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Pulse-potential electrochemistry to boost real-life application of pseudocapacitive dual-doped polypyrrole

SmartMat 2022年第4期3卷 644-656页

作者： Fang-Fang Sun Wen-Han Li zi-hang Huang Wenping Sun Yuhai Dou Ding Yuan Baohua Jia Tianyi Ma Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials Institute of Clean Energy ChemistryCollege of ChemistryLiaoning UniversityShenyangChina School of Science RMIT UniversityMelbourneVictoriaAustralia School of Materials Science and Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhouChina Shandong Institute of Advanced Technology JinanChina Institute for Superconducting&Electronic Materials University of WollongongWollongongAustralia

Polypyrrole(PPy)is a very promising pseudocapacitive electrode material for ***,the poor electrochemical performances and cycling stability caused by volumetric change and counterion drain severely limited its practical application and ***,we present a pulsepotential polymerization strategy for uniformly depositing a dual-doped PPy with ordered and shorter molecular structure by balancing the concentration *** a strategy ensures more homogeneous stress distribution of PPy during ultralong cycling tests and improves the cycle ***,the pulse-potential polymerized PPy with dual anion doping behavior induces enhanced protonation level and improved electrical conductivity,which boosting the charge transfer ***,the as-synthesized PPy exhibits a remarkable capacitance performance(7250 mF/cm^(2)@3 mA/cm^(2)),outstanding rate capability(3073 mF/cm^(2)@200 mA/cm^(2))and a long cycle *** assembled symmetric and asymmetric supercapacitors(ASC)exhibit good energy densities(0.8 mWh/cm^(2) for ASC and 0.5 mWh/cm^(2) for symmetric supercapacitor),and excellent durability with zero capacitive loss after 35,000 *** addition,we have fabricated small pouch devices,which can effectively operate a variety of electronic products(including the high-voltage 5 V smartphone,and tablet)and well withstand the external extreme tests during operation,demonstrating the quantitative investigation of the real-life application of aqueous supercapacitors.

关键词： dual-doping energy storage polypyrrole pouch-type device pseudocapacitive pulse-potential polymerization

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Surface‑Alloyed Nanoporous zinc as Reversible and Stable Anodes for High‑Performance Aqueous zinc‑Ion Battery

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Nano-Micro Letters 2022年第8期14卷 58-71页

作者： Huan Meng Qing Ran Tian-Yi Dai hang Shi Shu-Pei Zeng Yong-Fu Zhu zi Wen Wei Zhang Xing-You Lang Wei-Tao Zheng Qing Jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationSchool of Materials Science and Engineeringand Electron Microscopy CenterJilin UniversityChangchun 130022People’s Republic of China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022People’s Republic of China

Metallic zinc(Zn)is one of the most attractive multivalent-metal anode materials in post-lithium batteries because of its high abundance,low cost and high theoretical ***,it usually suffers from large voltage polarization,low Coulombic efficiency and high propensity for dendritic failure during Zn stripping/plating,hindering the practical application in aqueous rechargeable zinc-metal batteries(AR-ZMBs).Here we demonstrate that anionic surfactant-assisted in situ surface alloying of Cu and Zn remarkably improves Zn reversibility of 3D nanoporous Zn electrodes for potential use as high-performance AR-ZMB anode *** a result of the zincophilic ZnxCuy alloy shell guiding uniform Zn deposition with a zero nucleation overpotential and facilitating Zn stripping via the ZnxCuy/Zn galvanic couples,the self-supported nanoporous ZnxCuy/Zn electrodes exhibit superior dendrite-free Zn stripping/plating behaviors in ambient aqueous electrolyte,with ultralow polarizations under current densities up to 50 mA cm^(‒2),exceptional stability for 1900 h and high Zn *** enables AR-ZMB full cells constructed with nanoporous ZnxCuy/Zn anode and K_(z)MnO_(2)cathode to achieve specific energy of as high as~430 Wh kg^(‒1)with~99.8%Coulombic efficiency,and retain~86%after long-term cycles for>700 h.

