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Oxygen-vacancy-anchoring Ni_(x)O_(y) loading towards efficient hydrogen evolution via photo-thermal coupling reaction

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Journal of Energy Chemistry 2021年第10期30卷 77-87,I0003页

作者： Qiliang Wu Zheng Li xuhan Zhang chenyu xu Mingjiang Ni Kefa Cen Yanwei Zhang State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027ZhejiangChina Department of Chemical and Materials Engineering University of AlbertaEdmonton ABT6G 1H9Canada

Oxygen vacancy(Vo)is a significant component in defect *** present work reports the anchoring effects of initial Vo for further loading modifications and the reducing capacity of photoinduced Vo for pure water ***,we propose Ni-loaded Cu-doped TiO_(2)(NCT)materials by successive doping and *** continuously added Ni ions should accumulate around the Vos and gradually grow into complete nickel oxide crystals,achieving a higher average valence state of the Ni *** crystals can be detected on a 0.5%NCT sample,while the structure of Ni_(2)O_(3) has been confirmed with a higher nickel mass ***,the introduction of nickel oxide effectively improves the photochemical and electrochemical performance by the interface charge separation,finally reaching an H2 yield of 30.6 pmol/g-cat on 0.5%NCT for Vo-based photo-thermal coupling reaction,which consists of Vo generation in photo and Vo consumption in thermal *** situ infrared spectroscopy further indicated that the presence of high valence state nickel oxide hindered the H2 formation but effectively promoted the conventional oxidizing reaction,with an H2 yield of 20.6 mmol/g-cat in a methanol-water reaction on the 2.0%NCT *** summary,Vo controls the morphological structure of Ni loading and produces diverse effects for reactions with dissimilar mechanisms,which provides a novel way to design modifications for promoting various chemical reactions.

关键词： Oxygen vacancy Nickel oxide Water splitting Photo-thermal coupling reaction DFT calculation

Regulating the Electron Localization of Metallic Bismuth for Boosting CO_(2)Electroreduction

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Nano-Micro Letters 2022年第2期14卷 296-310页

作者： Dan Wu Renfei Feng chenyu xu Peng-Fei Sui Jiujun Zhang Xian-Zhu Fu Jing-Li Luo Shenzhen Key Laboratory of Polymer Science and Technology Guangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Materials Science and EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Canadian Light Source Inc. SaskatoonSaskatchewan S7N 0X4Canada Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada Institute for Sustainable Energy/College of Science Shanghai UniversityShanghai 200444People’s Republic of China

Electrochemical reduction of CO_(2)to formate is economically attractive but improving the reaction selectivity and activity remains ***,we introduce boron(B)atoms to modify the local electronic structure of bismuth with positive valence sites for boosting conversion of CO_(2)into formate with high activity and selectivity in a wide potential *** combining experimental and computational investigations,our study indicates that B dopant differentiates the proton participations of rate-determining steps in CO_(2)reduction and in the competing hydrogen *** comparing the experimental observations with the density functional theory,the dominant mechanistic pathway of B promoted formate generation and the B concentration modulated effects on the catalytic property of Bi are *** comprehensive study offers deep mechanistic insights into the reaction pathway at an atomic and molecular level and provides an effective strategy for the rational design of highly active and selective electrocatalysts for efficient CO_(2)conversion.

关键词： CO_(2)reduction Bismuth Proton transport Electron localization Boron

Wet environment-induced adhesion and softening of coenzyme-based polymer elastic patch for treating periodontitis

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Bioactive Materials 2024年第5期35卷 259-273页

作者： Ying Qi chenyu xu Zhuodan Zhang Qian Zhang Ziyang xu Xinrui Zhao Yanhong Zhao Chunyan Cui Wenguang Liu School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China School and Hospital of Stomatology Department of OrthodonticsTianjin Medical UniversityTianjin300070China

Periodontitis,a common chronic inflammatory disease caused by pathogenic bacteria,can be treated with diverse biomaterials by loading drugs,cytokines or ***,these biomaterials often show unsatisfactory therapeutic efficiency due to their poor adhesion,short residence time in the wet and dynamic oral cavity and emerging drug *** we report a wet-responsive methacrylated gelatin(GelMA)-stabilized co-enzyme polymer poly(α-lipoic acid)(PolyLA)-based elastic patch with water-induced adhesion and softening *** PolyLA-GelMA,the multiple covalent and hydrogen-bonding crosslinking between PolyLA and GelMA prevent PolyLA depolymerization and slow down the dissociation of PolyLA in water,allowing durable adhesion to oral periodontal tissue and continuous release of LA-based bioactive small molecule in periodontitis wound without resorting external *** with the undifferentiated adhesion behavior of traditional adhesives,this wet-responsive patch demonstrates a favorable periodontal pocket insertion ability due to its non-adhesion and rigidity in dry *** vitro studies reveal that PolyLA-GelMA patch exhibits satisfactory wet tissue adhesion,antibacterial,blood compatibility and ROS scavenging *** the model of rat periodontitis,the PolyLA-GelMA patch inhibits alveolar bone resorption and accelerates the periodontitis healing by regulating the inflammatory *** biomacromolecule-stabilized coenzyme polymer patch provides a new option to promote periodontitis treatment.

