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Rare Metals 2024年第2期43卷 624-634页

作者： Xing-Yuan Zhang Mei-Na Lei Shan Tian Jian-Gan Wang State Key laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an710072China

High-energy-density Li-S batteries are subjected to serious sulfur deactivation and short cycle lifetime caused by undesirable polysulfide shuttle effect and frantic lithium dendrite *** this work,a controllable cage-confinement strategy to fabricate molybdenum carbide(MoC)nanoclusters as a high-efficient sulfiphilic and lithiophilic regulator to mitigate the formidable issues of Li-S batteries is *** sub-2 nm MoC nanoclusters not only guarantee robust chemisorption and fast electrocatalytic conversion of polysulfides to enhance the sulfur electrochemistry,but also homogenize Li^(+) flux to suppress the lithium dendrite *** a consequence,the MoC-modified separator endows the batteries with boosted reaction kinetics,promoted sulfur utilization,and improved cycling stability.A reversible capacity of 701 mAh·g^(−1) at a high rate of 5.0C and a small decay rate of 0.076%per cycle at 1.0C over 600 cycles are *** study offers a rational route for design and synthesis of bifunctional nanoclusers with both sulfiphilicity and lithiophilicity for high-performance Li-S batteries.

关键词： Li-S batteries Nanocluster Electrocatalyst Polysulfide shuttle Li dendrites

Optical and electrical anisotropy regulation engineering of low-dimensional materials toward polarized detection and imaging applications

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Rare Metals 2024年第7期43卷 2968-2993页

作者： Jian-Bin Zhang Nan Zhou Li-Hui Zhang Cong-Hui Shang Jia-Xuan Li Yi Zhao Guo-Hui Jia Ru-Sen Yang Hua Xu Xiao-Bo Li shaanxi joint Key laboratory of graphene Shaanxi Key Laboratory of High-Orbits-Electron Materials and Protection Technology for AerospaceShaanxi Joint Key Laboratory of GrapheneSchool of Advanced Materials and NanotechnologyXidian UniversityXi'an710126China Guangzhou Institute of Technology Xidian UniversityGuangzhou 710068China Xi'an Thermal Power Research Institute Co. LtdXi'an 710054China Key laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an Xi'an 710119China

Polarized-sensitive image sensors are a kind of photodetector with great development potential due to their enhanced ability to detect and identify the target objects from the aspect of spatial,spectral and polarized ***,low-dimensional anisotropic materials with inherent anisotropic properties,ultrathin thickness,tunable bandgap and feasible integration with complementary metal oxide semiconductor(CMOS)fabrication processes have attracted great interest for their facilitation of polarized photodetector devices *** the polarized detection performance of low-dimensional materials to satisfy realistic needs stimulates the exploration of modulation of anisotropic *** this review,we comprehensively introduce the latest research progress in modulating the optical and optoelectronic anisotropy characteristics of low-dimensional *** strategy of anisotropy regulation through crystal structure engineering and coupling system is discussed ***,the latest progress in image recognition applications using anisotropic low-dimensional materials is reviewed in ***,we summarize the challenge and propose future opportunities in the practical application of polarized-sensitive imaging photodetectors based on low-dimensional anisotropic materials.

关键词： Anisotropy Polarized detection Image recognition Low-dimensional materials

Graded Heterojunction Improves Wide-Bandgap Perovskite for Highly Efficient 4-Terminal Perovskite/Silicon Tandem Solar Cells

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Research 2024年第2期2023卷 181-190页

作者： Wenming Chai Lindong Li Weidong Zhu Dazheng Chen Long Zhou He Xi Jincheng Zhang Chunfu Zhang Yue Hao State Key Discipline laboratory of Wide Band Gap Semiconductor Technology&shaanxi joint Key laboratory of graphene School of MicroelectronicsXidian UniversityXi'anShaanxi 710071China Xi'an Baoxin Solar Technology Co. Ltd.Xi'an710071China

Wide-bandgap(WBG)perovskite solar cells(PSCs)are essential for highly efficient and stable silicon/perovskite tandem solar *** this study,we adopted a synthetic strategy with lead thiocyanate(Pb(SCN)_(2))additive and methylammonium chloride(MACl)posttreatment to enhance the crystallinity and improve the interface of WBG perovskite films with a bandgap of 1.68 *** excessive PbI_(2)was formed at grain boundaries and converted into MAPbI_(3-x)Cl_(x)perovskites,which are utilized to form the graded heterojunction(GHJ)and compressive *** is beneficial for passivating nonradiative recombination defects,suppressing halide phase segregation,and facilitating carrier ***,the device with GHJ delivered a champion efficiency of 20.30%and superior stability in ambient air and under 85℃.Finally,we achieved a recorded efficiency of 30.91%for 4-terminal WBG perovskite/TOPCon tandem silicon solar *** findings demonstrate a promising approach for fabricating efficient and stable WBG PSCs through the formation of GHJ.