关键词： Nanoporous metal zinc-based alloy anode Aqueous zinc-ion batteries Surface alloying

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Intermetallic Cu_(5)Zr Clusters Anchored on Hierarchical Nanoporous Copper as Efficient Catalysts for Hydrogen Evolution Reaction

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Research 2020年第1期2020卷 510-521页

作者： hang Shi Yi-Tong Zhou Rui-Qi Yao Wu-Bin Wan Qing-Hua Zhang Lin Gu zi Wen Xing-You Lang Qing Jiang Key Laboratory of Automobile Materials(Jilin University) Ministry of Educationand School of Materials Science and EngineeringJilin UniversityChangchun 130022China Beijing National Laboratory for Condensed Matter Physics The Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Designing highly active and robust platinum-free electrocatalysts for hydrogen evolution reaction is vital for large-scale and efficient production of hydrogen through electrochemical water ***,we report nonprecious intermetallic Cu_(5)Zr clusters that are in situ anchored on hierarchical nanoporous copper(NP Cu/Cu_(5)Zr)for efficient hydrogen evolution in alkaline *** virtue of hydroxygenated zirconium atoms activating their nearby Cu-Cu bridge sites with appropriate hydrogenbinding energy,the Cu_(5)Zr clusters have a high electrocatalytic activity toward the hydrogen evolution *** with unique architecture featured with steady and bicontinuous nanoporous copper skeleton that facilitates electron transfer and electrolyte accessibility,the self-supported monolithic NP Cu/Cu_(5)Zr electrodes boost violent hydrogen gas release,realizing ultrahigh current density of 500mAcm^(-2) at a low potential of-280mV versus reversible hydrogen electrode,with exceptional stability in 1M KOH *** electrochemical properties outperform those of state-of-the-art nonprecious metal electrocatalysts and make them promising candidates as electrodes in water splitting devices.

关键词： solution reaction. exceptional

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Simulation and test of the SLEGS TOF spectrometer at SSRF

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Nuclear Science and Techniques 2023年第3期34卷 171-184页

作者： Kai-Jie Chen Long-Xiang Liu zi-Rui Hao Yu-Gang Ma Hong-Wei Wang Gong-Tao Fan Xi-Guang Cao hang-Hua Xu Yi-Fei Niu Xin-Xiang Li Xin-Rong Hu Yu-Xuan yang Sheng Jin Pan Kuang School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China University of Chinese Academy of Science Beijing 100080China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China School of Nuclear Science and Technology University of South ChinaHengyang 421001China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450052China

The Shanghai laser electron gamma source(SLEGS)is a powerful tool for exploring photonuclear physics,such as giant dipole resonance(GDR)and pygmy dipole resonance,which are the main mechanisms of collective nuclear *** goal of the SLEGS neutron time-of-flight(TOF)spectrometer is to measure GDR and specific nuclear structures in the energy region above the neutron *** SLEGS TOF spectrometer was designed to hold 20 sets of EJ301 and LaBr3 ***4 was used to simulate the efficiency of each detector and the entire spectrometer,which provides a reference for the selection of detectors and layout of the SLEGS TOF *** the events of 208Pb,implementations of coincidence and time-of-flight technology for complex experiments are available;thus,and neutron decay events can be *** performance of SLEGS TOF spectrometer was systematically evaluated using offline experiments,in which the time resolution reached approximately 0.9 ns.

关键词： SLEGS Time-of-flight Photoneutron nuclear reaction

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High quality PdTe_2 thin films grown by molecular beam epitaxy

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Chinese Physics B 2018年第8期27卷 72-76页

作者： En Li Rui-zi Zhang hang Li Chen Liu Geng Li Jia-Ou Wang Tian Qian Hong Ding Yu-yang Zhang Shi-Xuan Du Xiao Lin Hong-Jun Gao Institute of Physics ＆ University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

PdTe2, a member of layered transition metal dichalcogenides （TMDs）, has aroused significant research interest due to the coexistence of superconductivity and type-II Dirac fermions. It provides a promising platform to explore the inter- play between superconducting quasiparticles and Dirac fermions. Moreover, PdTe2 has also been used as a substrate for monolayer antimonene growth. Here in this paper, we report the epitaxial growth of high quality PdTe2 films on bilayer graphene/SiC（0001） by molecular beam epitaxy （MBE）. Atomically thin films are characterized by scanning tunneling microscopy （STM）, X-ray photoemission spectroscopy （XPS）, low-energy electron diffraction （LEED）, and Raman spec- troscopy. The band structure of 6-layer PdTe2 film is measured by angle-resolved photoemission spectroscopy （ARPES）. Moreover, our air exposure experiments show excellent chemical stability of epitaxial PdTe2 film. High-quality PdTe2 films provide opportunities to build antimonene/PdTe2 heterostructure in ultrahigh vacuum for future applications in electronic and optoelectronic nanodevices.

