUE Basque Foundation for ScienceBilbao 48013Spain

Energy density can be substantially raised and even maximized if the bulk of an electrode material is fully *** metal oxides based on conversion reaction mechanism are the imperative choice due to either constructing nanostructure or intercalation pseudocapacitance with their intrinsic ***,the fully bulk utilization of transition metal oxides is hindered by the poor understanding of atomic-level conversion reaction mechanism,particularly it is largely missing at clarifying how the phase transformation(conversion reaction)determines the electrochemical performance such as power density and cyclic ***,α-Fe_(2)O_(3) is a case provided to claim how the diffusional and diffusionless transformation determine the electrochemical behaviors,as of its conversion reaction mechanism with fully bulk utilization in alkaline ***,the discharge productα-FeOOH diffusional from Fe(OH)2 is structurally identified as the atomic-level arch criminal for its cyclic stability deterioration,whereas the counterpartδ-FeOOH is theoretically diffusionless-like,unlocking the full potential of the pseudocapacitance with fully bulk ***,such pseudocapacitance,in proof-of-concept and termed as conversion pseudocapacitance,is achieved via diffusionless-like *** work not only provides an atomic-level perspective to reassess the potential electrochemical performance of the transition metal oxides electrode materials based on conversion reaction mechanism but also debuts a new paradigm for pseudocapacitance.

关键词： bulk utilization,conversion pseudocapacitance diffusionless transformation Fe_(2)O_(3) phase transformation

Achieving ultrahigh electrochemical performance by surface design and nanoconfined water manipulation

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National Science Review 2022年第6期9卷 143-152页

作者： Haisheng Li Kui Xu Pohua Chen Youyou Yuan Yi Qiu Ligang Wang Liu Zhu Xiaoge Wang Guohong Cai Liming Zheng Chun Dai Deng Zhou Nian Zhang Jixin Zhu Jinglin Xie Fuhui Liao Hailin Peng Yong Peng Jing Ju Zifeng Lin Junliang Sun College of Chemistry and Molecular Engineering Beijing National Laboratory for Molecular Sciences Peking University Key Laboratory of Flexible electronics and Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech University core Labs King Abdullah University of Science and Technology electron microscopy Centre of Lanzhou University Lanzhou University School of Chemical and Environmental Engineering China University of Mining and Technology State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Analytical Instrumentation Center Peking University School of Physical Science and Technology Electron Microscopy Centre of Lanzhou University and Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University College of Materials Science and Engineering Sichuan University

The effects of nanoconfined water and the charge storage mechanism are crucial to achieving the ultrahigh electrochemical performance of two-dimensional transition metal carbides(MXenes). We propose a facile method to manipulate nanoconfined water through surface chemistry modification. By introducing oxygen and nitrogen surface groups, more active sites were created for Ti3C2MXene, and the interlayer spacing was significantly increased by accommodating three-layer nanoconfined water. Exceptionally high capacitance of 550 F g-1(2000 F cm-3) was obtained with outstanding high-rate performance. The atomic scale elucidation of the layer-dependent properties of nanoconfined water and pseudocapacitive charge storage was deeply probed through a combination of ‘computational and experimental microscopy’. We believe that an understanding of, and a manipulation strategy for, nanoconfined water will shed light on ways to improve the electrochemical performance of MXene and other two-dimensional materials.

关键词： two-dimensional material, MXene nanoconfined water energy storage mechanism supercapacitors

Segmented tomographic evaluation of structural degradation of carbon support in proton exchange membrane fuel cells

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Journal of Energy Chemistry 2022年第11期31卷 359-367,I0010页

作者： Jung A.Hong Min-Hyoung Jung Sung Yong Cho Eun-Byeol Park Daehee Yang Young-Hoon Kim Sang-Hyeok Yang Woo-Sung Jang Jae Hyuck Jang Hyo June Lee Sungchul Lee Hu Young Jeong Young-Min Kim Department of Energy Science Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Fuel Cell core Parts Development Cell Hyundai Mobis Co.Ltd.Uiwang 16082Republic of Korea electron microscopy&Spectroscopy Team Korea Basic Science Institute(KBSI)Daejeon 34133Republic of Korea Graduate School of Semiconductor Materials and Devices Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea

The variation of the three-dimensional(3D)structure of the membrane electrode of a fuel cell during proton exchange cycling involves the corrosion/compaction of the carbon *** increasing degradation of the carbon structure continuously reduces the electrocatalytic performance of proton exchange membrane fuel cells(PEM-FCs).This phenomenon can be explained by performing 3D tomographic analysis at the ***,conventional tomographic approaches which present limited experimental feasibility,cannot perform such evaluation and have not provided sufficient structural information with statistical significance thus ***,a reliable methodology is required for the 3D geometrical evaluation of the carbon ***,we propose a segmented tomographic approach which employs pore network analysis that enables the visualization of the geometrical parameters corresponding to the porous carbon structure at a high *** approach can be utilized to evaluate the 3D structural degradation of the porous carbon structure after cycling in terms of local surface area,pore size distribution,and their 3D *** geometrical parameters of the carbon body were demonstrated to be substantially reduced owing to the cycling-induced *** information enables a deeper understanding of the degradation phenomenon of carbon supports and can contribute to the development of stable PEM-FC electrodes.

关键词： electron tomography Fuel cell Proton exchange membrane Membrane electrode assembly Carbon corrosion

Coupling effects in QD dimers at sub-nanometer interparticle distance

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Nano Research 2020年第4期13卷 1071-1080页

作者： Carlo Nazareno Dibenedetto Elisabetta Fanizza Rosaria Brescia Yuval Kolodny Sergei Remennik Annamaria Panniello Nicoletta Depalo Shira Yochelis Roberto Comparelli Angela Agostiano Maria Lucia Curri Yossi Paltiel Marinella Striccoli CNR-Istituto per i Processi Chimico-Fisici SS Bari Via Orabona 470125-BariItaly Dipartimento di Chimica Universita degli Studi di Bari Aldo MoroVia Orabona 470125-BariItaly electron microscopy facility Istituto Italiano di Tecnologiavia Morego 3016163 GenovaItaly Department of Applied Physics and the Center for Nanoscience and Nanotechnology Hebrew University of JerusalemJerusalem 9190401Israel

Currently,intensive research efforts focus on the fabrication of meso-structures of assembled colloidal quantum dots(QDs)with original optical and electronic *** collective features originate from the QDs coupling,depending on the number of connected units and their ***,the development of general methodologies to assemble colloidal QD with precise stoichiometry and particle-particle spacing remains a key ***,we demonstrate that dimers of CdSe QDs,stable in solution,can be obtained by engineering QD surface chemistry,reducing the surface steric hindrance and favoring the link between two *** connection is made by using alkyl dithiols as bifunctional linkers and different chain lengths are used to tune the interparticle distance from few nm down to 0.5 *** spectroscopic investigation highlights that coupling phenomena between the QDs in dimers are strongly dependent on the interparticle distance and QD size,ultimately affecting the exciton dissociation efficiency.

关键词： quantum dots dimers surface chemistry dithiols coupling

A Novel Layered Double Hydroxide and Dodecyl Alcohol Assisted PCM Composite with High Latent Heat Storage Capacity and Thermal Conductivity

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Journal of Thermal Science 2024年第2期33卷 537-547页

作者： AL-AHMED Amir SARI Ahmet KHAN Firoz AL-RASHEIDI Masoud Hekimoğlu Gökhan AFZAAL Mohammad A.ALSULAMI Ahmed DAFALLA Hatim SALHI Billel A.ALSULAIMAN Fahad Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Department of Metallurgical and Material Engineering Karadeniz Technical UniversityTrabzon61080Turkey Maths and Natural Sciences Division Higher Colleges of TechnologyP.O.Box 7947SharjahUnited Arab Emirates Department of Mechanical Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia core Research Facilities King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Membranes and Water Security King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia

Dodecyl alcohol(DDA) is a promising solid-liquid phase change material(PCM) due to its favorable latent heat storage(LHS) ***,the leakage issue of PCM in a melted state during the heating period and low thermal conductivity restricts its utilization potential in thermal energy storage(TES) *** the same context,the present work aims to overcome the leakage issue and improve the thermal conductivity of the *** this in mind,a novel leak-proof layered double hydroxide(LDH)/DDA composite PCM is proposed through a solution-based impregnation *** leak-proof impregnation ratio of the DDA impregnated within the cavities of the synthesized Al/Fe-LDH was determined to be 60%.Detailed morphological,physicochemical,and thermal properties of the fabricated composite were studied by scanning electron microscopy(SEM),Fourier transforms infrared(FTIR) spectroscopy,X-ray diffraction(XRD)spectroscopy,differential scanning calorimetry(DSC),thermalgravimetric analysis(TGA),and thermal cycling *** results show that the LDH/DDA composite has a suitable phase change temperature(about 20℃) for passive solar thermal management of building *** composite PCM showed high LHS enthalpy(about136 J/g),good thermal stability,and cycling LHS *** also showed nearly 152% higher thermal conductivity compared to that of pure DDA,ultimately reducing the melting and solidification time of the pure DDA by 44.9% and 45.5%,respectively.

关键词： dodecyl alcohol layered double hydroxide composite PCM thermal conductivity thermal energy storage(TES)

Inverted-design for highly-active hydrogen evolution electrocatalyst of MoS_(2)@Ni_(3)S_(2)core-shell via unlocking the potential of Mo

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颗粒学报:英文版 2023年第6期77卷 56-61页

作者： Chao Song Yuhua Liu Chengxiang Huang Miao Liu Nailin Yue Zunhao Zhang Zizhun Wang Xu Zou Wei Zhang Weitao Zheng Key Laboratory of Automobile Materials MOE School of Materials Science&EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsElectron Microscopy CenterInternational Center of Future ScienceJilin UniversityChangchun130012China

Through inverted-design rather than modifying the generally-assumed S active sites in popular MoS_(2),we unlock the potential of Mo sites and successfully prepared novel MoS_(2)@Ni_(3)S_(2)/NF core-shell nanospheres as a catalyst for the high-performance hydrogen evolution reaction(HER).TheΔGH at the Mo site is optimized via Ni_(3)S_(2)to achieve excellent HER *** low current densities,it has similar activity to the Pt/***,its performance is better than Pt/C at high ***,our catalyst shows a considerable stability at a variety of current densities for 50 h,promising to substitute noble metal catalysts in application of commercial alkaline electrocatalysts.

关键词： Inverted design Hydrogen evolution reaction Electrocatalyst electronicinteraction MoS_(2)@Ni_(3)S_(2)/NF

TDP-43 and Mitochondrial Dysfunction in Neurodegenerative diseases

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TDP-43 and Mitochondrial Dysfunction in Neurodegenerative di...

Discovery of tip induced unconventional superconductivity on Weyl semimetal

中国神经科学学会第十二届全国学术会议

作者： Lu-wen WANG Ju GAO Sandra L.SIEDLAC Hisashi FUJIOKA Xing-long WANG Departments of Pathology Case Western Reserve University/University Hospitals Case Medical Center electron microscopy facility Case Western Reserve University

Objective TAR DNA-binding protein 43（TDP-43, also named ALS10） is a small ubiquitously expressed RNA/DNA binding protein that primarily binds messenger RNAs（m RNAs）, and regulates their post-transcriptional processing. Translocation of TDP-43 from nuclear to cytoplasm is implicated as the cause of neurodegeneration in diverse major neurodegenerative diseases including amyotrophic lateral sclerosis（ALS）, frontotemporal dementia（FTD）, Alzheimer’s disease（AD）, Parkinson’s disease（PD） and Huntington’s disease（HD）. However, the TDP-43 cytoplasmic target remains elusive. Like TDP-43 proteinopathy, mitochondrial dysfunction is a prominent pathological feature of a wide range of neurodegenerative diseases. In this study, we investigate whether and how TDP-43 proteinopathy contributes to mitochondrial dysfunction and neuronal loss. Methods The localization of TDP-43 in mitochondria in patients with ALS, FTD or AD was measured by confocal microscopy, immuno-electron microscopy and subcellular fractionation. And, cell and animal models were employed to test whether the mitochondrial localization of TDP-43 is required for its toxicity on mitochondria and neurons. Results（1） TDP-43 accumulates in mitochondria in patients with ALS, FTD or AD.（2） TDP-43 in mitochondria impairs mitochondrial function.（3） TDP-43 mitochondrial localization is required for its toxicity on neurons. Conclusion Targeting TDP-43 in mitochondria may be a novel therapeutic target for neurodegeneration.