关键词： Co-enzyme α-Lipoic acid Wet tissue adhesion Elastic patch Periodontitis

Co-and N-doped carbon nanotubes with hierarchical pores derived from metal-organic nanotubes for oxygen reduction reaction

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Journal of Energy Chemistry 2021年第2期30卷 49-55,I0002页

作者： xuewan Wang Xiuan Xi Ge Huo chenyu xu Pengfei Sui Renfei Feng Xian-Zhu Fu Jing-Li Luo College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060GuangdongChina Department of Chemical and Materials Engineering University of AlbertaEdmonton T6G 1H9AlbertaCanada Canadian Light Source Saskatoon S7N 2V3SaskatchewanCanada

Biomolecules with a broad range of structure and heteroatom-containing groups offer a great opportunity for rational design of promising electrocatalysts via versatile *** this study,uniform folic acid-Co nanotubes(FA-Co NTs) were hydrothermally prepared as sacrificial templates for highly porous Co and N co-doped carbon nanotubes(Co-N/CNTs) with well-controlled size and *** formation mechanism of FA-Co NTs was investigated and FA-Co-hydrazine coordination interaction together with the H-bond interaction between FA molecules was characterized to be the driving force for growth of one-dimensional *** distinct metal-ligand interaction afforded the resultant CNTs rich Co-N_x sites,hierarchically porous structure and Co nanoparticle-embedded conductive network,thus an overall good electrocatalytic activity for oxygen *** tests showed that Co-N/CNTs-900 promoted an efficient 4 e ORR process with an onset potential of 0.908 V ***,a limiting current density of 5.66 mA cm^(-2) at 0.6 V and a H_2 O_2 yield lower than 5%,comparable to that of 20%Pt/C ***,the catalyst revealed very high stability upon continuous operation and remarkable tolerance to methanol.

关键词： Folic acid Metal–organic nanotube Carbon nanotube In situ doping Oxygen reduction

A 24−30 GHz 8-element dual-polarized 5G FR2 phased-array transceiver IC with 20.8-dBm TX OP1dB and 4.1-dB RX NF in 65-nm CMOS

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Journal of Semiconductors 2024年第1期45卷 22-32页

作者： Yongran Yi Dixian Zhao Jiajun Zhang Peng Gu chenyu xu Yuan Chai Huiqi Liu Xiaohu You National Mobile Communication Research Laboratory Southeast UniversityNanjing 211189China Purple Mountain Laboratories Nanjing 211111China Chengdu Xphased Technology Company Ltd. Chengdu 610041China

This article presents an 8-element dual-polarized phased-array transceiver(TRX)front-end IC for millimeter-wave(mm-Wave)5G new radio(NR).Power enhancement technologies for power amplifiers(PA)in mm-Wave 5G phased-array TRX are discussed.A four-stage wideband high-power class-AB PA with distributed-active-transformer(DAT)power combining and multi-stage second-harmonic traps is proposed,ensuring the mitigated amplitude-to-phase(AM-PM)distortions across wide carrier frequencies without degrading transmitting(TX)power,gain and *** and receiving(RX)switching is achieved by a matching network co-designed on-chip T/R *** each TRX element,6-bit 360°phase shifting and 6-bit 31.5-dB gain tuning are respectively achieved by the digital-controlled vector-modulated phase shifter(VMPS)and differential attenuator(ATT).Fabricated in 65-nm bulk complementary metal oxide semiconductor(CMOS),the proposed TRX demonstrates the measured peak TX/RX gains of 25.5/21.3 dB,covering the 24−29.5 GHz *** measured peak TX OP1dB and power-added efficiency(PAE)are 20.8 dBm and 21.1%,*** measured minimum RX NF is 4.1 *** TRX achieves an output power of 11.0−12.4 dBm and error vector magnitude(EVM)of 5%with 400-MHz 5G NR FR2 OFDM 64-QAM signals across 24−29.5 GHz,covering 3GPP 5G NR FR2 operating bands of n257,n258,and n261.

关键词： fifth-generation(5G) power amplifier millimeter-wave transceiver phased-array

Rapid source inversions of the 2023 SE Türkiye earthquakes with teleseismic and strong-motion data

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Earthquake Science 2023年第4期36卷 316-327页

作者： chenyu xu Yong Zhang Sibo Hua xu Zhang Lisheng xu Yuntai Chen Tuncay Taymaz School of Earth and Space Sciences Peking UniversityBeijing 100871China Institute of Geophysics China Earthquake AdministrationBeijing 100081China Istanbul Technical University The Faculty of MinesDepartment of Geophysical Engineering34467 SariyerIstanbulTürkiye

We conducted rapid inversions of rupture process for the 2023 earthquake doublet occurred in SE Türkiye,the first with a magnitude of M_(W)7.8 and the second with a magnitude of M_(W)7.6,using teleseismic and strong-motion *** teleseismic rupture models of the both events were obtained approximately 88 and 55 minutes after their occurrences,*** rupture models indicated that the first event was an asymmetric bilateral event with ruptures mainly propagating to the northeast,while the second one was a unilateral event with ruptures propagating to the *** information could be useful in locating the meizoseismal *** with teleseismic models,the strong-motion models showed relatively higher resolution.A noticeable difference was found for the M_(W)7.6 earthquake,for which the strong-motion models shows a bilateral event,rather than a unilateral event,but the dominant rupture direction is still ***,all strong-motion models are consistent with the teleseismic models in terms of magnitudes,durations,and dominant rupture *** suggests that both teleseismic and strong-motion data can be used for fast determination of major source *** contrast,the strong-motion data would be preferable in future emergency responses since they are recorded earlier and have a better resolution ability on the source ruptures.