关键词： two-dimensional materials transition-metal dichalcogenides PdTe2, molecular beam epitaxy

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边坡失稳机理的力学解释

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岩土工程学报 2006年第10期28卷 1191-1197页

作者：戴自航卢才金福州大学土木工程学院岩土工程研究所福建福州350002 福建省交通规划设计院福建福州350004

从力学意义上对岩土体屈服破坏行为进行了分析,指出了摩尔-库仑剪切屈服准则在边坡稳定分析中存在的问题,分别采用摩尔-库仑屈服准则和张拉-剪切复合屈服准则对边坡内部最危险滑动面的形成机理进行了直观的解释,并以强度折减有限元法的... 详细信息

从力学意义上对岩土体屈服破坏行为进行了分析,指出了摩尔-库仑剪切屈服准则在边坡稳定分析中存在的问题,分别采用摩尔-库仑屈服准则和张拉-剪切复合屈服准则对边坡内部最危险滑动面的形成机理进行了直观的解释,并以强度折减有限元法的实例分析进行了验证。大量滑坡事故现场踏勘和勘察表明,滑动面的实际情况常与张拉-剪切复合屈服准则的理论分析结果相吻合。

关键词：屈服准则边坡稳定最危险滑动面形成机理强度折减有限元法

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Experimental study of the influencing factors and mechanisms of the pressure-reduction and augmented injection effect by nanoparticles in ultra-low permeability reservoirs

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Petroleum Science 2024年第3期21卷 1915-1927页

作者： Pan Wang Yu-hang Hu Liao-Yuan Zhang Yong Meng Zhen-Fu Ma Tian-Ru Wang zi-Lin Zhang Ji-Chao Fang Xiao-Qiang Liu Qing You Yan Zhang Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering China University of Geosciences(Beijing)Beijing100083China School of Energy Resources China University of Geosciences(Beijing)Beijing100083China Petroleum Engineering Technology Research Institute Sinopec Shengli Oilfield CompanyDongying257000ShandongChina Hekou Oil Production Plant Sinopec Shengli Oilfield CompanyDongying257200ShandongChina Petroleum Exploration and Production Research Institute SINOPECBeijing102206China CNPC Engineering Technology R&D Company Limited Beijing102206China

Nanoparticles(NPs)have gained significant attention as a functional material due to their ability to effectively enhance pressure reduction in injection processes in ultra-low permeability *** are typically studied in controlled laboratory conditions,and their behavior in real-world,complex environments such as ultra-low permeability reservoirs,is not well understood due to the limited scope of their *** study investigates the efficacy and underlying mechanisms of NPs in decreasing injection pressure under various injection conditions(25—85℃,10—25 MPa).The results reveal that under optimal injection conditions,NPs effectively reduce injection pressure by a maximum of 22.77%in core *** pressure reduction rate is found to be positively correlated with oil saturation and permeability,and negatively correlated with temperature and ***,particle image velocimetry(PIV)experiments(25℃,atmospheric pressure)indicate that the pressure reduction is achieved by NPs through the reduction of wall shear resistance and wettability *** work has important implications for the design of water injection strategies in ultra-low permeability reservoirs.