关键词： perovskite Graded Highly

Regulation of pseudographitic carbon domain to boost sodium energy storage

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Nano Research 2024年第6期17卷 5188-5196页

作者： Zhidong Hou Mingwei Jiang Da Lei Xiang Zhang Yuyang Gao Jian-Gan Wang State Key laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Lab of Graphene(NPU)Xi’an 710072China

Hard carbon anode has shown extraordinary potentials for sodium-ion batteries(SIBs)owing to the cost-effectiveness and advantaged ***,the widespread application of hard carbon is still hindered by the insufficient sodium storage capacity and depressed rate property,which are mainly induced by the undesirable pseudographitic ***,we develop a molten-salt-mediated strategy to regulate the pseudographitic structure of hard carbon with suitable interlayer spacing and enlarged pseudographitic domain,which is conducive to the intercalation capacity and diffusion kinetics of sodium ***,the optimized hard carbon anode delivers a high reversible capacity of 320 mAh·g^(−1),along with superior rate property(138 mAh·g−1 at 2 A·g^(−1))and stable cyclability over 1800 ***,the in situ Raman spectroscopic study and full-cell assembly further investigate the sodium storage mechanism and practical implement of obtained hard *** work pioneers a low-cost and effective route to regulate the pseudographitic structure of hard carbon materials for advanced SIBs.

关键词： pseudographitic structure molten salt hard carbon anode sodium-ion batteries

Surface deterioration dependent on the crystal facets of spinel LiNi_(0.5)Mn_(1.5)O_(4) cathode active material

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Journal of Energy Chemistry 2024年第10期97卷 757-766,I0016页

作者： Qian Li Yan Zhao Jifu Zhu Wujiu Zhang Yi Liu Yaru Cui Chao Shen Keyu Xie School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina State Key laboratory of Solidification Processing Center for Nano Energy MaterialsNorthwestern Polytechnical University and Shaanx joint Laboratory of Graphene(NPU)Xi'an 710072ShaanxiChina shaanxi Union Research Center of University and Enterprise for Cathode Materials of LIBs Xi'an 710072ShaanxiChina CRRC Zhu Zhou Institute Co. Ltd.Zhuzhou 412000HunanChina

The spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)cathode active materials(CAMs)are considered a promising alternative to commercially available cathodes such as layered and polyanion oxide cathodes,primarily due to their notable safety and high energy density,particularly in their single-crystal ***,the industrial application of the LNMO CAMs is severely inhibited due to the interfacial deterioration and corrosion under proton-rich and high-voltage *** study successfully designed and synthesized two typical types of crystal facets-exposed single-crystal LNMO *** tracking the electrochemical deterioration and chemical corrosion evolution,this study elucidates the surface degradation mechanisms and intrinsic instability of the LNMO,contingent upon their crystal ***(111)facet,due to its elevated surface energy,is found to be more susceptible to external attack compared to the(100)and(110)*** study highlights the electrochemical corrosion stability of crystal plane engineering for spinel LNMO CAMs.

关键词： LiNi_(0.5)Mn_(1.5)O_(4) Crystal facets Electrochemical degradation Chemical corrosion Surface energy

Hybrid hard carbon framework derived from polystyrene bearing distinct molecular crosslinking for enhanced sodium storage

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Carbon Energy 2024年第7期6卷 178-190页

作者： Yuqian Qiu Guangshen Jiang Yanxia Su Xinren Zhang Yuxuan Du Xiaosa Xu Qian Ye Jinbo Zhang Miaohan Ban Fei Xu Hongqiang Wang State Key laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'anChina State Key laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouChina shaanxi Yanchang Petroleum(Group)Co. Ltd.Dalian Institute of Chemical Physics Xi'anClean Energy(Chemical)Research InstituteXi'anChina