关键词： TDP-43 mitochondria amyotrophic lateral sclerosis frontotemporal dementia Alzheimer’s disease

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Science Bulletin 2017年第6期62卷 425-430页

作者： He Wang Huichao Wang Yuqin Chen Jiawei Luo Zhujun Yuan Jun Liu Yong Wang Shuang Jia Xiong-Jun Liu jian Wei Jian Wang International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing China Center of electron microscopy State Key Laboratory of Silicon Materials School of Materials Sdence and Engineering Zhejiang University Hangzhou 310027 China

Weyl fermion is a massless Dirac fermion with definite chirality,which has been long pursued since *** it has not been observed as a fundamental particle in nature,Weyl fermion can be realized as low-energy excitation around Weyl point in Weyl semimetal,which possesses Weyl fermion cones in the bulk and nontrivial Fermi arc states on the surface. As a firstly discovered Weyl semimetal,Ta As crystal possesses 12 pairs of Weyl points in the momentum space,which are topologically protected against small perturbations. Here,we report for the first time the tip induced superconductivity on Ta As crystal by point contact spectroscopy. The zero bias conductance peak as well as a conductance plateau with double conductance peaks and sharp double dips are observed in the point contact spectra simultaneously,indicating unconventional superconductivity. Our further theoretical study suggests that the induced superconductivity may have nontrivial topology. The present work opens a new route in investigating the novel superconducting states based on Weyl materials.

关键词： Tip induced unconventional superconductivity Topological superconductivity Weyl semimetal TaAs Point contact spectroscopy

Application of the Peierls–Nabarro Model to Symmetric Tilt Low-Angle Grain Boundary with Full Dislocation in Pure Magnesium

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Acta Metallurgica Sinica(English Letters) 2016年第11期29卷 1053-1063页

作者： Tou-Wen Fan Xiu-Bo Yang Jiang-Hua Chen Ling-Hong Liu Ding-Wan Yuan Yong Zhang Cui-Lan Wu Center for High-Resolution electron microscopy College of Materials Science and Engineering Hunan University Department of Applied Physics School of Physics and Electronics Hunan University Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan University College of Science Central South University of Forestry and Technology

Three types of symmetric （1120） tilt low-angle grain boundaries （LAGBs） with array of basal, prismatic, and pyramidal edge full 〈a〉 dislocations in pure Mg have been studied by using the improved Peierls-Nabarro model in combination with the generalized stacking fault energy curve. The results show that with decreasing distance between the dislocations in all the three types of tilt LAGBs, the stress and strain fields are gradually suppressed. The reduction extent of the stress and strain fields decreases from the prismatic to basal to pyramidal dislocations. The variation of dislocation line energy （DLE） for all tilt LAGBs is divided into three stages： DLE changes slightly and linearly when the distance is larger than 300 A, - 10%; DLE declines exponentially and quickly when the distance goes from 300 to 100 A, ,- 70%; and finally, the descent speed lowers when the distance is smaller than 100 A and the dislocation core energy is nearly half of the DLE. The grain boundary energy （GBE） decreases when the tilt angle of LAGB increases from1 ° to 2° for all cases. The tilt LAGB consists of pyramidal dislocations always has the largest GBE, while that with array of prismatic dislo- cations has the smallest one in the whole range. The Peierls stress of dislocation in tilt LAGB is nearly unchanged, the same as that of single dislocation. This work is useful for further study of dissociated dislocation, solute segregation, precipitate nucleation in tilt LAGB and its interaction with single dislocations.

关键词： Tilt grain boundary Generalized stacking fault energy Magnesium alloy Dislocation Peierlsstress