关键词： Nanoparticle Pressure reduction Augmented injection Ultra-low permeability reservoir

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First-principles study of stability of point defects and their effects on electronic properties of GaAs/AlGaAs superlattice

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Chinese Physics B 2022年第3期31卷 434-443页

作者： Shan Feng Ming Jiang Qi-hang Qiu Xiang Hua Peng Hai-Yan Xiao zi-Jiang Liu Xiao-Tao Zu Liang Qiao School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China Department of Physics Lanzhou City UniversityLanzhou 730070China

When the GaAs/AlGaAs superlattice-based devices are used under irradiation environments, point defects may be created and ultimately deteriorate their electronic and transport properties. Thus, understanding the properties of point defects like vacancies and interstitials is essential for the successful application of semiconductor materials. In the present study, first-principles calculations are carried out to explore the stability of point defects in GaAs/Al_(0.5)Ga_(0.5)As superlattice and their effects on electronic properties. The results show that the interstitial defects and Frenkel pair defects are relatively difficult to form, while the antisite defects are favorably created generally. Besides, the existence of point defects generally modifies the electronic structure of GaAs/Al_(0.5)Ga_(0.5)As superlattice significantly, and most of the defective SL structures possess metallic characteristics. Considering the stability of point defects and carrier mobility of defective states,we propose an effective strategy that AlAs, GaAs, and AlGaantisite defects are introduced to improve the hole or electron mobility of GaAs/Al_(0.5)Ga_(0.5)As superlattice. The obtained results will contribute to the understanding of the radiation damage effects of the GaAs/AlGaAs superlattice, and provide a guidance for designing highly stable and durable semiconductor superlattice-based electronics and optoelectronics for extreme environment applications.

关键词： first-principles calculations GaAs/Al_(0.5)Ga_(0.5)As superlattice point defects electronic properties

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Burden of Outpatient Visits Attributable to Ambient Temperature in Qingdao,China

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Biomedical and Environmental Sciences 2021年第5期34卷 395-399页

作者： WANG zi Xian CHENG Yi Bin WANG Yu WANG Yan Zhang Xin hang SONG He Jia LI Yong Hong YAO Xiao Yuan National Institute of Environmental Health Chinese Center for Disease Control and PreventionBeijing 100021China

Climate change has been referred to as one of the greatest threats to human health,with reports citing likely increases in extreme meteorological *** this study,we estimated the relationships between temperature and outpatients at a major hospital in Qingdao,China,during 2015–2017,and assessed the morbidity *** results showed that both low and high temperatures were associated with an increased risk of outpatient visits.

关键词： likely Qingdao extreme

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Transanal total mesorectal excision combined with intersphincteric resection has similar long-term oncological outcomes to laparoscopic abdominoperineal resection in low rectal cancer:a propensity score-matched cohort study

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Gastroenterology Report 2022年第1期10卷 377-385页

作者： Zhi-hang Liu zi-Wei Zeng Hai-Qing Jie Liang Huang Shuang-Ling Luo Wen-Feng Liang Xing-Wei Zhang Liang Kang Department of Colorectal Surgery The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdongP.R.China

Background Transanal total mesorectal excision(taTME)or intersphincteric resection(ISR)has recently proven to be a valid and safe surgical procedure for low rectal ***,studies focusing on the combination of these two technologies are *** study aimed to evaluate perioperative results,long-termoncologic outcomes,and anorectal functions of patients with low rectal cancer undergoing taTME combined with ISR,by comparing with those of patients undergoing laparoscopic abdominoperineal resection(laAPR).Methods After 1:1 propensity score matching,200 patients with low rectal cancer who underwent laAPR(n=100)or taTME combined with ISR(n=100)between September 2013 and November 2019 were *** demographics,clinicopathological characteristics,oncological outcomes,and anal functional results were *** Patients in the taTME-combined-with-ISR group had less intraoperative blood loss(79.6672.6 vs 107.3665.1 mL,P=0.005)and a lower rate of post-operative complications(22.0%vs 44.0%,P<0.001)than those in the laAPR *** overall local recurrence rates were 7.0%in both groups within 3 years after *** 3-year disease-free survival rates were 86.3%in the taTME-combined-with-ISR group and 75.1%in the laAPR group(P=0.056),while the 3-year overall survival rates were 96.7%and 94.2%,respectively(P=0.319).There were 39 patients(45.3%)in the taTME-combined-with-ISR group who developed major low anterior resection syndrome,whereas 61 patients(70.9%)had good post-operative anal function(Wexner incontinence score≤10).Conclusion We found similar long-term oncological outcomes for patients with low rectal cancer undergoing laAPR and those undergoing taTME combined with *** receiving taTME combined with ISR had acceptable post-operative anorectal function.

关键词： rectal cancer transanal totalmesorectal excision laparoscopic abdominoperineal resection oncological outcomes

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