Exploiting high-performance yet low-cost hard carbon anodes is crucial to advancing the state-of-the-art sodium-ion ***,the achievement of superior initial Coulombic efficiency(ICE)and high Na-storage capacity via low-temperature carbonization remains challenging due to the presence of tremendous defects with few closed ***,a facile hybrid carbon framework design is proposed from the polystyrene precursor bearing distinct molecular bridges at a low pyrolysis temperature of 800℃ via in situ fusion and embedding *** is realized by integrating triazine-and carbonylcrosslinked polystyrene nanospheres during *** triazine crosslinking allows in situ fusion of spheres into layered carbon with low defects and abundant closed pores,which serves as a matrix for embedding the well-retained carbon spheres with nanopores/defects derived from carbonyl ***,the hybrid hard carbon with intimate interface showcases synergistic Na ions storage behavior,showing an ICE of 70.2%,a high capacity of 279.3 mAh g^(-1),and long-term 500 cycles,superior to carbons from the respective precursor and other reported carbons fabricated under the low carbonization *** present protocol opens new avenues toward low-cost hard carbon anode materials for high-performance sodiumion batteries.

关键词： closed pores hybrid hard carbons hypercrosslinking polystyrenes low-temperature carbonization sodium storage

Accelerated Sequential Deposition Reaction via Crystal Orientation Engineering for Low-Temperature,High-Efficiency Carbon-Electrode CsPbBr_(3) Solar Cells

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Energy & Environmental Materials 2024年第1期7卷 168-175页

作者： Zeyang Zhang Weidong Zhu Tianjiao Han Tianran Wang Wenming Chai Jiaduo Zhu He Xi Dazheng Chen Gang Lu Peng Dong Jincheng Zhang Chunfu Zhang Yue Hao State Key Discipline laboratory of Wide Band Gap Semiconductor Technology&shaanxi joint Key laboratory of graphene School of MicroelectronicsXidian UniversityXi'an 710071China Guangzhou Wide Bandgap Semiconductor Innovation Center Guangzhou institute of technologyXidian UniversityGuangzhou 510555China Qinghai Huanghe Hydropower Development CO. LTD.Xining810008China

Low-temperature,ambient processing of high-quality CsPbBr_(3)films is demanded for scalable production of efficient,low-cost carbon-electrode perovskite solar cells(PSCs).Herein,we demonstrate a crystal orientation engineering strategy of PbBr_(2)precursor film to accelerate its reaction with CsBr precursor during two-step sequential deposition of CsPbBr_(3)*** a novel strategy is proceeded by adding CsBr species into PbBr_(2)precursor,which can tailor the preferred crystal orientation of PbBr_(2)film from[020]into[031],with CsBr additive staying in the film as CsPb_(2)Br_(5)*** calculations show that the reaction energy barrier of(031)planes of PbBr_(2)with CsBr is lower about 2.28 eV than that of(O2O)***,CsPbBr_(3)films with full coverage,high purity,high crystallinity,micro-sized grains can be obtained at a low temperature of 150℃.Carbon-electrode PSCs with these desired CsPbBr_(3)films yield the record-high efficiency of 10.27%coupled with excellent operation ***,the 1 cm^(2)area one with the superior efficiency of 8.00%as well as the flexible one with the champion efficiency of 8.27%and excellent mechanical bending characteristics are also achieved.

关键词： carbon-electrode perovskite solar cells crystal orientation engineering CsPbBr_(3) low temperature two-step sequential deposition

Synthetic strategy of biomimetic sea urchin-like Co-NC@PANI modified MXene-based magnetic aerogels with enhanced electromagnetic wave absorption properties

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Nano Research 2024年第3期17卷 2025-2037页

作者： Meng Yu Ying Huang Xudong Liu Kaihang She Xiaoxiao Zhao Wanqing Fan Xiaofang Ma Junhui Zou Tiehu Li MOE Key laboratory of Material Physics and Chemistry Under Extraordinary Conditions School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710129China NPU-NCP joint International Research Center on Advanced Nanomaterials&Defects Engineering State Key Laboratory of Solidification ProcessingShaanxi Engineering Laboratory for Graphene New Carbon Materials and ApplicationsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

The rational and effective combination of multicomponent materials and ingenious microstructure design for efficient electromagnetic wave(EMW)absorption are still *** this paper,MXene was used as the aerogel matrix,modified with sea urchin-like magnetic Co/N-doped carbon@polyaniline(Co-NC@PANI),gelatin was introduced as the reinforcement phase of the aerogel backbone,and a microwave absorber with high efficiency and excellent performance was successfully *** sea urchin-like Co-NC@PANI not only adjusted the impedance matching of the MXene but also introduced a magnetic loss mode into the *** multicomponent interfacial polarization,heterostructure,three-dimensional(3D)lightweight porous structure,and electromagnetic synergy strategy enabled the MXene-based aerogel modified by Co-NC@PANI(MCoP)to exhibit surprising EMW absorption *** maximum reflection loss(RL_(max))of the aerogel composite reached-62.4 dB,and the effective absorption bandwidth(EAB)reached 6.56 GHz when the loading was only 12%.In addition,through electromagnetic simulation experiments,the change in the electromagnetic field before and after EMW passed through the materials and the distribution of the volume loss density of EMW by the coaxial ring were *** coordinated electromagnetic balance strategy in the 3D network provides inspiration for the construction of materials and expands the research direction of lightweight and outstanding microwave absorbers.