关键词： the 2023 earthquake doublet in SE Türkiye fast source inversion teleseismic inversion strong-motion inversion

Fast Inversion of Source Rupture Processes Using Waveforms Recorded by Low-Cost MEMS Seismometers

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Fast Inversion of Source Rupture Processes Using Waveforms R...

Obstructive sleep apnea aggravates neuroinflammation and pyroptosis in early brain injury following subarachnoid hemorrhage via ASC/HIF-1α pathway

2022年中国地球科学联合学术年会

作者： chenyu xu Yong Zhang Peking University

To quickly report the intensities and issue early warnings for large earthquakes,the China Earthquake Administration has established a strong-motion network in 2016-2020,which consists of ～5000 conventional strong-mo... 详细信息

关键词： Fast Inversion of Source Rupture Processes Using Waveforms Recorded by Low-Cost MEMS Seismometers

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Obstructive sleep apnea aggravates neuroinflammation and pyr...

3D printing of functional bioengineered constructs for neural regeneration: a review

中国睡眠研究会第十四届全国学术年会

作者： Jun xu chenyu xu Wei Gu Liang Ye Nanjing First Hospital

Obstructive sleep apnea can worsen the prognosis of subarachnoid hemorrhage. However, the underlying mechanism remains unclear. In this study, we established a mouse model of subarachnoid hemorrhage using the endovascular perforation method and exposed the mice to intermittent hypoxia for 8 hours daily for 2 consecutive days to simulate sleep apnea. We found that sleep apnea aggravated brain edema, increased hippocampal neuron apoptosis, and worsened neurological function in this mouse model of subarachnoid hemorrhage. Then, we established an in vitro HT-22 cell model of hemin-induced subarachnoid hemorrhage/intermittent hypoxia and found that the cells died, and lactate dehydrogenase release increased, after 48 hours. We further investigated the underlying mechanism and found that sleep apnea increased the expression of hippocampal neuroinflammatory factors interleukin-1β, interleukin-18, interleukin-6, nuclear factor κB, pyroptosis-related protein caspase-1, pro-caspase-1, and NLRP3, promoted the proliferation of astrocytes, and increased the expression of hypoxia-inducible factor 1α and apoptosis-associated speck-like protein containing a CARD, which are the key proteins in the hypoxia-inducible factor 1α/apoptosis-associated speck-like protein containing a CARD signaling pathway. We also found that knockdown of hypoxia-inducible factor 1α expression in vitro greatly reduced the damage to HY22 cells. These findings suggest that sleep apnea aggravates early brain injury after subarachnoid hemorrhage by aggravating neuroinflammation and pyroptosis, at least in part through the hypoxia-inducible factor 1α/apoptosis-associated speck-like protein containing a CARD signaling pathway.

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International Journal of Extreme Manufacturing 2023年第4期5卷 87-118页

作者： Hui Zhu Cong Yao Boyuan Wei chenyu xu Xinxin Huang Yan Liu Jiankang He Jianning Zhang Dichen Li State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China NMPA Key Laboratory for Research and Evaluation of Additive Manufacturing Medical Devices Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China Department of Neurosurgery The First Medical CenterChinese PLA General HospitalBeijing 100853People’s Republic of China

Three-dimensional(3D)printing technology has opened a new paradigm to controllably and reproducibly fabricate bioengineered neural constructs for potential applications in repairing injured nervous tissues or producing in vitro nervous tissue ***,the complexity of nervous tissues poses great challenges to 3D-printed bioengineered analogues,which should possess diverse architectural/chemical/electrical functionalities to resemble the native growth microenvironments for functional neural *** this work,we provide a state-of-the-art review of the latest development of 3D printing for bioengineered neural *** 3D printing techniques for neural tissue-engineered scaffolds or living cell-laden constructs are summarized and compared in terms of their unique *** highlight the advanced strategies by integrating topographical,biochemical and electroactive cues inside 3D-printed neural constructs to replicate in vivo-like microenvironment for functional neural *** typical applications of 3D-printed bioengineered constructs for in vivo repair of injured nervous tissues,bio-electronics interfacing with native nervous system,neural-on-chips as well as brain-like tissue models are *** challenges and future outlook associated with 3D printing for functional neural constructs in various categories are discussed.

关键词： 3D printing bioengineered neural constructs neural regeneration nerve tissue engineering nervous tissue models