关键词： MXene sea urchin-like Co/N-doped carbon@polyaniline(Co-NC@PANI) aerogel electromagnetic synergy strategy electromagnetic wave absorption

High Curie temperature and perfect spin filtering effect in a single layer Ga_(2)O_(3)magnetic tunnel junction

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Science China Materials 2024年第10期67卷 3262-3271页

作者： Zihan Zhang Xinchen Ji Jing Ning Dong Wang Yue Hao Jincheng Zhang The State Key Discipline laboratory of Wide Band Gap Semiconductor Technology Xidian UniversityXi’an 710071China shaanxi joint Key laboratory of graphene Xidian UniversityXi’an 710071China Xidian-Wuhu Research Institute Wuhu 241000China

The electronic structure and magnetic properties of single layer Ga_(2)O_(3)in the presence of Ga and O vacancies are studied by first principles method based on density functional *** results show that the introduction of Ga vacancy(VGa)leads to a non-zero magnetic moment in singlelayer two-dimensional(2D)Ga_(2)O_(3),while VO does *** find that Ga vacancies in two different symmetric positions can lead to spin polarized ground ***,when the VGa ratio is greater than 1/16(indicating one Ga vacancy per 16 Ga atoms),single-layer 2D Ga_(2)O_(3)exhibits semi-metallic properties and its spin polarization reaches 100%at the Fermi *** of these two Ga vacancy systems also indicate a potential long-range ferromagnetic order at a high Curie temperature(355.8 K).Finally,a single layer 2D Ga_(2)O_(3)with high GaI vacancy(VGaI)ratio can be used as the ferromagnetic layer to obtain the magnetic tunnel junction(MTJ)with high spin filtering effect at the Fermi *** vacant Ga_(2)O_(3)/MgO/Ga vacant Ga_(2)O_(3)MTJ exhibits excellent spin-filtering effect(with 100%spin polarization)and a giant tunneling magneto resistance(TMR)ratio(up to 1.12×10^(3)%).The results of this paper show that the MTJ based on two-dimensional Ga_(2)O_(3)with room temperature ferromagnetism exhibits reliable performance,showing the possibility of potential applications in spintronics.

关键词： two-dimensional Ga_(2)O_(3) spin electronics room temperature ferromagnetism MTJ

Engineering catalytic defects via molecular imprinting for high energy Li-S pouch cells

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National Science Review 2024年第7期11卷 239-251页

作者： Yufei Zhao Chuannan Geng Li Wang Yun Cao Haotian Yang Linkai Peng Xin Jiang Yong Guo Xiaolin Ye Wei Lv Quan-Hong Yang Shenzhen Geim graphene Center Engineering Laboratory for Functionalized Carbon Materials Tsinghua Shenzhen International Graduate School Tsinghua University Nanoyang Group Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy StorageSchool of Chemical Engineering and Technology and Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin University joint School of National University of Singapore and Tianjin University International Campus of Tianjin University

Heterogeneous catalysis promises to accelerate sulfur-involved conversion reactions in lithium-sulfur batteries. Solid-state Li2S dissociation remains as the rate-limiting step because of the weakly matched solid-solid electrocatalysis interfaces. We propose an electrochemically molecular-imprinting strategy to have a metal sulfide（MS） catalyst with imprinted defects in positions from which the pre-implanted Li2S has been electrochemically removed. Such tailor-made defects enable the catalyst to bind exclusively to Li atoms in Li2S reactant and elongate the Li–S bond, thus decreasing the reaction energy barrier during charging. The imprinted Ni3S2catalyst shows the best activity due to the highest defect concentration among the MS catalysts examined. The Li2S oxidation potential is substantially reduced to 2.34 V from 2.96 V for the counterpart free of imprinted vacancies, and an Ah-level pouch cell is realized with excellent cycling performance. With a lean electrolyte/sulfur ratio of 1.80 μL mgS–1, the cell achieves a benchmarkedly high energy density beyond 500 Wh kg–1.

关键词： lithium-sulfur battery catalysts defects energy density metal sulfide